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Clarification of Out-plane Shear Resisting Mechanism of Planer Member and Design

平面构件抗平面剪力机理的阐明及设计

基本信息

批准号：
04650414
负责人：
KAKUTA Yoshio
金额：
$ 1.34万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650414/
关键词：
Reinforced concrete Slab Punching shear Axial force Shear reinforcement Continuous fiber reinforcement Finite element analysis Axis-symmetric problem

项目摘要

In this year the objectives were- evaluation of influence of shear reinforcement amount on punching shear strength- establishment of a macro model for out-plane shear resisting mechanism using nonlinear finite element analyzesThe results are summarized as follows :1 In order to clarify the influence of shear reinforcement amount, two-way slabs were tested in which shear reinforcement amount was varied from 0 to 0.34% by varying number of deformed stirrups with the same diameter. Although apunching shear strength in the case without the stirrup was understimated by the equations in CEB/FIP Model Code 90 (The equation in JSCE's Standard Specification estimated it reasonably.), increments in the punching shear strength with increase in shear reinforcement amount was estimated approximately. For the cases of small amounts of shear reinforcement (0.11 and 0.23%) the ovserved strength increments were less than the predicted ones probably because the stirrups were placed at too big spacings.2 Since variation of punching shear strength due to variation of tensile reinforcement stiffness (ratio times elastic modulus) is the same as that of shear compression strength of linear members, a new macro model was proposed applying the shear resisting model for linear members which was derived from numerical experiments with nonlinear finite element analyzes to planer members (slabs). This model consists of shear resisting of concrete in compression zone and shear resisting in shear cracking zone. It is necessary to quantify sizes and critical stresses of the two zones.Presently a constitutive model for concrete subject to tri-axial stresses is being implemented into the program of the nonlinear finite element analysis. It is mecessary to establish a macro model for shear resisting in which unclarified parameters, such as loading area configuration and shear span to depth ratio, are considered, conducting numerical and experimental analyzes.

本年度的主要研究内容为：1.为了研究抗剪配筋量对冲切承载力的影响，通过改变同直径变形箍筋的数量，使抗剪配筋量在0 ~ 0.34%范围内变化，对双向板进行了试验研究。虽然CEB/FIP Model Code 90中的公式低估了不带锚栓的情况下的冲击剪切强度（JSCE标准规范中的公式合理地估计了它），近似估计了冲切强度随抗剪钢筋量增加的增量。对于少量抗剪钢筋的情况（0.11%和0.23%），观测强度增量小于预测值，可能是因为箍筋间距过大。2由于受拉钢筋刚度的变化引起冲切强度的变化（比乘以弹性模量）与线性构件的剪切压缩强度相同，摘要将非线性有限元数值试验得到的线性构件抗剪模型应用于平面构件（板），提出了一种新的宏观模型。该模型包括受压区混凝土的抗剪承载力和剪切开裂区混凝土的抗剪承载力。目前，混凝土三轴应力本构模型已被应用到非线性有限元分析程序中。需要建立宏观抗剪模型，考虑加载区形态、剪跨比等不明确的参数，进行数值和试验分析。