弯剪耦合破坏T形截面RC剪力墙抗震性能试验研究  

Experimental study on seismic behavior of T-shaped RC shear walls failed in a flexure-shear coupling mode

作　　者：王斌[1,2] 张黎鹏 吴梦臻 蔡文哲 史庆轩[1,2] 李涵 WANG Bin;ZHANG Lipeng;WU Mengzhen;CAI Wenzhe;SHI Qingxuan;LI Han(State Key Laboratory of Green Building in Western China,Xi’an University of Architecture&Technology,Xi’an 710055,China;School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;School of Urban Planning and Municipal Engineering,Xi’an Polytechnic University,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学西部绿色建筑国家重点实验室,西安710055 [2]西安建筑科技大学土木工程学院,西安710055 [3]西安工程大学城市规划与市政工程学院,西安710055

出　　处：《振动与冲击》2023年第24期308-316,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(52278215,51808435);陕西省教育厅专项科研计划(22JK0434);陕西省自然科学基础研究计划(2022JQ-392);西部绿色建筑国家重点实验室基金(LSZZ202221,LSKF202212)。

摘　　要：针对T形截面RC(reinforced concrete)剪力墙潜在的翼缘受拉方向受剪控制破坏和翼缘受压方向受弯控制破坏共存的现象,对两个弯剪耦合控制和一个受弯控制T形墙进行了拟静力试验,对比分析了T形墙的裂缝分布形态和破坏机理,考察了剪跨比和水平钢筋配筋率对T形墙抗震性能的影响。结果表明:弯剪耦合控制T形墙的破坏集中于腹板自由端,且破坏区域沿斜向贯穿整个边缘约束区;减少水平钢筋配筋率会加剧T形墙斜裂缝和竖向错动裂缝的开展,并导致形心轴附近产生“分缝”现象,以此抵消剪切效应增强引起的变形能力降低;减小剪跨比会大幅降低T形墙的延性和耗能能力降低,并导致剪切变形占比增大至50%。各国规范对于T形墙受剪承载力的计算存在明显差异和不足,为实现“强剪弱弯”的抗震设计目标,安全起见应保证T形墙的受剪承载力至少高于受弯承载力15%;虽然弯剪耦合破坏T形墙在翼缘受拉方向的变形能力较差,但仍满足我国抗震规范关于罕遇地震下层间位移角限值的要求。Aiming at the potential coexistence of shear-controlled failure for the flange-in-tension case and flexure-controlled failure for the flange-in-compression case of T-shaped reinforced concrete shear walls,two flexure-shear coupling controlled walls and one flexure-controlled wall were tested under quasi-static loading.The crack distribution pattern and failure mechanism of T-shaped walls were compared and analyzed,and the effects of shear span ratio and horizontal reinforcement ratio on the seismic behavior of T-shaped walls were investigated.Test results show that the flexure-shear coupling controlled T-shaped walls failed due to the localized damage of the free end of the web,and the failure zone penetrated obliquely over the entire boundary restraint region.Reducing the horizontal reinforcement ratio would aggravate the development of inclined cracks and vertical staggered cracks in T-shaped walls,leading to the phenomenon of“splitting”near the centroidal axis,so as to offset the reduction of deformation capacity caused by intensified shear effect.Decreasing the shear span ratio would significantly weaken the ductility and energy dissipation capacity of the T-shaped walls,resulting in an increased proportion of shear deformation to 50%.There are obvious differences and deficiencies in the calculation of shear capacity of T-shaped walls based on design codes at home and abroad.In order to achieve the seismic design goal of“strong shear-weak bending”,the shear capacity of T-shaped walls should be at least 15%higher than the flexural capacity for safety.Although the T-shaped walls failed in flexure-shear coupling mode exhibit poor deformation capacity in the flange-in-tension loading direction,it still meets the inter-story drift ratio limit under rare intensity earthquake required by Chinese seismic design code.

关 键 词：RC剪力墙 T形截面 拟静力试验 抗震性能 受剪性能 受剪承载力 

分 类 号：TU375[建筑科学—结构工程]