单调和反复荷载作用下弯剪破坏钢筋混凝土柱荷载-变形关系试验研究及简化模型  

Study on lateral load-deformation relations of flexural-shear failure columns under monotonic and cyclic loading

作　　者：张勤[1] 贡金鑫[1] 马颖[2] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]华北水利水电学院水利学院,河南郑州450011

出　　处：《建筑结构学报》2014年第3期138-148,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51278081);国家自然科学基金重点项目(90815027)

摘　　要：为研究单调和反复荷载作用下弯剪破坏钢筋混凝土(RC)柱的变形性能,对10组(20根)不同设计参数的RC柱分别进行单调和低周反复加载试验。对比分析了两种加载方式下RC柱的破坏模式、水平承载力、最大变形及延性等;研究了单调和反复加载下发生弯剪破坏的RC柱的荷载-变形曲线(骨架曲线)的关系;提出了弯剪破坏模式下RC柱荷载-变形曲线的简化计算模型。结果表明:加载方式对RC柱的破坏模式有影响,与单调加载相比,反复加载作用下柱易于发生弯剪或剪切破坏;反复荷载作用下弯剪破坏柱的骨架曲线低于单调加载时的荷载-变形曲线,尤其是在峰值荷载以后;单调和反复荷载作用下RC柱荷载-变形曲线的差异与反复加载引起的循环退化效应有关,在单调荷载-变形曲线的基础上考虑该效应影响可得到反复荷载作用下RC柱恢复力模型,从而简化地震作用下柱的受力分析。采用简化模型计算的弯剪破坏柱的荷载-变形曲线与试验结果吻合较好。In order to study the deformation performance of flexural-shear failure columns under monotonic and cyclic loading, the results of pushover test and quasi-static test on reinforced concrete columns were compared. In this study, twenty reinforced concrete columns were designed and classified into ten groups according to different design parameters, and each group consisted of two same columns. The comparison results, including failure mode, lateral load -carrying capacity, ultimate deformation, ductility, and load-deformation relations of columns under monotonic and cyclic loading systems are presented. It can be seen that the final failure modes are prone to flexural-shear or shear when columns subjected to cyclic loading. For the flexural-shear critical columns, the cyclic envelope curve falls clearly below the monotonic curve due to the effect of cyclic deterioration, especially in the post-peak loading region. Cyclic envelope of flexural-shear failure columns can be obtained based on the corresponding monotonic curve by considering the cyclic deterioration coefficient, which is simple and computationally efficient. Finally, a simplified model for evaluating lateral load-deformation curve of the column failed in flexural-shear is developed based on the experimental data analysis. The predicted envelop curves of column specimens match the experimental data with adequate accuracy.

关 键 词：RC柱 弯剪破坏 单调加载试验 反复加载试验 变形性能 循环退化 

分 类 号：TU375.3[建筑科学—结构工程] TU317.1