Study of Two Dimensional Shaking Table Experiment on Retrofit of School Buildings by Augmented Partition Brick Walls with Composite Column
Date Issued
2008
Date
2008
Author(s)
Chang, Yen-Wei
Abstract
Thousands of buildings were damaged by the devastating 921 Chi-Chi earthquake. School buildings are the most vulnerable category in public buildings and the retrofit of existing school buildings becomes a stringent issue. Therefore, the retrofit of school buildings by adding composite columns onto the partition brick walls was proposed. The said column was divided into two parts and was added to the two sides of the partition brick wall. The two parts were integrated together with stirrups penetrating through the wall. The composite column itself contributed to the seismic capacity of the school building. Moreover, the gravity-bearing capacity of the partition brick wall was enhanced since the effective width of the partition brick wall was reduced in the presence of composite column. For the retrofit onto the partition brick walls, no windows or doors along the corridor have to be removed so that the proposed method is cost effective and the impact on the functions of the buildings is minimized. The proposed method has been successfully verified statically and experimentally through cyclic loading tests and in situ monotonic pushover tests.n this paper, the proposed method was verified dynamically and experimentally through shaking table tests. Four full-scale one-story reinforced concrete models with single span in both directions were designed and fabricated. The first model was a pure frame. As a bench mark model, the second model was a pure frame with two pre-layered brick walls. After the bench mark model was damaged after shaking table tests, it was repaired by augmenting composite column onto a brick wall and assigned as the third model. The fourth model was a retrofitted one. It was a pure frame with a post-layered brick wall. Before shaking table tests, it was retrofitted by augmenting a composite column onto the brick wall. In addition to shaking table tests, the seismic performance of the four models was assessed by preliminary evaluation, sectional analysis, simplified nonlinear pushover, ETABS nonlinear pushover and capacity spectrum method.ccording to the experimental results, the maximum base shear of the model with seismic repair was recovered from the damage to 100% of that of the bench mark model. The maximum base shear of the model with seismic retrofit was 133% of that of the bench mark model. The feasibility of the proposed retrofit method was successfully verified through shaking table tests and seismic evaluation methods. The proposed retrofit method is simple and cost effective to upgrade the seismic performance of school buildings with limited resources.
Subjects
seismic retrofit；composite column；reinforced concrete；school buildings；partition brick wall；shaking table test
Type
thesis
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