鋼筋混凝土牆剪力破壞之倒塌位移研究

Abstract

鋼筋混凝土剪力牆為結構抗倒塌破壞之關鍵構材，故有了解其行為的必要性。由於目前國內外既有之剪力牆倒塌實驗數據並不多，且其測試布置多以單曲率變形為主，為探討影響剪力牆崩塌位移行為之可能因素，本研究共設計八座低矮型未開孔剪力牆試體，改變參數為試體的作用軸壓與水平鋼筋量，進行雙曲率布置、反覆載重試驗。 除了進行實驗外，本研究亦收集國內外之剪力牆相關實驗結果，使用美國ASCE/SEI 41-17 (ASCE 2017)規範與曹君婕(2018)之建議方法，對剪力牆倒塌點位移進行預測與比較。透過觀察實驗與分析結果，提出一套針對不同變形方式之剪力牆倒塌點位移預測的建議方法，此分析模型可適時反應單雙曲率變形對試體倒塌點位移之影響，亦綜合考量試體作用軸壓、垂直主筋量與水平鋼筋量，對倒塌點位移做良好預測。

The reinforced concrete shear wall is the key member against collapse and damage of a structure. Thus, it is necessary to understand its behavior. Because there are only few experimental data available on the collapse test of shear wall, and most testing layouts were based on single-curvature bending test. In order to investigate the influential parameters of shear wall during collapse, 8 low-rise shear walls without openings were tested in this study, along with the varied parameters of the axial load and the horizontal shear reinforcement. Tests were carried out using reversed cyclic testing with a double-curvature bending layout. In addition to experimental study, available experimental results, relevant to shear wall, were collected. By using the ASCE/SE1 41-17 specification (ASCE 2017) and the proposed method by Tsao (2018), this study proposed a method to predict the displacement of the shear wall at collapse point. The proposed model could reasonably reflect the influence of either single or double-curvature bending effect on the collapse displacement of shear wall. Moreover, it comprehensively takes into the account of the acting axial load, the amount of vertical primary steel bars and the amount of horizontal steel bars, to make a reasonable prediction on the collapse displacement of shear wall.