Refine
Year of publication
Institute
- Fachbereich Energietechnik (1116) (remove)
Language
- English (589)
- German (524)
- Multiple languages (1)
- Dutch (1)
- Spanish (1)
Document Type
- Article (609)
- Conference Proceeding (259)
- Book (126)
- Part of a Book (84)
- Doctoral Thesis (10)
- Conference: Meeting Abstract (7)
- Report (7)
- Other (4)
- Talk (3)
- Diploma Thesis (2)
Keywords
- Blitzschutz (18)
- Lightning protection (11)
- Earthquake (5)
- Diversity Management (4)
- Energy storage (4)
- Power plants (4)
- Risikomanagement (4)
- Seismic design (4)
- reinforced concrete (4)
- Associated liquids (3)
- Concentrated solar power (3)
- Elektromagnetischer Schutzschild (3)
- Hybrid energy system (3)
- INODIS (3)
- Lightning (3)
- Out-of-plane load (3)
- Risikoabschätzung (3)
- Risk management (3)
- Seismic loading (3)
- Stahlbetonkonstruktion (3)
- earthquakes (3)
- renewable energy (3)
- Adjacent buildings (2)
- Central receiver power plant (2)
- Concentrated systems (2)
- Direkter Blitzschlag (2)
- Diversity (2)
- Electricity generation (2)
- Energierecht (2)
- Engineering Habitus (2)
- Erneuerbare Energien (2)
- Gas turbine (2)
- Gasturbine (2)
- Historical centres (2)
- Human-robot collaboration (2)
- Hybridsystem (2)
- INSYSME (2)
- Induzierte Spannungen (2)
- Innovation Management (2)
- Lightning Protection (2)
- Lightning protection system (2)
- Magnetische Felder (2)
- Masonry infill (2)
- Micro turbine (2)
- Mikrogasturbine (2)
- Organizational Culture (2)
- Regenerative Energieanlagen (2)
- Renewable energy (2)
- Risikoabwägung (2)
- Risk assessment (2)
- Shake table test (2)
- Solar thermal technologies (2)
- Stone masonry (2)
- Tanks (2)
- cyber physical production system (2)
- digital shadow (2)
- electromagnetic shielding (2)
- engineering education (2)
- hybrid system (2)
- industrial facilities (2)
- installations (2)
- lightning protection (2)
- photovoltaic system (2)
- piping (2)
- seismic design (2)
- seismic loading (2)
- wind turbine (2)
- Academia (1)
- Acceptance (1)
- Algal Turf Scrubber (1)
- Algal–bacterial bioflm (1)
- Alternative Energiequelle (1)
- Anti-Bias (1)
- Antibias (1)
- Artificial intelligence (1)
- Ausfachungsmauerwerk (1)
- BIM (1)
- Basisisolierung (1)
- Bauwerksüberwachung (1)
- Behaviour factor q (1)
- Bemessung (1)
- Best practice sharing (1)
- Biogas (1)
- Blind prediction competition (1)
- Blitz (1)
- Blitzeinschlag (1)
- Blitzrisiko (1)
- Blitzschlag (1)
- Bloom Taxonomy (1)
- COMSOL Multiphysics (1)
- Camera system (1)
- Capacity Curve (1)
- Cardiovascular MRI (1)
- Central receiver system (1)
- Ceramics (1)
- Change Management (1)
- Change management (1)
- Circular bioeconomy (1)
- Civil engineering (1)
- Cloud passages (1)
- Cognitive assistance system (1)
- Components (1)
- Concentrated solar collector (1)
- Concentrating solar power (1)
- Control optimization (1)
- Corporate Culture (1)
- DAC (1)
- DIN EN 1996 (1)
- DNI forecast (1)
- DNI forecasting (1)
- Decision theory (1)
- Decoupling (1)
- Design Thinking (1)
- Design examples (1)
- Digital leadership (1)
- Digitalization (1)
- Direct lightning strike (1)
- Direct normal irradiance forecast (1)
- District data model (1)
- District energy planning platform (1)
- Diversity management (1)
- Dynamic simulation (1)
- EN 1998-4 (1)
- ESHM20, industrial facilities (1)
- Earthquake Engineering (1)
- Electrochemistry (1)
- Elektrizität (1)
- Elektromagnetische Kopplung (1)
- Emilia-Romagna earthquake (1)
- Emissionshandel (1)
- Emissionsrechtehandel (1)
- Empirical consequence curves (1)
- Empirical fragility functions (1)
- Energiekonzept (1)
