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Deformation Capacity of Reinforced Concrete Columns with Varying Axial Load and Diagonal Lateral Load

变轴向荷载和对角横向荷载下钢筋混凝土柱的变形能力

基本信息

批准号：
07650655
负责人：
KATO Daisuke
金额：
$ 1.34万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Recent earthquake resistant design concept of structures places explicit emphases on the inelastic deformation capacity in addition to the previously accepted resisting capacity. Deformation capacities of reinforced concrete members are determined by shear failure, bond failure, flexural failure or buckling of main bars after flexural yielding of the sections. In the design guidelines for earthquake resistant reinforced concrete buildings based on ultimate strength concept proposed by Architectural Institute of Japan, practical design equations for ductility are presented for the first two failure mechanisms. However, only ambiguous specification for arranging methods are regulated for the last two failure mechanisms.The objective of this paper is to propose an evaluating equation for deformation capacities determined by flexural failure, which may be caused by the compressive failure of the core concrete. The effects of the compressive failure of the core concrete become significant for corner columns subjected to varying high axial load. Therefore, these problems are discussed paying special attention to the effects of the varying axial load. Core sections with the same amount of longitudinal reinforcement both in tension and compression were studied. The ragid-plastic relation was assumed for steel bars and the stress block relation without energy dissipation under cyclic loading was assumed for concrete. Under these assumptions the ultimate curvature of a column subjected to varying axial load can be expressed. Finally, the proposed evaluating equation for deformation capacities determined by flexural failure was foun to be effective to evaluate the deformation capacities of columns with varying axialload.

近年来的结构抗震设计理念，除了强调结构的抗震能力外，还强调结构的非弹性变形能力。钢筋混凝土构件的变形能力取决于截面弯曲屈服后主筋的剪切破坏、粘结破坏、弯曲破坏或屈曲。在日本建筑学会提出的基于极限强度概念的抗震钢筋混凝土建筑设计导则中，对于前两种破坏机制，给出了延性的实用设计公式。本文的目的是提出一个由核心混凝土受压破坏引起的弯曲破坏所决定的变形能力的评估公式。核心混凝土受压破坏的影响变得显着角柱承受不同的高轴向载荷。因此，这些问题进行了讨论，特别注意的影响，变化的轴向载荷。研究了在拉、压荷载作用下纵向钢筋配筋量相同的核心截面。在循环荷载作用下，钢筋假定为弹塑性关系，混凝土假定为无能量耗散的应力块体关系。在这些假设下，可以表示承受变化轴向荷载的柱的极限曲率。最后，本文提出的由弯曲破坏确定的变形能力评估公式可以有效地评估变轴压柱的变形能力。