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Research on valuation method establishment of the hinge rotation limit in end of a RC beam

RC梁端部铰链转动极限评估方法建立研究

基本信息

批准号：
20560536
负责人：
MATSUZAKI Yasuhiro
金额：
$ 3.08万
依托单位：
Tokyo University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

It aims at building the technique evaluated about the rotation limit(ductility ability appraisal method・shear design method) in a reinforced concrete beam(RC beam) in this research. The RC beam which is 1/2-1/3 scale of real size carried out the shear and flexial experiment in 2008 and the 2009, and the partial experiment which modeled the hinge segment of the beam end was conducted in the 2010.The hinge region length in a beam end needed to be decided, and the result checked being greatly affected in strength of concrete and an arrangement of steel rods(double line ratio, the amount of shear reinforcement, the space of shear reinforcement) by influence, in order to have evaluated the rotation limit in RC beam. Evaluation by the degree of margin to the flexial capacity of the shear capacity is appropriate to a valuation method. However, when stress concentrated without a beam end hinge region spreading, it proposed that it was necessary to take into consideration that a rotation limit is determined at an early stage.

本研究旨在建立钢筋混凝土梁（RC梁）转动极限的评估技术（延性能力评估法·抗剪设计法）。2008年和2009年进行了真实的尺寸1/2-1/3缩尺的钢筋混凝土梁的抗剪和抗弯试验，2010年进行了模拟梁端铰段的局部试验。混凝土强度和钢筋布置对检测结果影响很大（双线比、抗剪钢筋数量、抗剪钢筋间距）的影响，以评估钢筋混凝土梁的转动极限。用抗剪承载力的裕度来评价抗弯承载力是一种比较合适的评价方法。然而，当应力集中而没有梁端铰链区域扩展时，建议有必要考虑在早期阶段确定旋转极限。