- Energietechnik (1)
- Energietechnische Anlage (1)
- Energy (1)
- Energy Systems (1)
- Energy system (1)
- Energy system planning (1)
- Engineering (1)
- Engineering Education (1)
- Erdbeben (1)
- Erdbebeneinwirkung (1)
- Erneuerbares Energiengesetz (1)
- Ethics (1)
- Eurocode 8 (1)
- Fernerkundung (1)
- Feuchtigkeit (1)
- Fracture classification (1)
- Frame structure (1)
- Fresnel power plant (1)
- Future Skills (1)
- Future skills (1)
- Gas (1)
- Gender (1)
- Genetic algorithm (1)
- Germany (1)
- Gesamtwassergehalt (1)
- Global change (1)
- Gust wind response (1)
- Heliostat Field Calibration (1)
- Heliostats (1)
- Higher Education (1)
- Hilbert Room (1)
- Human factors (1)
- Human-centered work design (1)
- Hybridanlage (1)
- Hybridization (1)
- Imaging (1)
- In- plane damage (1)
- In-plane (1)
- In-plane load (1)
- In-plane performance, isolation (1)
- Inclusive work climate (1)
- Industrial facilities (1)
- Industrial units (1)
- Industrieanlagen (1)
- Infill wall design (1)
- Infrarot-Reflexions-Absorptions-Spektroskopie (1)
- Infrarotmesstechnik (1)
- Innovation (1)
- Interaction (1)
- Interculturality (1)
- Interdisciplinarity (1)
- Isolation (1)
- Kalkulation (1)
- Kernenergie (1)
- Key competences (1)
- Kraftwerke (1)
- Leadership (1)
- Left ventriular function (1)
- Lightning Risk (1)
- Linear elastic analysis (1)
- LiveLink for MATLAB (1)
- MIR-Spektroskopie (1)
- MR-stethoscope (1)
- Magnetic field strength (1)
- Magnetic resonance imaging (MRI) (1)
- Masonry partition walls (1)
- Masonry structures (1)
- Mauerwerksbauten (1)
- Mauerwerksgebäude (1)
- Maßstabsgetreues Modell (1)
- Measuring instruments (1)
- Methane (1)
- Mixed integer linear programming (MILP) (1)
- Modern constructions (1)
- Molten salt receiver (1)
- Molten salt receiver system (1)
- Molten salt receiver system, (1)
- Molten salt solar tower (1)
- Momentenverteilung (1)
- Monitoring (1)
- Monte Carlo Tree Search (1)
- Morphing (1)
- Multi-storey (1)
- Neo-Deterministic (1)
- Nowcasting (1)
- Nuclear Applications (1)
- Numerical modelling (1)
- Operators (1)
- Optimization module (1)
- Organizational culture (1)
- Out-of-plane (1)
- Out-of-plane capacity (1)
- Out-of-plane failure (1)
- Out-of-plane strength (1)
- PBEE (1)
- PTC (1)
- Parabolic trough collector (1)
- Perception (1)
- Photovoltaics (1)
- Photovoltaikanlage (1)
- Photovoltaikanlagen (1)
- Piping (1)
- Postulates (1)
- Power conversion systems (1)
- Precast buildings (1)
- Privacy (1)
- Probability distribution mapping (1)
- Process prediction (1)
- Psychological concepts (1)
- Pushover analysis (1)
- PushoverAnalysen (1)
- Pyrometrie (1)
- Quadrocopter (1)
- Quantenkaskadenlaser (1)
- Quantenmechanik (1)
- RC frames (1)
- Rahmentragwirkung (1)
- Reinforced concrete frame (1)
- Renewable energy integration (1)
- Response spectrum (1)
- Responsibility (1)
- Risiko (1)
- Risk (1)
- Risk Assessment (1)
- Risk Management (1)
- Risk assessment ; Insurance (1)
- Schrödingers cat (1)
- Seismic (1)
- Seismic Hazard (1)
- Sensor (1)
- Shoulder (1)
- Silos (1)
- Slab deflection (1)
- Social impact measurement (1)
- Solar concentration (1)
- Solar dish (1)
- Solar irradiance (1)
- Speckle (1)
- Spectral analysis (1)
- Stahlbeton (1)
- Stahlbetonrahmen (1)
- Star design (1)
- Structural design (1)
- Structural health monitoring (1)
- Sustainability (1)
- Sustainable engineering education (1)
- Tank (1)
- Temperaturmessung (1)
- Thermal Energy Storage (1)
- Time-series aggregation (1)
- Transient flux distribution (1)
- Trinitrotol (1)
- Two-phase modelling (1)
- Typical periods (1)
- UAV (1)
- Umwelt (1)
- Umweltzertifikathandel (1)
