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Nonlinear Hysteresis Behavior of Precast/Prestressed Concrete Member

预制/预应力混凝土构件的非线性滞后行为

基本信息

批准号：
08455247
负责人：
SHIOHARA Hitoshi
金额：
$ 4.99万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

Prestressed Concrete (PC) members subjected to cyclic bending and shear shows non-linear hysteresis behavior characterized with (1) S-shape loops with origin-oriented unloading branch, and (2) smaller capacity to dissipate hysteretic energy than ordianry reinforced concrete (RC) members. These characteristics seems to be influenced by many factors including amount of prestressing steel, shear force level and bond-slip of between concrete and prestressing steel. The objective of this study is to identify the reason of the characteristics by tests and analyses.In the first year, six prestressing beam specimens were loaded to failure subjected to pure cyclic bending, parameter of which included bond-slip capacity of prestressing steel. In the next year, three 1/2.7 scale exterior beam column joint specimens were loaded to failure to investigate the effect of the slab and shear-to-span ratioin PC members. In the last year, two interior and two exterior beam column joint subassemblies with prestressing in beam were tested to investigate the effect of prestress on the strength and deformation of beam-column connections.From those test results, it is revealed that the strength, stiffness and shape of hysteresis loop were significantly affected by the bond-slip characteristics of prestressing steel. Hence, non-linear cyclic flexural analysis with Bernouri's assumption was extended to be applicable to the PC members taking into account the effect of constitutive relation of bond-slipl. The reliability of the analytical method is examined using the test data.

预应力混凝土(PC)构件在反复弯曲和剪切作用下表现出非线性滞回性能，表现为(1)具有原点导向卸载分支的S型环，(2)比普通钢筋混凝土(RC)构件具有更小的滞回耗能能力。这些特性似乎受到许多因素的影响，包括预应力筋的数量、剪力水平以及混凝土与预应力筋之间的粘结滑移。本研究的目的是通过试验和分析找出这种特性的原因。在第一年，6个预应力梁试件在纯循环弯曲下进行破坏，其参数包括预应力钢材的粘结滑移能力。在第二年，三个1/2.7比例的外梁柱节点试件加载到破坏，以研究板和剪跨比对PC构件的影响。为了研究预应力对梁柱节点强度和变形的影响，进行了两个梁内预应力梁柱节点和两个梁柱外预应力梁柱节点节点的试验，试验结果表明，预应力钢筋的粘结滑移特性对节点的强度、刚度和滞回曲线形状有显著影响。因此，考虑了粘结滑移本构关系的影响，将Bernouri假设下的非线性循环弯曲分析推广到PC构件。利用试验数据验证了分析方法的可靠性。