Study of Two Dimensional Shaking Table Experiment on Retrofit of School Buildings by Augmented Partition Brick Walls with Composite Column
|Keywords:||耐震補強；複合住；鋼筋混凝土；校舍；隔間磚牆；振動台試驗;seismic retrofit；composite column；reinforced concrete；school buildings；partition brick wall；shaking table test||Issue Date:||2008||Abstract:||
1999年集集大地震造成台灣中小學校舍嚴重損毀，因此校舍之耐震評估與補強的工作刻不容緩，故而提出於隔間磚牆增設複合柱補強之工法。增設之複合柱分為兩部分，配以橫向鋼筋，於兩側夾住隔間磚牆。增設之複合柱除對校舍耐震容量有所貢獻外，並可降低隔間磚牆之有效寬度，同時增加隔間磚牆之面外強度及承載能力。隔間磚牆增設複合柱之補強工程不必拆除門窗，因而省工、省時、省錢又環保，且對原有校舍功能之衝擊可降至最低。在靜力作用下之複合柱的補強效益，已透過實驗室之反復載重試驗與校舍現地之單向推垮試驗加以驗證。研究接續之前試驗，於國家地震工程研究中心進行校舍隔間磚牆增設複合柱之振動台試驗，以探討結構增設複合柱之動態反應及補強效果。振動台試驗共有四座試體，皆為單層雙向各一跨含樓板之足尺寸鋼筋混凝土構架，分別為鋼筋混凝土空構架、鋼筋混凝土構架內填先砌式1B磚牆、鋼筋混凝土構架內填先砌式1B磚牆震後增設複合柱修復及鋼筋混凝土構架內填後砌式1B磚牆震前增設複合柱補強。此外，使用初步評估、斷面分析、簡易推垮分析、ETABS非線性推垮分析及容量震譜法之耐震評估方法，評估校舍隔間磚牆增設複合柱補強之耐震能力。合柱於震後修復提供基底剪力約為141.9 kN，震後修復構架之最大基底剪力與標準構架相當；複合柱於震前補強提供基底剪力約為76.5 kN，震前補強構架之最大基底剪力為標準構架1.33倍。經由振動台試驗及耐震評估之結果，進一步確認複合柱之補強效益，故於校舍隔間磚牆增設複合柱是一簡單、經濟且有效之補強方式。
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.
|Appears in Collections:||土木工程學系|
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