- Uncertainty analysis (1)
- Unmanned aerial vehicle (1)
- Unreinforced masonry buildings (1)
- Unreinforced masonry walls (1)
- Verdunstungskälte (1)
- Verhaltensbeiwerte (1)
- Versicherung (1)
- Virtuelle Kraftwerke (1)
- Vulnerability Curves (1)
- Wand-Decken-Interaktion (1)
- Wellenausbreitung (1)
- Wind turbulence (1)
- Windenergieanlage (1)
- Windenergieanlagen (1)
- Window opening (1)
- Ziegelmauerwerk (1)
- acoustic pyrometry (1)
- antennas (1)
- arresters (1)
- atmospheric modeling (1)
- behaviour factor q (1)
- best practice (1)
- bio-methane (1)
- body limbs (1)
- bubble column (1)
- bullying (1)
- calculations (1)
- carbon dioxide removal (1)
- cardiac gating (1)
- cardiovascular MR imaging (1)
- change management (1)
- churches (1)
- climate neutrality (1)
- concentrating collector (1)
- conductors (1)
- connection detail (1)
- current distribution (1)
- cyber-physical production system (1)
- deserts (1)
- digital twin (1)
- digitalization (1)
- direct air capture (1)
- dissemination (1)
- distribution grid simulation (1)
- diversity (1)
- diversity management (1)
- down-conductor (1)
- e-mobility (1)
- early warning and response system (1)
- earthquake (1)
- earthquake engineering (1)
- economics (1)
- education (1)
- elastomeric bearing (1)
- electrical circuits (1)
- electrical engineering (1)
- electrocardiogram (1)
- electromagnetic coupling (1)
- electromagnetic shield (1)
- energy concept (1)
- energy transition (1)
- engineering (1)
- environment (1)
- equivalent stiffness (1)
- field simulation (1)
- finite element method (1)
- flue gas components (1)
- fluid structure interaction (1)
- fragility curves (1)
- friction pendulum bearing (1)
- gender and diversity (1)
- granular silo (1)
- high field MR imaging (1)
- high-frequency technology (1)
- human digital shadow (1)
- human factors (1)
- human-machine interface (1)
- hybrid-system (1)
- hypoplasticity (1)
- impulsive effects (1)
- in-plane (1)
- in-plane and out-of-plane failure (1)
- in-plane behaviour (1)
- induced voltage (1)
- induced voltages (1)
- innovation (1)
- innovation management (1)
- integration SHM in BIM (1)
- interconnected sensor systems (1)
- internet of production (1)
- lessons learned (1)
- lightning (1)
- lightning flash (1)
- lightning strike (1)
- linear elastic analysis; (1)
- liquid storage tank (1)
- liquid-storage tank (1)
- liquid-structure interaction (1)
- lizards (1)
- macro-element (1)
- magnetic field (1)
- magnetic fields (1)
- magnetic resonance imaging (1)
- masonry infill (1)
- masonry structures (1)
- metal façade (1)
- methanation (1)
- microwave technology (1)
- modern constructions (1)
- negative emissions (1)
- nonlinear transient analyses (1)
- open educational resources (1)
- out-of-plane (1)
- out-of-plane behaviour (1)
- overvoltages (1)
- phonocardiogram (1)
- planning (1)
- plasma technology (1)
- plug flow reactor (1)
- point-focussing system (1)
- policy recommendations (1)
- power generation (1)
- power transmission lines (1)
- power-to-gas (1)
- probability distribution (1)
- protection measures (1)
- raytracing (1)
- recommendations for actions (1)
- renewable energies (1)
- research association (1)
- risk assessment (1)
- risk management (1)
- rollout (1)
- safety control (1)
- scaled model (1)
- seismic (1)
- seismic hazard (1)
- seismic isolation (1)
- seismic response (1)
- seismic risk (1)
- seismic structural damage detection via SHM (1)
- seismic vulnerability (1)
- simplified approach (1)
- smart-charging (1)
- social responsible engineering (1)
- solar process heat (1)
- standards (1)
- steam production (1)
