TY  - CHAP
A1  - Butenweg, Christoph
A1  - Marinkovic, Marko
T1  - Damage reduction system for masonry infill walls under seismic loading
T2  - ce/papers
N2  - Reinforced concrete (RC) frames with masonry infills are frequently used in seismic regions all over the world. Generally masonry infills are considered as nonstructural elements and thus are typically neglected in the design process. However, the observations made after strong earthquakes have shown that masonry infills can modify the dynamic behavior of the structure significantly. The consequences were total collapses of buildings and loss of human lives. This paper presents the new system INODIS (Innovative Decoupled Infill System) developed within the European research project INSYSME (Innovative Systems for Earthquake Resistant Masonry Enclosures in RC Buildings). INODIS decouples the frame and the masonry infill by means of special U-shaped rubbers placed in between frame and infill. The effectiveness of the system was investigated by means of full scale tests on RC frames with masonry infills subjected to in-plane and out-of-plane loading. Furthermore small specimen tests were conducted to determine material characteristics of the components and the resistances of the connections. Finally, a micromodel was developed to simulate the in-plane behavior of RC frames infilled with AAC blocks with and without installation of the INODIS system.
KW  - earthquakes
KW  - in-plane and out-of-plane failure
KW  - INODIS
KW  - RC frames
Y1  - 2018
U6  - http://dx.doi.org/10.1002/cepa.863
N1  - Special Issue: ICAAC ‐ 6th International Conference on Autoclaved Aerated Concrete
VL  - 2
IS  - 4
SP  - 267
EP  - 273
PB  - Ernst & Sohn Verlag
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Marinković, Marko
A1  - Butenweg, Christoph
T1  - Out-of-plane behavior of decoupled masonry infills under seismic loading
T2  - 17th World Conference on Earthquake Engineering, Sendai, Japan, September 27 to October 2, 2021.
N2  - 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.
KW  - in-plane
KW  - out-of-plane
KW  - INODIS
KW  - earthquake
KW  - connection detail
Y1  - 2020
N1  - Die Konferenz war ursprünglich für den 13-18 September 2020 angesetzt.
ER  -