预制拼装联接件形式对桥墩抗震性能的影响

发布时间：2018-09-19 05:57

【摘要】：为研究采用灌浆套筒和灌浆金属波纹管2种联接件形式预制拼装混凝土立柱的抗震性能,初步验证上海市新建嘉闵北城市高架桥梁工程预制拼装桥墩的设计合理性,以2根采用不同联接件形式的预制立柱试件为研究对象,1根现浇试件作为对比,进行拟静力试验研究。3根试件的剪跨比相同,缩尺比均为1∶3。试验中水平向荷载采用单轴低周往复加载,荷载以位移控制的形式分级施加。每个荷载等级包括3个循环,各试件在相同的恒定轴向压力作用下水平循环加载直至破坏。通过定性试验观察和定量数据分析,比较了2类拼接构造下预制混凝土桥墩的破坏形态、损伤部位,并从滞回曲线、骨架曲线、刚度、延性、耗能、残余变形等方面描述了试件的抗震性能。结果表明:联接构造设置于承台内的灌浆套筒联接和灌浆金属波纹管联接的预制拼装桥墩在破坏时损伤均集中在立柱与承台接缝处;波纹管联接构造的位移延性较好,等效阻尼比略高,套筒联接构造的残余变形较小,等效刚度较大;2种新型预制拼装桥墩的各项性能参数与现浇试件大体相近,均可满足中高强度地震区域的抗震要求。
[Abstract]:In order to study the aseismic performance of precast concrete columns with grouting sleeve and grouting metal bellows, the design rationality of precast and assembled piers for the new Shanghai Jia-min Bei City elevated bridge project was preliminarily verified. Taking two prefabricated column specimens with different connectors as the object of study and one cast-in-situ specimen as the contrast, the shear span ratio and the scale ratio of the 3 specimens were the same and the scale ratio were 1: 3 respectively. In the experiment, the horizontal load is loaded by uniaxial low cycle reciprocating, and the load is applied in the form of displacement control. Each load grade consists of three cycles, and each specimen is subjected to horizontal cyclic loading and failure under the same constant axial pressure. Through qualitative test observation and quantitative data analysis, the failure pattern, damage location, hysteretic curve, skeleton curve, stiffness, ductility, energy consumption of precast concrete pier under two kinds of splicing structures are compared. The seismic behavior of the specimen is described in terms of residual deformation. The results show that the damage of prefabricated piers with grouting sleeve connection and grouting metal bellows connection is concentrated at the joint between column and cap, and the displacement ductility of corrugated pipe connection is good. The equivalent damping ratio is slightly higher, the residual deformation of sleeve connection structure is smaller, and the performance parameters of two new prefabricated assembled piers are similar to those of cast-in-place test pieces, which can meet the seismic requirements in the area of moderate and high strength earthquakes.
【作者单位】：同济大学桥梁工程系;中交公路规划设计院有限公司;
【基金】：国家自然科学基金项目(51178350,51378386) 上海市科学技术委员会科研计划项目(13231200800)
【分类号】：U442.55;U443.22

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