小剪跨比混凝土叠合框架梁梁端抗震性能试验研究  

Experimental research on seismic behaviors of composite concrete frame beam-ends with small shear-span-ratio

作　　者：赵勇[1] 陈嘉伟[1] 田春雨[2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]中国建筑科学研究院,北京100013

出　　处：《建筑结构学报》2017年第12期22-31,共10页Journal of Building Structures

基　　金："十三五"国家科技支撑计划(2016YFC0701903-2);"十二五"国家科技支撑计划(2011BAJ10B02)

摘　　要：设计了8个剪跨比为1.42、配置HRB500高强纵筋的混凝土叠合框架梁梁端试件,对其进行了低周反复加载试验,研究了叠合梁的裂缝发展特征、破坏形态、滞回曲线、骨架曲线、位移延性等抗震性能以及极限承载能力,分析了配箍形式和结合面类型对叠合梁抗震性能的影响。试验结果表明:叠合试件的水平叠合面和结合面出现开裂和滑移,其滞回曲线出现捏拢,耗能和承载力均小于整浇试件,但其位移延性系数大于整浇试件;受弯破坏试件的位移延性系数为4.2~8.3,剪压破坏试件的位移延性系数为2.4~6.4;达到极限承载能力前,所有试件的高强纵筋均受拉屈服,剪压破坏试件的箍筋也受拉屈服;按规范GB 50010-2010计算的叠合试件承载力与试验值之比的平均值为0.82,受弯破坏的叠合试件与整浇试件的承载力之比的平均值为0.85;配箍形式对叠合试件的极限承载能力影响不大,配置复合式组合封闭箍筋的键槽结合面叠合试件未出现叠合面开裂,其抗震性能相对较高。Eight composite concrete frame beam-ends with HRB500 high-yield-strength longitudinal rebars were tested under low frequency cyclic loading. The shear-to-span ratio of the specimens was 1. 42. The seismic behaviors were analyzed including crack development characteristics, failure mechanism, hysteretic behavior, skeleton curves,displacement ductility and bearing capacity. The influences of stirrup arrangements and beam-end interface types on the seismic behaviors were also investigated. The research results show that the beam-end interface and horizontal interface of composite beam will crack and slip,which results in the obvious pinching of hysteretic loops. Meanwhile,the energy dissipation capacity and bearing capacity of the composite beams are smaller than the cast-in-situ ones. However,the situation of displacement ductility factors is just the opposite. Moreover,the displacement ductility factor of specimens subjected to bending failure is from 4. 2 to 8. 3,and the displacement ductility factor of specimens subjected to shearcompression failure is from 2. 4 to 6. 4. The specimens＇ longitudinal rebars can yield before the peak load,and the stirrups of the specimens which are subjected to the shear-compression failure can also yield. The composite beams＇ average ratio of the value calculated according to the code GB 50010—2010 and the testing ultimate bearing capacity is0. 82. For the specimens subjected to bending failure,the average ratio of the ultimate bearing capacity of composite beams to that of the cast-in-situ one is 0. 85. The arrangements of stirrup have little effect on the ultimate bearing capacity of the specimens. The specimens with combined two-piece stirrups and key joint surfaces do not crack at the horizontal interface,and the seismic performance is relatively good.

关 键 词：叠合框架梁 小剪跨比 高强钢筋 低周反复加载试验 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1