In-Plane Loading Tests and a Retrofitting Technique for Masonry Infill Panels in RC Frames with Eccentric Openings

Yi Hsuan Tu, I. Ting Tung, Tsung Chih Chiou

研究成果: Article同行評審

摘要

The use of masonry infills in reinforced concrete (RC)-framed structures implicates the strength of the frame and the seismic resistance of the building. The present study (1) experimentally investigated the behavior of masonry infill panels surrounded by RC frames with eccentric door openings, (2) proposed and evaluated a retrofitting method based on the experimental results, and (3) introduced an analytical masonry infill model that is currently used in seismic assessment for RC buildings in Taiwan. This study's retrofitting method centers on improving the confinement at the opening edge only instead of reinforcing the panel itself. Compared with existing methods, this method entails a lower retrofitting cost because a smaller area needs to be retrofitted. In experiments, the method notably improved the lateral resistance, where retrofitting yielded a 68% and 120% increase in strength in the push and pull directions, respectively. The confinement provided by the retrofit elements (1) allowed the damage on the panel to develop gradually; and (2) maintained the integrity of the panel during the test. Consequently, the drift at maximum strength significantly increased, and the panel could provide higher residual strength after a peak in strength. Although the deformation capacity was not improved because the retrofitting method did not alter the behavior of the columns, retrofitting yielded better energy dissipation due to a higher residual strength. Furthermore, the analytical masonry infill model generally agreed with the experimental data, although the displacements where the maximum strength occurred were underestimated and overestimated in the specimens with and without retrofitting, respectively.

原文English
文章編號04022183
期刊Journal of Structural Engineering (United States)
148
發行號11
DOIs
出版狀態Published - 2022 11月 1

All Science Journal Classification (ASJC) codes

  • 土木與結構工程
  • 建築與營造
  • 一般材料科學
  • 材料力學
  • 機械工業

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