TY  - CHAP
A1  - Gömmel, A.
A1  - Butenweg, Christoph
A1  - Kob, M.
T1  - A fluid-structure interaction model of vocal fold oscillation
T2  - 5th International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications, MAVEBA 2007
N2  - Since fluid-structure interaction within the finite-element method is state of the art in many engineering fields, this method is used in voice analysis. A quasi two-dimensional model of the vocal folds including the ventricular folds is presented. First results of self-sustained vocal fold oscillation are presented and possibilities as well as limitations are discussed.
KW  - finite element method
KW  - fluid structure interaction
KW  - vocal fold oscillation
Y1  - 2007
SN  - 978-888453674-7
N1  - 5th International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications, MAVEBA 2007; Florence; Italy; 13 December 2007 through 15 December 2007
SP  - 127
EP  - 128
ER  - 
TY  - JOUR
A1  - Baumgartner, Werner
A1  - Fidler, Florian
A1  - Weth, Agnes
A1  - Habbecke, Martin
A1  - Jakob, Peter
A1  - Butenweg, Christoph
A1  - Böhme, Wolfgang
T1  - Investigating the locomotion of the sandfish in desert sand using NMR-Imaging
JF  - PLOS ONE
N2  - The sandfish (Scincus scincus) is a lizard having the remarkable ability to move through desert sand for significant distances. It is well adapted to living in loose sand by virtue of a combination of morphological and behavioural specializations. We investigated the bodyform of the sandfish using 3D-laserscanning and explored its locomotion in loose desert sand using fast nuclear magnetic resonance (NMR) imaging. The sandfish exhibits an in-plane meandering motion with a frequency of about 3 Hz and an amplitude of about half its body length accompanied by swimming-like (or trotting) movements of its limbs. No torsion of the body was observed, a movement required for a digging-behaviour. Simple calculations based on the Janssen model for granular material related to our findings on bodyform and locomotor behaviour render a local decompaction of the sand surrounding the moving sandfish very likely. Thus the sand locally behaves as a viscous fluid and not as a solid material. In this fluidised sand the sandfish is able to “swim” using its limbs.
KW  - magnetic resonance imaging
KW  - body limbs
KW  - swimming
KW  - lizards
KW  - deserts
Y1  - 2008
U6  - http://dx.doi.org/10.1371/journal.pone.0003309
SN  - 1932-6203
VL  - 3
IS  - 10
PB  - Plos
CY  - San Francisco, California, US
ER  - 
TY  - JOUR
A1  - Frauenrath, Tobias
A1  - Hezel, Fabian
A1  - Heinrichs, Uwe
A1  - Kozerke, Sebastian
A1  - Utting, Jane
A1  - Kob, Malte
A1  - Butenweg, Christoph
A1  - Boesiger, Peter
A1  - Niendorf, Thoralf
T1  - Feasibility of Cardiac Gating Free of Interference With Electro-Magnetic Fields at 1.5 Tesla, 3.0 Tesla and 7.0 Tesla Using an MR-Stethoscope
JF  - Investigative Radiology
KW  - phonocardiogram
KW  - electrocardiogram
KW  - cardiac gating
KW  - high field MR imaging
KW  - cardiovascular MR imaging
Y1  - 2009
U6  - http://dx.doi.org/10.1097/RLI.0b013e3181b4c15e
SN  - 1536-0210 (online)
SN  - 0020-9996 (gedruckt)
VL  - 44
IS  - 9
SP  - 539
EP  - 547
PB  - Lippincott Williams & Wilkins ; (via Ovid)
CY  - Philadelphia, Pa
ER  - 
TY  - JOUR
A1  - Becker, Meike
A1  - Frauenrath, Tobias
A1  - Hezel, Fabian
A1  - Krombach, Gabriele A.
A1  - Kremer, Ute
A1  - Koppers, Benedikt
A1  - Butenweg, Christoph
A1  - Goemmel, Andreas
A1  - Utting, Jane F.
