低矮型鋼筋混凝土剪力牆之側力位移曲線預測

Lateral Load Displacement Curves of Low-Rise Reinforced Concrete Shear Walls

翁樸文(Pu-Wen Weng) ； 李翼安(Yi-An Li) ； 蔡仁傑(Ren-Jie Tsai) ； 黃世建(Shyh-Jiann Hwang)

《結構工程》 31卷1期 (2016/03) Pp. 37-60

https://doi.org/10.6849/SE.201603_31(1).0002

摘要

鋼筋混凝土剪力牆為建築中常見的構件之一，其具有高強度與高勁度之特性，在地震來臨時將承受較大之剪力，因而較其它結構構件更早發生剪力破壞。所以對鋼筋混凝土剪力牆之側力位移曲線應作了解，方能充分掌握結構耐震能力評估之準確性。本文參考國家地震工程研究中心出版之校舍結構耐震評估與補強技術手冊，採用軟化壓拉桿模型，對低矮型剪力牆承受剪力破壞之情況，提出簡化之側力位移曲線建議。本文進一步引入簡化之壓拉桿指標，且根據軟化壓拉桿模型應變場估算剪力牆之剪力變形。本文建議曲線大幅簡化繁複之計算流程，其與實驗結果比對具有合理之預測結果，且與校舍技術手冊的預測精度相當。本文建議之剪力強度預測，亦可改善ACI 318-14規範高估剪力鋼筋貢獻之問題，可合理估計構架中填充RC牆之強度。本文提供之方法除可供耐震評估用，對於新建建築之結構設計，亦可協助工程師估計RC隔間牆之剪力強度貢獻，進而有效評估填充RC牆對構架耐震行為之影響。

關鍵字

鋼筋混凝土 ； 剪力牆 ； 側力位移曲線 ； 剪力強度 ； 剪力變形 ； 低矮型

並列摘要

Reinforced concrete shear wall is commonly used as a structural member and possesses the characteristics of high stiffness and strength. During earthquake attacks, shear walls usually receive the major lateral forces and are prone to fail in shear. Therefore, prediction of the lateral load displacement curve of shear walls is essential for the seismic assessment of existing buildings. In accordance with the Technology Handbook for Seismic Evaluation and Retrofit of School Buildings published by National Center for Research on Earthquake Engineering, this paper employs the Softened Strut-and-Tie Model to estimate the seismic behavior of low-rise shear walls. By using the simplified strut-and-tie index and shear deformation estimated from the associated strain field at peak load, the proposed curve is greatly simplified and correlates well with the available test results. The current ACI 318-14 Code over-estimates the contribution of shear strength from the shear reinforcement and the proposed model can correct this drawback. In addition to predicting the shear strength of existing shear walls, the proposed model can also provide estimation of shear strength of RC infilled walls in new construction buildings. This application can assist engineers to evaluate accurately the influence of RC infilled walls on the seismic behavior of frames.

並列關鍵字

reinforced concrete ； shear wall ； lateral load displacement curve ； shear strength ； shear deformation ； low-rise