Seismic behavior and design of unbonded post-tensioned precast concrete walls
Seismic behavior and design of unbonded post-tensioned precast concrete walls
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DOI：
10.15554/pcij.05011999.72.89
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发表时间：
1999-05-01
期刊：
影响因子：
1.1
通讯作者：
Lu, LW
中科院分区：
文献类型：
--
作者：
Kurama, Y;Pessiki, S;Lu, LW
无粘结后张预制混凝土墙是通过使用不与混凝土粘结的后张钢跨越水平接缝的后张预制墙板建造的。本文介绍了这些墙的抗震性能和设计的分析调查。强度和初始刚度类似于整体现浇混凝土墙的无粘结后张预制墙可以设计为软化并承受大的非线性侧向位移，而几乎没有损坏。非线性行为主要是由于沿水平缝沿着开有间隙。提出了一种基于性能的抗震设计方法，即要求墙体抵抗设计水平的地震运动，但损伤较小，以及抵抗严重的生存水平的地震运动，但没有破坏。通过设计防止沿水平接缝沿着的剪切滑移。非线性动力分析表明，与现浇墙相比，无粘结后张预应力预制墙在地震作用下经历了较大的位移，但累积的残余位移明显较小。
Unbonded post-tensioned precast concrete walls are constructed by post-tensioning precast wall panels across horizontal joints using posttensioning steel which is not bonded to the concrete. This paper describes an analytical investigation of the seismic behavior and design of these walls. Unbonded post-tensioned precast walls with strength and initial stiffness similar to monolithic cast-in-place concrete walls can be designed to soften and undergo large nonlinear lateral drift with little damage. The nonlinear behavior is primarily due to the opening of gaps along the horizontal joints. A performance-based seismic design approach is proposed in which the walls are required to resist design level ground motions with little damage and severe survival level ground motions with damage but without failure. Shear slip along the horizontal joints is prevented by design. Nonlinear dynamic analyses show that, compared to cast-in-place walls, unbonded post-tensioned precast walls undergo larger drift, but accumulate significantly smaller residual drift during an earthquake.