A1  - Schulz-Menger, Jeanette
A1  - Niendorf, Thoralf
T1  - Comparison of left ventricular function assessment using phonocardiogram- and electrocardiogram-triggered 2D SSFP CINE MR imaging at 1.5 T and 3.0 T
JF  - European Radiology
N2  - Objective: As high-field cardiac MRI (CMR) becomes more widespread the propensity of ECG to interference from electromagnetic fields (EMF) and to magneto-hydrodynamic (MHD) effects increases and with it the motivation for a CMR triggering alternative. This study explores the suitability of acoustic cardiac triggering (ACT) for left ventricular (LV) function assessment in healthy subjects (n=14). Methods: Quantitative analysis of 2D CINE steady-state free precession (SSFP) images was conducted to compare ACT’s performance with vector ECG (VCG). Endocardial border sharpness (EBS) was examined paralleled by quantitative LV function assessment. Results: Unlike VCG, ACT provided signal traces free of interference from EMF or MHD effects. In the case of correct Rwave recognition, VCG-triggered 2D CINE SSFP was immune to cardiac motion effects—even at 3.0 T. However, VCG-triggered 2D SSFP CINE imaging was prone to cardiac motion and EBS degradation if R-wave misregistration occurred. ACT-triggered acquisitions yielded LV parameters (end-diastolic volume (EDV), endsystolic volume (ESV), stroke volume (SV), ejection fraction (EF) and left ventricular mass (LVM)) comparable with those derived fromVCG-triggered acquisitions (1.5 T: ESVVCG=(56± 17) ml, EDVVCG=(151±32)ml, LVMVCG=(97±27) g, SVVCG=(94± 19)ml, EFVCG=(63±5)% cf. ESVACT= (56±18) ml, EDVACT=(147±36) ml, LVMACT=(102±29) g, SVACT=(91± 22) ml, EFACT=(62±6)%; 3.0 T: ESVVCG=(55±21) ml, EDVVCG=(151±32) ml, LVMVCG=(101±27) g, SVVCG=(96±15) ml, EFVCG=(65±7)% cf. ESVACT=(54±20) ml, EDVACT=(146±35) ml, LVMACT= (101±30) g, SVACT=(92±17) ml, EFACT=(64±6)%). Conclusions: ACT’s intrinsic insensitivity to interference from electromagnetic fields renders
KW  - Magnetic resonance imaging (MRI)
KW  - MR-stethoscope
KW  - Magnetic field strength
KW  - Left ventriular function
KW  - Cardiovascular MRI
Y1  - 2010
U6  - http://dx.doi.org/10.1007/s00330-009-1676-z
SN  - 1432-1084 (Onlineausgabe)
SN  - 0938-7994 (Druckausgabe)
VL  - 20
SP  - 1344
EP  - 1355
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Butenweg, Christoph
A1  - Heuer, R.
A1  - Wenk, T.
T1  - Erdbebeningenieurwesen und Baudynamik
T1  - Earthquake engineering and structural dynamics (editorial)
JF  - Bauingenieur
Y1  - 2015
SN  - 00056650
VL  - 90
IS  - 10
SP  - S1
PB  - VDI Fachmedien
CY  - Düsseldorf
ER  - 
TY  - CHAP
A1  - Lu, S.
A1  - Beyer, K.
A1  - Bosiljkov, V.
A1  - Butenweg, Christoph
A1  - D’Ayala, D.
A1  - Degee, H.
A1  - Gams, M.
A1  - Klouda, J.
A1  - Lagomarsino, S.
A1  - Penna, A.
A1  - Mojsilovic, N.
A1  - da Porto, F.
A1  - Sorrentino, L.
A1  - Vintzileou, E.
ED  - Modena, Claudio
ED  - da Porto, F.
ED  - Valluzzi, M.R.
T1  - Next generation of Eurocode 8, masonry chapter
T2  - Brick and Block Masonry Proceedings of the 16th International Brick and Block Masonry Conference, Padova, Italy, 26-30 June 2016
N2  - This paper describes the procedure on the evaluation of the masonry chapter for the next generation of Eurocode 8, the European Standard for earthquake-resistant design. In CEN, TC 250/SC8, working group WG 1 has been established to support the subcommittee on the topic of masonry on both design of new structures (EN1998-1) and assessment of existing structures (EN1998-3). The aim is to elaborate suggestions for amendments which fit the current state of the art in masonry and earthquake-resistant design. Focus will be on modelling, simplified methods, linear-analysis (q-values, overstrength-values), nonlinear procedures, out-of-plane design as well as on clearer definition of limit states. Beside these, topics related to general material properties, reinforced masonry, confined masonry, mixed structures and non-structural infills will be covered too. This paper presents the preliminary work and results up to the submission date.
Y1  - 2016
SN  - 978-1-138-02999-6 (Print)
SN  - 9781315374963 (E-Book)
SP  - 695
EP  - 700
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Giresini, Linda
A1  - Sassu, Mauro
A1  - Butenweg, Christoph
A1  - Alecci, Valerio
A1  - De Stefano, Mario
T1  - Vault macro-element with equivalent trusses in global seismic analyses
JF  - Earthquakes and Structures
N2  - This paper proposes a quick and simplified method to describe masonry vaults in global seismic analyses of buildings. An equivalent macro-element constituted by a set of six trusses, two for each transverse, longitudinal and diagonal direction, is introduced. The equivalent trusses, whose stiffness is calculated by fully modeled vaults of different geometry, mechanical properties and boundary conditions, simulate the vault in both global analysis and local analysis, such as kinematic or rocking approaches. A parametric study was carried out to investigate the influence of geometrical characteristics and mechanical features on the equivalent stiffness values. The method was numerically validated by performing modal and transient analysis on a three naves-church in the elastic range. Vibration modes and displacement time-histories were compared showing satisfying agreement between the complete and the simplified models. This procedure is particularly useful in engineering practice because it allows to assess, in a simplified way, the effectiveness of strengthening interventions for reducing horizontal relative displacements between vault supports.
