水平双轴加载下带翼缘RC 剪力墙抗震性能试验研究  

Experimental study on seismic performance of reinforced concrete shear walls with flange under biaxial lateral loading

作　　者：王斌[1,2] 吴梦臻 史庆轩[1,2] 蔡文哲 弓欢学[1,2] WANG Bin;WU Meng-zhen;SHI Qing-xuan;CAI Wen-zhe;GONG Huan-xue(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 710699,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,陕西西安710055 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]西安工程大学城市规划与市政工程学院,陕西西安710699

出　　处：《振动工程学报》2024年第4期588-600,共13页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(52278215,51808435,52178505);陕西省重点研发计划项目(2024SF-YBXM-646)。

摘　　要：为了揭示双轴耦合效应对不同截面形式带翼缘RC剪力墙多维抗震性能的影响,对3个T形截面和2个L形截面RC剪力墙分别沿其主轴方向进行了低周往复加载试验,对比分析了水平单、双轴加载下带翼缘RC剪力墙的破坏特征、滞回特性、承载力、延性、极限位移角、耗能能力与钢筋应变。研究表明:T形墙和L形墙的破坏均呈现出明显的非对称性,即破坏集中于墙肢自由端,双轴加载加重了带翼缘RC剪力墙的开裂和损伤程度,且易引起剪力墙局部损伤集中;与单轴加载相比,双轴加载不仅削弱了带翼缘RC剪力墙各受力方向的承载力与变形能力、增大了腹板塑性铰区弯曲变形在总变形中的占比、加速了耗能进程、降低了单个方向的耗能能力,并且增大了腹板与翼缘竖向钢筋的应变以及翼缘的剪力滞后效应;双轴耦合效应对L形墙损伤的影响较T形墙更为显著,并导致双轴加载下L形墙各抗震性能指标的衰减程度大于T形墙。考虑双轴受力后,中国抗震规范关于RC剪力墙层间位移角的限值仍较为安全,但安全冗余度降低。To reveal the influence of biaxial coupling effect on the multi-dimensional seismic performance of flanged reinforced concrete(RC)shear walls with different section forms,three T-shaped and two L-shaped RC shear walls were tested under low cyclic loading along their principal axes.The failure modes,hysteretic characteristics,bearing capacity,ductility,ultimate drift ratio,energy dissipation capacity and reinforcement strain of RC shear walls with flange under uniaxial and biaxial lateral loading were com-pared and analyzed.Test results show that failures of T-shaped walls and L-shaped walls exhibit obvious asymmetry,and the damage is concentrated at the free end of wall penal.Biaxial loading aggravates the cracking and damage degree of RC shear wall with flange,and is likely to cause local damage concentration.Compared with the RC shear wall with flange under uniaxial loading,the biaxially loaded specimens have smaller bearing capacity and deformation capacity in all directions,larger proportion of flexural deformation in the plastic hinge area of web segment,faster energy consumption,poorer energy dissipation capacity in a single direction,larger strains of vertical reinforcement in web and flange,and more obvious shear lag effect of flange.Biaxial coupling effect has more pronounced influence on the damage evolution of L-shaped walls than that of T-shaped walls,resulting in greater reduction of seismic performance index of L-shaped walls under biaxial loading than that of T-shaped walls.Considering the biaxial seismic actions,the limit value of inter-story drift ratio of RC shear walls in China's seismic design code is still relatively safe,but the safety redundancy is reduced.

关 键 词：剪力墙 抗震性能 双轴加载 低周往复加载试验 损伤机理 

分 类 号：TU973.16[建筑科学—结构工程] TU352.11