- steel columns (1)
- storage dispatch (1)
- storage optimisation (1)
- structure-soil-structure interaction (1)
- surges (1)
- swimming (1)
- teaching (1)
- temperature measurement (1)
- thermal storage (1)
- touch voltage (1)
- truss (1)
- unreinforced masonry buildings (1)
- user & usage (1)
- vault (1)
- vocal fold oscillation (1)
- wave propagation (1)
- Überspannung (1)
Frequency Dependent Impedance Analysis of the Foundation-Soil-Systems of Onshore Wind Turbines
(2018)
In recent years, many onshore wind turbines are erected in seismic active regions and on soils with poor load bearing capacity, where pile grids are inevitable to transfer the loads into the ground. In this contribution, a realistic multi pile grid is designed to analyze the dynamics of a wind turbine tower including frequency dependent soil-structure-interaction. It turns out that different foundations on varying soil configurations heavily influence the vibration response. While the vibration amplitude is mostly attenuated, certain unfavorable combinations of structure and soil parameters lead to amplification in the range of the system's natural frequencies. This testifies the need for overall dynamic analysis in the assessment of the dynamic stability and the holistic frequency tuning of the turbines.
EU-Projekt INSYSME : innovative Systeme für erdbebentaugliche Ausfachungswände aus Ziegelmauerwerk
(2014)
Baustatik in Beispielen
(2012)
Wind loads have great impact on many engineering structures. Wind storms often cause irreparable damage to the buildings which are exposed to it. Along with the earthquakes, wind represents one of the most common environmental load on structures and is relevant for limit state design. Modern wind codes indicate calculation procedures allowing engineers to deal with structural systems, which are susceptible to conduct wind-excited oscillations. In the codes approximate formulas for wind buffeting are specified which relate the dynamic problem to rather abstract parameter functions. The complete theory behind is not visible in order to simplify the applicability of the procedures. This chapter derives the underlying basic relations of the spectral method for wind buffeting and explains the main important applications of it in order to elucidate part of the theoretical background of computations after the new codes. The stochasticity of the wind processes is addressed, and the analysis of analytical as well as measurement based power spectra is outlined. Short MATLAB codes are added to the Appendix 3 which carry out the computation of a single sided auto-spectrum from a statistically stationary, discrete stochastic process. Two examples are presented.
Digital Shadows as the aggregation, linkage and abstraction of data relating to physical objects are a central vision for the future of production. However, the majority of current research takes a technocentric approach, in which the human actors in production play a minor role. Here, the authors present an alternative anthropocentric perspective that highlights the potential and main challenges of extending the concept of Digital Shadows to humans. Following future research methodology, three prospections that illustrate use cases for Human Digital Shadows across organizational and hierarchical levels are developed: human-robot collaboration for manual work, decision support and work organization, as well as human resource management. Potentials and challenges are identified using separate SWOT analyses for the three prospections and common themes are emphasized in a concluding discussion.
