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 research seismic performance of precast segmental bridge pier with grouted sleeve and grouted sylphon, and to validate the design of new-built Jia Min north urban viaduct in Shanghai，two precast pier specimens with different connectors and one cast-in-place pier specimen were used to conduct pseudo-static tests. The dimension scale of three specimens with the same shear span ratio was 1∶3. The uniaxial low-frequency cyclic loads were used as horizontal loads in the form of displacement control. Each load level consisted of 3 loops. Specimens were collapsed due to increasingly horizontal action under the same axial force. Failure mode and damage parts of precast concrete bridge piers under two kinds of segment constructions were compared by qualitative observation and quantitative data analysis. And their seismic performance was summarized by analyzing hysteresis curves, skeleton curves, stiffness, ductility, energy dissipation and residual deformation. The results show that the damage of segmental piers with grouted sleeve and grouted sylphon on the cap surface focus on the interface of pier and cap. The displacement ductility of the grouted sylphon with higher equivalent damping ratio is better than that of grouted sleeve while the residual displacement of sleeve one with great equivalent stiffness is minor. Various performance parameters of two precast segmented bridge pier models are similar with those of cast-in-place specimens, meeting the demand of seismic requirements from moderate to high earthquake zones.
关键词
桥梁工程 /
预制拼装桥墩 /
拟静力试验 /
抗震性能 /
套筒 /
金属波纹管
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Key words
bridge engineering /
precast segmental bridge pier /
pseudo-static test /
seismic performance /
sleeve /
sylphon
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中图分类号：
U443.22
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参考文献
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脚注
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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）
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