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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。
In order to study the seismic behavior of prefabricated concrete columns with two kinds of connections of grouting sleeves and grouting metal bellows, the design rationality of the prefabricated composite piers of viaduct bridge project in the northern part of Jiaomeng Beicheng, Shanghai was preliminarily verified. Two different connections In the form of prefabricated column specimens for the study, a cast-in-place specimen as a comparison, pseudo-static test study. The shear span ratio of the three specimens is the same, and the scale ratio is 1: 3. Horizontal load in the test using single-axis low-cycle reciprocating loading, the load in the form of displacement control grading. Each load level includes 3 cycles, each specimen under the same constant axial pressure horizontal cyclic loading until damage. Through the qualitative experiment observation and the quantitative data analysis, the damage morphology and the damage location of the precast concrete piers under two kinds of splicing structures are compared, and the specimens are described from the aspects of hysteresis curve, skeleton curve, rigidity, ductility, energy dissipation and residual deformation Seismic performance. The results show that the damage of prefabricated piers with connection of grouting sleeve and grouting metal corrugated pipe connected in the cap is concentrated in the seams between the column and the cap. The displacement ductility of the bellows joint structure is good, The equivalent damping ratio is slightly higher, the residual deformation of the sleeve joint structure is smaller and the equivalent stiffness is larger. The performance parameters of the two kinds of prefabricated piers are generally similar to those of the cast-in-situ test specimen, Seismic requirements.