The future of industrial manufacturing and production will increasingly manifest in the form of cyber-physical production systems. Here, Digital Shadows will act as mediators between the physical and digital world to model and operationalize the interactions and relationships between different entities in production systems. Until now, the associated concepts have been primarily pursued and implemented from a technocentric perspective, in which human actors play a subordinate role, if they are considered at all. This paper outlines an anthropocentric approach that explicitly considers the characteristics, behavior, and traits and states of human actors in socio-technical production systems. For this purpose, we discuss the potentials and the expected challenges and threats of creating and using Human Digital Shadows in production.
Non-nuclear and non-fossil energy resources and their possibilities for future power generation
(1975)
It must be stressed that the assessment of the exploitation possibilities of the energy resources discussed in this paper requires further studies. With this proviso, the situation can be provisionally summarised as follows: The total potential of known geothermal steam sources is only 64 GW. Geothermal energy could therefore only make a significant contribution to covering the worldwide power needs if we succeed in exploiting dry geothermal reservoirs. Exploitation of tidal energy is limited to a few geographically favourable locations. The power generation potential at these locations is only about 64 GW. An important drawback of tidal power is discontinuous power generation. Large scale exploitation of wind, wave and glacier energy, and of ocean heat, requires solution of a number of technological problems. The environmental effects of exploitation of these energy resources are to some extent of a qualitatively different nature from those of operation of fossil-fuel-fired and of nuclear power plants. The scanty knowledge in this area often results in these effects being underestimated. In any case, however, it would be deliberately misleading to postulate that any form of power generation is possible without some detrimental effects on the environment. It may be stated in conclusion that, owing to their small potential or to the as yet insufficiently advanced technological development, none of the energy resources discussed in this paper can make a significant contribution to the solution of middle-term energy supply problems, i.e., to a rapid replacement of mineral oil and natural gas.
This study analyses the expected utilization of an urban distribution grid under high penetration of photovoltaic and e-mobility with charging infrastructure on a residential level. The grid utilization and the corresponding power flow are evaluated, while varying the control strategies and photovoltaic installed capacity in different scenarios. Four scenarios are used to analyze the impact of e-mobility. The individual mobility demand is modelled based on the largest German studies on mobility “Mobilität in Deutschland”, which is carried out every 5 years. To estimate the ramp-up of photovoltaic generation, a potential analysis of the roof surfaces in the supply area is carried out via an evaluation of an open solar potential study. The photovoltaic feed-in time series is derived individually for each installed system in a resolution of 15 min. The residential consumption is estimated using historical smart meter data, which are collected in London between 2012 and 2014. For a realistic charging demand, each residential household decides daily on the state of charge if their vehicle requires to be charged. The resulting charging time series depends on the underlying behavior scenario. Market prices and mobility demand are therefore used as scenario input parameters for a utility function based on the current state of charge to model individual behavior. The aggregated electricity demand is the starting point of the power flow calculation. The evaluation is carried out for an urban region with approximately 3100 residents. The analysis shows that increased penetration of photovoltaics combined with a flexible and adaptive charging strategy can maximize PV usage and reduce the need for congestion-related intervention by the grid operator by reducing the amount of kWh charged from the grid by 30% which reduces the average price of a charged kWh by 35% to 14 ct/kWh from 21.8 ct/kWh without PV optimization. The resulting grid congestions are managed by implementing an intelligent price or control signal. The analysis took place using data from a real German grid with 10 subgrids. The entire software can be adapted for the analysis of different distribution grids and is publicly available as an open-source software library on GitHub.
The magnetic forces of fringe magnetic fields of MR systems on ferromagnetic components can impose a severe patient, occupational health and safety hazard. MRI accidents are listed as number 9 of the top 10 risks in modern medicine. With the advent of ultrahigh field MR systems including passively shielded magnet versions, this risk, commonly known as the missile or projectile effect is even more pronounced. A strategy employing magnetic field sensors which can be attached to ferromagnetic objects that are commonly used in a clinical environment is conceptually appealing for the pursuit of reducing the risk of ferromagnetic projectile accidents.
