Effects of Central Opening in Masonry Infill on Lateral Behavior of Intermediate RC Frames

2019 ◽  
Vol 8 (1) ◽  
pp. 20180040 ◽  
Author(s):  
Elshan Ahani ◽  
Mir Naghi Mousavi ◽  
Behzad Rafezy ◽  
Fathollah Osmanzadeh
Keyword(s):  
Masonry Infill ◽  
Rc Frames ◽  
Central Opening ◽  
Lateral Behavior

scholarly journals Effects of Single and Multi Openings in Brick Infills on the Seismic Response of Infilled RC Frames

2018 ◽  
Vol 215 ◽  
pp. 01036
Author(s):  
Maidiawati ◽  
Jafril Tanjung ◽  
Hamdeni Medriosa ◽  
Yulia Hayati
Keyword(s):  
Seismic Response ◽  
Dissipated Energy ◽  
Rc Frame ◽  
Infilled Frames ◽  
Masonry Infill ◽  
Infilled Frame ◽  
Rc Frames ◽  
Central Opening ◽  
Lateral Strength ◽  
Infilled Rc Frames

Many researchers have performed a lot of studies of the seismic behavior reinforced concrete (RC) frame with masonry infill. They found that masonry infill affects the lateral strength, stiffness and ductility performance of the RC frame structures. However, when openings appeared in the panel infill for door and windows, the responses of the overall structure are entirely changed. The primary purpose of this study is to experimentally investigate the behavior of brick infilled RC frames possessing single opening and two openings. Four specimens of 1/4-scale single bay RC frames with brick infills were made that were one bare frame, one frame with full infill and two frames with infills having a central opening and two openings with the opening ratio of 25%. The specimens were tested under lateral reversed cyclic loads. Consequently, different responses of failure mechanism, lateral strength, stiffness and energy dissipated were observed among the specimens. The brick full infill failed in shear with propagation cracks in central part of the panel, but in the case of the infills with single and two openings, the cracks were dominated at the corners of the openings. The in-plane strength, stiffness and dissipated energy of infilled frames decreased when openings appeared in the panel. However, the seismic performance of brick infilled frame with the opening of 25% of panel area is better than those of bare frame. The brick infilled frames with a central opening and two openings are similar in lateral strength and dissipated energy. It seems that area and position of the openings control the seismic response to the overall infilled frame structure of the openings

The Effects of Amount and Location of Openings on Lateral Behavior of Masonry Infilled RC Frames

2019 ◽  
Vol 23 (5) ◽  
pp. 2175-2187
Author(s):  
Elshan Ahani ◽  
Mir Naghi Mousavi ◽  
Ali Ahani ◽  
Mohammad Kheirollahi
Keyword(s):  
Rc Frames ◽  
Infilled Rc Frames ◽  
Masonry Infilled Rc Frames ◽  
Lateral Behavior

FE modelling of RC frames with masonry infill panels under in-plane and out-of-plane loading

2013 ◽  
Vol 51 ◽  
pp. 73-87 ◽  
Author(s):  
Alireza Mohyeddin ◽  
Helen M. Goldsworthy ◽  
Emad F. Gad
Keyword(s):  
Fe Modelling ◽  
Masonry Infill ◽  
Rc Frames ◽  
Infill Panels ◽  
Out Of Plane

A Beam-and-Column Based Macro Model for Masonry Infill Walls in RC Frames under Cyclic Loading

2011 ◽  
Vol 255-260 ◽  
pp. 193-197
Author(s):  
Jia Chao Zhang ◽  
Lei Ming Zhang ◽  
Xi La Liu
Keyword(s):  
Structural Response ◽  
Seismic Action ◽  
Rc Frame ◽  
Wall Panel ◽  
Infill Walls ◽  
Masonry Infill ◽  
Macro Model ◽  
Masonry Infill Walls ◽  
Rc Frames ◽  
Proposed Model

Reinforced concrete (RC) frame with masonry infill walls is a very common structural system in low and medium rise buildings. The infill walls are usually considered as non-structural components in the design or assessment of buildings. However, many damages in earthquakes have shown that the infill walls can significantly change the structural response to seismic action. Consequently the evaluation of the seismic performance of RC frame with masonry infill walls becomes very important, and also turns to be a major challenge for structure engineers. In this paper a beam-and-column (BAC) macro model for walls is proposed to simulate the masonry infill walls in RC frames. In this model, the masonry panel is replaced by an equivalent rigid frame which is made up of some beam-and-column members. The geometric parameters of each member can be determined simply by equivalent stiffness combined with the original dimensions of wall panel. The physical characteristics are described directly by material properties of wall panel under investigation. To validate the rationality of proposed model, a masonry-infilled RC frame under cyclic reversed loading is analyzed by the proposed model. The results, including crack pattern, load versus displacement relation are then compared with the experiment response. Good agreements are found.

scholarly journals Modeling Strategies of Ductile Masonry Infills for the Reduction of the Seismic Vulnerability of RC Frames

2020 ◽  
Vol 6 ◽  
Author(s):  
Riccardo R. Milanesi ◽  
Mehdi Hemmat ◽  
Paolo Morandi ◽  
Yuri Totoev ◽  
Andrea Rossi ◽  
...  
Keyword(s):  
Seismic Vulnerability ◽  
Experimental Tests ◽  
Economic Losses ◽  
Masonry Infill ◽  
Displacement Capacity ◽  
Masonry Infills ◽  
Rc Frames ◽  
The One ◽  
The University ◽  
Sliding Joints

The threat to human lives and the economic losses due to high seismic vulnerability of non-engineered traditional masonry infills subjected to earthquakes have been highlighted by several post-seismic surveys and experimental and numerical investigations. In the past decades, researchers have proposed different techniques to mitigate problems related to the seismic vulnerability of traditional masonry infills; however, a viable, practical, and universally accepted solution has not been achieved yet. Among the possible innovative techniques, the one using ductile (or pliable) infills have shown promising results in recent experimental tests. These infills have provided, indeed, a reduced in-plane stiffness and a very high displacement capacity. The research units of the University of Pavia/EUCENTRE (Italy) and the University of Newcastle (Australia) have proposed two different systems for ductile masonry infill based on dividing the masonry panel into a number of segments interconnected through horizontal sliding joints. The ductile masonry infill proposed by the University of Pavia subdivides the masonry panel into four horizontal subpanels using specially engineered sliding joints and presents a deformable mortar at the infill/structure interface, while the one conceived by the University of Newcastle is made of mortar-less specially shaped masonry units capable of sliding on all bed joints. The experiments conducted on the two novel systems have permitted the calibration of two numerical macromodels capable to replicate the overall in-plane seismic response of these ductile masonry infills. One approach is based on a spring model, as usually adopted for traditional masonry infill; the other calibrates the response of a semi-active damper model. The calibrated macromodel approaches have been adopted to demonstrate the enhanced behavior and the reduction of the seismic vulnerability of reinforced concrete (RC) framed structures with the employment of the ductile infills in comparison to structures with non-engineered masonry infills.

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