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.

受到环状弯曲和剪切的预应力混凝土（PC）成员表现出的非线性磁滞性行为，其特征是（1）具有原始导向的卸载分支的S形环，以及（2）比Ordianry reacerced Concrete（RC（RC）散发滞后能的能力（RC ）成员。这些特征似乎受许多因素的影响，包括预应力钢，剪切力水平以及混凝土和预应力钢之间的粘结滑移。这项研究的目的是通过测试和分析确定特征的原因。在第一年，将六个预应力束样本装载为遭受纯环状弯曲的故障，其参数包括预应力钢的键滑能力。第二年，将三个1/2.7尺度的外束柱接头样品加载到未能研究板和剪切比率PC成员的效果。在过去的一年中，测试了两个内部和两个外束柱柱关节子组件，并测试了带有束前夕的特定仪，以研究预应力对梁柱连接的强度和变形的影响。从这些测试结果，揭示了强度，刚度的刚度磁滞回路的形状受到预应力钢的键滑特性的显着影响。因此，通过考虑到债券-SLIPL的构成关系的效果，扩展了具有Bernouri假设的非线性环状弯曲分析，适用于PC成员。使用测试数据检查了分析方法的可靠性。