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Study on Type II Shear Failure Mechanism of Reinforced Concrete

钢筋混凝土II型剪切破坏机理研究

基本信息

批准号：
07455423
负责人：
TANABE Tada-aki
金额：
$ 1.15万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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

As has been mentioned in the proposal document, this research aimed at the clarifying the post peak behavior of reinforced concrete structural failure in the shear mode (we call this type of failure as the shear failure mode of the second type) and the failure velocity in the failing stage. The first step was to develop computer programs which can catch the shear failure mode in the post peak stages. Though we have encountered many difficulties in dealing with the complexity of constitutive equations in the tangential state and the treatment of reinforcing materials and its amalgamation to find out the critical state of acrostic tensor, we have succeeded in developing the 2D finite element programs.In the second stage, we have developed the testing apparatus to perform the shear failure tests of wall type structures. Since all the machine parts are designed by the researcher, it was completed with relatively low expenditure. It was now installed in the Yamanashi University, concrete laboratory, which shared the project in the experimental portion. The testing machine has the special feature that it can maintain the horizontally of rather long top edge line of structural specimens while giving horizontal load as well as vertical load to specimens. Using the apparatus, we have succeeded to give rise to the shear failure mode of second type for the orthogonally reinforced wall specimen as anticipated by the theory.This means that we have succeeded to estimate the failure mode of this type for other structural elements more generally.For the second aim of this project was to clarify the failure velocity of shear failure. In this regards, we have developed the theoretical formulation in the similar way as shock failure prediction.All these research results are published or to be published as listed in the same document.

如建议文件中所述，本研究旨在阐明钢筋混凝土结构在剪切模式下破坏的峰后行为（我们称这种破坏为第二类剪切破坏模式）和破坏阶段的破坏速度。第一步是开发计算机程序，可以捕捉剪切破坏模式后峰阶段。虽然在处理切向状态下本构方程的复杂性和处理加强材料及其合并以确定间隙张量临界状态方面遇到了许多困难，但我们成功地开发了二维有限元程序。由于所有的机器部件都是由研究人员设计的，所以它是以相对较低的成本完成的。它现在被安装在山梨大学混凝土实验室，在实验部分共享该项目。该试验机的特点是在对试件施加水平荷载和垂直荷载的同时，能保持结构试件较长顶边线的水平。利用该装置，我们成功地给出了理论所预期的正交加筋墙试件的第二类剪切破坏模式，这意味着我们已经成功地估计了其他结构元件的这类破坏模式。本项目的第二个目的是阐明剪切破坏的破坏速度。在这方面，我们已经开发了类似的冲击故障预测的理论公式。所有这些研究成果发表或将发表在同一文件中列出。