Armiranobetonske (AB) zgrade sa zidanom ispunom
se izvode u mnogim zemljama širom sveta. Iako se
zidana ispuna posmatra kao nekonstruktivni element, ona
značajno utiče na promenu dinamičkih karakteristika AB
ramovskih konstrukcija u toku zemljotresnog dejstva.
Odskora, značajan napor je utrošen na istraživanje
izolovanih ispuna, koje su odvojene od okolnog rama
obično ostavljanjem prostora između rama i ispune. U
ovom slučaju deformacija rama ne aktivira ispunu i na taj
način ispuna ne utiče na ponašanje rama. Ovaj rad
predstavlja rezultate istraživanja ponašanja AB
ramovskih zgrada sa INODIS sistemom koji izoluje ispunu
u odnosu na okolni ram. Uticaj izolovane ispune je prvo
ispitan na jednospratnim i jednobrodnim ramovima. Ovo
je iskorišćeno kao osnova za parametarsku analizu na
višespratnim i višebrodnim ramovima, kao i na primeru
zgrade. Promena krutosti i dinamičkih karakteristika je
analizirano kao i odgovor pri zemljotresnom dejstvu.
Izvršeno je poređenje sa praznom ramovskom
konstrukcijom kao i ramovima ispunjenim ispunom na
tradicionalni način. Rezultati pokazuju da je ponašanje
ramova sa izolovanom ispunom slično ponašanju praznih
ramova, dok je ponašanje ramova sa tradicionalnom
ispunom daleko drugačije i zahteva kompleksne
numeričke modele. Ovo znači da ukoliko se primeni
adekvatna konstruktivna mera izolacije ispune, proračun
ramovskim zgrada sa zidanom ispunom se može
značajno pojednostaviti.
Masonry infill walls are commonly used in reinforced concrete (RC) frame structures, also in seismically active areas, although they often experience serious damage during earthquakes. One of the main reasons for their poor behaviour is the connection to the frame, which is usually constructed using mortar. This paper describes the novel solution for infill/frame connection based on application of elastomeric material between them. The system called INODIS (Innovative Decoupled Infill System) has the aim to postpone the activation of infill in in-plane direction and at the same time to provide sufficient out-of-plane support. First, experimental tests on infilled frame specimens are presented and the comparison of the results between traditionally infilled frames and infilled frames with the INODIS system are given. The results are then used for calibration and validation of numerical model, which can be further employed for investigating the influence of some material parameters on the behaviour of infilled frames with the INODIS system.
Masonry is used in many buildings not only for load-bearing walls, but also for non-load-bearing enclosure elements in the form of infill walls. Many studies confirmed that infill walls interact with the surrounding reinforced concrete frame, thus changing dynamic characteristics of the structure. Consequently, masonry infills cannot be neglected in the design process. However, although the relevant standards contain requirements for infill walls, they do not describe how these requirements are to be met concretely. This leads in practice to the fact that the infill walls are neither dimensioned nor constructed correctly. The evidence of this fact is confirmed by the recent earthquakes, which have led to enormous damages, sometimes followed by the total collapse of buildings and loss of human lives. Recently, the increasing effort has been dedicated to the approach of decoupling of masonry infills from the frame elements by introducing the gap in between. This helps in removing the interaction between infills and frame, but raises the question of out-of-plane stability of the panel. This paper presents the results of the experimental campaign showing the out-of-plane behavior of masonry infills decoupled with the system called INODIS (Innovative decoupled infill system), developed within the European project INSYSME (Innovative Systems for Earthquake Resistant Masonry Enclosures in Reinforced Concrete Buildings). Full scale specimens were subjected to the different loading conditions and combinations of in-plane and out-of-plane loading. Out-of-plane capacity of the masonry infills with the INODIS system is compared with traditionally constructed infills, showing that INODIS system provides reliable out-of-plane connection under various loading conditions. In contrast, traditional infills performed very poor in the case of combined and simultaneously applied in-plane and out-of-plane loading, experiencing brittle behavior under small in-plane drifts followed by high out-of-plane displacements. Decoupled infills with the INODIS system have remained stable under out-of-plane loads, even after reaching high in-plane drifts and being damaged.
