预制陶粒混凝土空心剪力墙偏心受压性能的试验研究  

Experimental study on eccentric compression performance of precast ceramsite concrete hollow shear wall

作　　者：郑宏宇[1,2] 郑煜缤 彭杰 常岩军[1,2] 郁宇琪 ZHENG Hongyu;ZHENG Yubin;PENG Jie;CHANG Yanjun;YU Yuqi(School of Civil Engineering and Architecture,Guangxi University,Nanning,Guangxi 530004,China;Key Laboratory of Disaster Prevention and Structure Safety of Chinese Ministry of Education,Nanning,Guangxi 530004,China;Hunan Electric Power Design Institute Co.Ltd.CEEC,Changsha,Hunan 410007,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]中国能源建设集团湖南省电力设计院有限公司,湖南长沙410007

出　　处：《石河子大学学报（自然科学版）》2023年第2期207-213,共7页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金(11962001,51968004)。

摘　　要：预制陶粒混凝土空心剪力墙可进一步减轻剪力墙预制件的自重,降低吊运成本和地震效应,为了研究其偏心受压性能,先以混凝土种类和圆筒形芯模布置方向为变量,制作普通混凝土和陶粒混凝土的空心剪力墙试件各2个,偏心率取为0.80,通过静力偏心加载试验观测试件的破坏形态、承载力、挠度和钢筋应变,试验结果表明:所有试件均为大偏心受压破坏,具有延性破坏特征;其他参数相同时,芯模筒长沿轴力方向布置的空心剪力墙在极限承载力、抗裂能力和刚度方面优于芯模筒长垂直于轴力方向布置的空心剪力墙。再以空心率为变化参数,采用ANSYS进行有限元拓展分析,结果表明:空心率为20.8%的空心剪力墙的承载力与相同条件的实心剪力墙相比,降低率在6%以内;随空心率的增大,陶粒混凝土空心剪力墙的承载力降低,但空心率达40%时,承载力的降低率仅为6%。最后采用现行规范估算本试件的承载力,计算值与试验值吻合度较好,因此,可采用等效截面按规范估算空心剪力墙的偏压承载力。Precast ceramsite concrete hollow shear wall can further lighten the weight of precast shear wall,which can reduce lifting,transportation costs and seismic effect.In order to study its eccentric compression performance,considering the type of concrete and the direction of cylindrical core mold arrangement as variables,four hollow shear wall specimens cast with normal concrete and ceramsite concrete respectively were made and test by static eccentric loading,which eccentricity was set at 0.80.The failure mode,bearing capacity,deflection and reinforcement strain of the specimens were observed and collected.The test results show that all specimens failed in large eccentric compression mode,with obvious ductile characteristics;when other parameters are the same,the hollow shear wall with core mold's length parallel to the axial force direction can provide larger ultimate bearing capacity,crack resistance and stiffness,comparing with the one with core mold's length perpendicular to the axial force direction.Then,taking the hollow ratio as the variable,the finite element expansion analysis was carried out by ANSYS.The analysis results show that the bearing capacity of the hollow shear wall with the hollow ratio of 20.8%is within 6%lower than that of the solid shear wall under the same conditions;with the increase of hollow ratio,the bearing capacity of ceramsite concrete hollow shear wall decreases,and when the hollow ratio reaches 40%,the decrease rate of bearing capacity is only 6%.Finally,the bearing capacity of the specimens is estimated according to the current design codes,and the estimated value is in good agreement with the experimental value.Therefore,the compressive bearing capacity of the hollow shear wall can be accurately estimated according to the codes and using the equivalent section method.

关 键 词：轻质混凝土 空心剪力墙 陶粒 偏心受压 承载力 有限元 

分 类 号：TU375[建筑科学—结构工程] TU377.1