小剪跨比混凝土叠合框架梁梁端抗震性能试验研究

发布时间：2018-04-09 03:32

本文选题：叠合框架梁　切入点：小剪跨比　出处：《建筑结构学报》2017年12期

【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。
[Abstract]:Eight specimens with high shear span ratio of 1.42 and HRB500 high strength longitudinal reinforcement were designed. The low cycle repeated loading tests were carried out on the specimens, and the crack development characteristics, failure patterns, hysteretic curves and skeleton curves of the composite beams were studied.The effects of hoop type and joint type on the seismic behavior of composite beams are analyzed.The experimental results show that the horizontal superimposed surface and the bonding surface of the superimposed specimen have cracks and slippages, the hysteretic curve is clamped, the energy dissipation and bearing capacity are smaller than that of the cast-in-situ specimen, but the displacement ductility coefficient is larger than that of the cast-in-situ specimen.The displacement ductility coefficient of the specimens subjected to bending failure is 4.2 ~ 8.3and the coefficient of displacement ductility of the shear failure specimens is 2.4 ~ 6.4.The high strength longitudinal tendons of all specimens are subjected to tensile yield before the ultimate bearing capacity is reached, and the stirrups of shear-compression failure specimens are also subjected to tensile yield.According to the code GB 50010-2010, the average value of the ratio of the bearing capacity to the test value of the composite specimen calculated according to the code GB 50010-2010 is 0.82.The average value of the ratio of the bearing capacity of the flexural failure superimposed specimen to that of the cast-in-place specimen is 0.85, and the type of hoop has little effect on the ultimate bearing capacity of the composite specimen.The composite composite stirrups with closed stirrups have relatively high seismic performance because there is no cracking in the composite specimens of keyway joints.
【作者单位】：同济大学土木工程学院;中国建筑科学研究院;
【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)
【分类号】：TU375.4

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