PC与RC空心墩抗震性能试验对比

发布时间：2018-02-21 13:08

本文关键词： 桥梁工程空心墩拟静力试验抗震性能耗能钢筋　出处：《中国公路学报》2015年04期 　论文类型：期刊论文

【摘要】：为研究PC空心墩的抗震性能,设计制作了3个PC空心墩(1个整体式和2个装配式),并用1个RC空心墩作为对比试件,对4个试件进行了拟静力试验。基于试件的破坏特征、滞回性能、曲率分布、剪切变形等试验结果,详细比较了RC及PC整体式、PC装配式空心墩的承载力、刚度、延性、耗能、复位能力等抗震性能,分析了预应力轴压比对空心墩抗震性能的影响。研究结果表明:RC空心墩中布置无粘结后张预应力筋可以有效降低残余位移,对累积滞回耗能影响不大,但可减小等效粘滞阻尼比;布置耗能钢筋的PC装配式空心墩的自复位能力较强,曲率分布和剪切错动主要集中在墩底接缝处,其损伤程度比整体式空心墩轻的多;预应力轴压比过大可导致保护层混凝土提前被压碎,使空心墩屈服后出现负刚度。
[Abstract]:In order to study the seismic behavior of PC hollow piers, three PC hollow piers (1 integral and 2 assembled) were designed and manufactured. Four specimens were tested by pseudostatic test with one RC hollow pier as a contrast specimen. Hysteretic performance, curvature distribution, shear deformation and other experimental results are compared in detail. The aseismic properties of RC and PC monolithic hollow piers are compared in detail, such as bearing capacity, stiffness, ductility, energy dissipation, reset capacity, etc. The effect of prestressing axial compression ratio on seismic behavior of hollow piers is analyzed. The results show that unbonded post-tensioned tendons can effectively reduce residual displacement and have little effect on cumulative hysteretic energy consumption. But it can reduce the equivalent viscous damping ratio, the PC assembled hollow pier with energy dissipation bar has a strong self-reset ability, the curvature distribution and shear dislocation are mainly concentrated at the joint at the bottom of the pier, and the damage degree is much lighter than that of the integral hollow pier. If the prestressing axial compression ratio is too large, the concrete of the protective layer will be crushed ahead of time and the hollow pier will yield with negative stiffness.
【作者单位】：石家庄铁道大学土木工程学院;石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室;
【基金】：河北省自然科学基金项目(E2011210028,E2015210038)
【分类号】：U443.22;U442.55

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