KW  - vault
KW  - macro-element
KW  - equivalent stiffness
KW  - truss
KW  - churches
Y1  - 2017
U6  - http://dx.doi.org/10.12989/eas.2017.12.4.409
SN  - 2092-7614 (Print)
SN  - 2092-7622 (Online)
VL  - 12
IS  - 4
SP  - 409
EP  - 423
PB  - Techno-Press
CY  - Taejŏn
ER  - 
TY  - JOUR
A1  - Marinkovic, Marko
A1  - Butenweg, Christoph
T1  - Numerical analysis of the in-plane behaviour of decoupled masonry infilled RC frames
JF  - Engineering Structures
N2  - 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.
KW  - Seismic loading
KW  - Earthquake
KW  - In-plane performance, isolation
KW  - Infill wall design
KW  - Numerical modelling
Y1  - 2022
U6  - http://dx.doi.org/10.1016/j.engstruct.2022.114959
SN  - 0141-0296
VL  - 272
IS  - 1
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Gömmel, Andreas
A1  - Frauenrath, Tobias
A1  - Otten, Mario
A1  - Niendorf, Thoralf
A1  - Butenweg, Christoph
ED  - Möser, Michael
ED  - Schulte-Fortkamp, Brgitte
ED  - Ochmann, Martin
T1  - In-vivo measurements of vocal fold geometry using Magnetic Resonance Imaging
T2  - Fortschritte der Akustik - DAGA 2010 36. Jahrestagung für Akustik, 15. bis 18. März 2010 in Berlin
Y1  - 2010
SN  - 978-3-9808659-8-2
PB  - Deutsche Gesellschaft für Akustik
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
A1  - Marinković, Marko
A1  - Pavese, Alberto
A1  - Lanese, Igor
A1  - Hoffmeister, Benno
A1  - Pinkawa, Marius
A1  - Vulcu, Mihai-Cristian
A1  - Bursi, Oreste
A1  - Nardin, Chiara
A1  - Paolacci, Fabrizio
A1  - Quinci, Gianluca
A1  - Fragiadakis, Michalis
A1  - Weber, Felix
A1  - Huber, Peter
A1  - Renault, Philippe
A1  - Gündel, Max
A1  - Dyke, Shirley
A1  - Ciucci, M.
A1  - Marino, A.
T1  - Seismic performance of multi-component systems in special risk industrial facilities
T2  - 17. World Conference on Earthquake Engineering , Sendai , Japan , 17WCEE , 2021-09-27 - 2021-10-02
N2  - Past earthquakes demonstrated the high vulnerability of industrial facilities equipped with complex process technologies leading to serious damage of the process equipment and multiple and simultaneous release of hazardous substances in industrial facilities. Nevertheless, the design of industrial plants is inadequately described in recent codes and guidelines, as they do not consider the dynamic interaction between the structure and the installations and thus the effect of seismic response of the installations on the response of the structure and vice versa. The current code-based approach for the seismic design of industrial facilities is considered not enough for ensure proper safety conditions against exceptional event entailing loss of content and related consequences. Accordingly, SPIF project (Seismic Performance of Multi- Component Systems in Special Risk Industrial Facilities) was proposed within the framework of the European H2020 - SERA funding scheme (Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe). The objective of the SPIF project is the investigation of the seismic behavior of a representative industrial structure equipped with complex process technology by means of shaking table tests. The test structure is a three-story moment resisting steel frame with vertical and horizontal vessels and cabinets, arranged on the three levels and connected by pipes. The dynamic behavior of the test structure and installations is investigated with and without base isolation. Furthermore, both firmly anchored and isolated components are taken into account to compare their dynamic behavior and interactions with each other. Artificial and synthetic ground motions are applied to study the seismic response at different PGA levels. After each test, dynamic identification measurements are carried out to characterize the system condition. The contribution presents the numerical simulations to calibrate the tests on the prototype, the experimental setup of the investigated structure and installations, selected measurement data and finally describes preliminary experimental results.
KW  - industrial facilities
KW  - piping
KW  - installations
KW  - seismic loading
KW  - earthquakes
Y1  - 2021
ER  -