Because of simple construction process, high energy efficiency, significant fire resistance and excellent sound isolation, masonry infilled reinforced concrete (RC) frame structures are very popular in most of the countries in the world, as well as in seismic active areas. However, many RC frame structures with masonry infills were seriously damaged during earthquake events, as the traditional infills are generally constructed with direct contact to the RC frame which brings undesirable infill/frame interaction. This interaction leads to the activation of the equivalent diagonal strut in the infill panel, due to the RC frame deformation, and combined with seismically induced loads perpendicular to the infill panel often causes total collapses of the masonry infills and heavy damages to the RC frames. This fact was the motivation for developing different approaches for improving the behaviour of masonry infills, where infill isolation (decoupling) from the frame has been more intensively studied in the last decade. In-plane isolation of the infill wall reduces infill activation, but causes the need for additional measures to restrain out-of-plane movements. This can be provided by installing steel anchors, as proposed by some researchers. Within the framework of European research project INSYSME (Innovative Systems for Earthquake Resistant Masonry Enclosures in Reinforced Concrete Buildings) the system based on a use of elastomers for in-plane decoupling and steel anchors for out-of-plane restrain was tested. This constructive solution was tested and deeply investigated during the experimental campaign where traditional and decoupled masonry infilled RC frames with anchors were subjected to separate and combined in-plane and out-of-plane loading. Based on a detailed evaluation and comparison of the test results, the performance and effectiveness of the developed system are illustrated.
Damage of reinforced concrete (RC) frames with masonry infill walls has been observed after many earthquakes. Brittle behaviour of the masonry infills in combination with the ductile behaviour of the RC frames makes infill walls prone to damage during earthquakes. Interstory deformations lead to an interaction between the infill and the RC frame, which affects the structural response. The result of this interaction is significant damage to the infill wall and sometimes to the surrounding structural system too. In most design codes, infill walls are considered as non-structural elements and neglected in the design process, because taking into account the infills and considering the interaction between frame and infill in software packages can be complicated and impractical. A good way to avoid negative aspects arising from this behavior is to ensure no or low-interaction of the frame and infill wall, for instance by decoupling the infill from the frame. This paper presents the numerical study performed to investigate new connection system called INODIS (Innovative Decoupled Infill System) for decoupling infill walls from surrounding frame with the aim to postpone infill activation to high interstory drifts thus reducing infill/frame interaction and minimizing damage to both infills and frames. The experimental results are first used for calibration and validation of the numerical model, which is then employed for investigating the influence of the material parameters as well as infill’s and frame’s geometry on the in-plane behaviour of the infilled frames with the INODIS system. For all the investigated situations, simulation results show significant improvements in behaviour for decoupled infilled RC frames in comparison to the traditionally infilled frames.
Reinforced concrete (RC) structures with masonry infills are widely used for several types of buildings all over the world. However, it is well known that traditional masonry infills constructed with rigid contact to the surrounding RC frame performed rather poor in past earthquakes. Masonry infills showed severe in-plane damages and failed in many cases under out-of-plane seismic loading. As the undesired interactions between frames and infills changes the load transfer on building level, complete collapses of buildings were observed. A possible solution is uncoupling of masonry infills to the frame to reduce the infill contribution activated by the frame deformation under horizontal loading. The paper presents numerical simulations on RC frames equipped with the innovative decoupling system INODIS. The system was developed within the European project INSYSME and allows an effective uncoupling of frame and infill. The simulations are carried out with a micro-modelling approach, which is able to predict the complex nonlinear behaviour resulting from the different materials and their interaction. Each brick is modelled individually and connected taking into account nonlinearity of a brick mortar interface. The calibration of the model is based on small specimen tests and experimental results for one bay one storey frame are used for the validation. The validated model is further used for parametric studies on two storey and two bay infilled frames. The response and change of the structural stiffness are analysed and compared to the traditionally infilled frame. The results confirm the effectiveness of the INODIS system with less damage and relatively low contribution of the infill at high drift levels. In contrast to the uncoupled system configurations, traditionally infilled frames experienced brittle failure at rather low drift levels.