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

Maidiawati Maidiawati ,Yulia Hayati,Jafril Tanjung,Hamdeni Medriosa

doi:10.1051/matecconf/201821501036

Maidiawati Maidiawati , Yulia Hayati + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201821501036

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Abstract

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

Highlights

Brick masonry walls are very commonly used as partition in reinforced concrete (RC) buildings around the world, including in Indonesia as one of the high seismicity regions
The current study experimentally investigated the seismic behavior RC frame installed with brick infill having single and multi-window openings under cyclic lateral loading
This paper reported the seismic responses of RC frames with a central opening infill and RC frame with two openings infill under the cyclic lateral loading tests which were compared to seismic responses of the solid infilled frame and the RC bare frame

Summary

Introduction

Brick masonry walls are very commonly used as partition in reinforced concrete (RC) buildings around the world, including in Indonesia as one of the high seismicity regions. Large numbers of studies related to evaluating the brick masonry wall contribution on seismic performance of RC frames have been carried out (Choi et al, 2017; Maidiawati et al, 2011; Tanjung and Maidiawati, 2017; Zovkic et al, 2012; Dautaj et al, 2018) They mainly studied seismic behavior and performance of frames with solid masonry infill. An analytical model of infilled frame was developed and applied to calculate the seismic performance of RC building by considering the brick masonry infill as clearly stated in Reference (Maidiawati and Sanada, 2017) These studies neglected the brick infills with openings by assuming that the infills with openings did not contribute to the seismic performance of frame structure (Choi et al, 2005). The structure responses of failure modes, lateral strength, stiffness, and energy dissipation are discussed in this paper

Experimental specimens

Material properties

Test method

Failure process

Findings

Conclusions