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Calculational Unified Theory for Calculation of Shear Strength of Linear and Planar Members

线性和平面构件抗剪强度计算的计算统一理论

基本信息

批准号：
08455203
负责人：
KAKUTA Yoshio
金额：
$ 2.88万
依托单位：
HOKKAIDO UNIVERSITY
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 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455203/
关键词：
Linear members Planar members Shear strength Effective Width Shear reinforcement Dowel action Bond action Nonlinear finite element analysis ディープスラブ押抜きせん断破壊はり型せん断破壊

项目摘要

In this study four topics are discussed. The major results obtained are as follows.1) Effective Width for Shear Failure of RC Deep SlabsThe effective width to the shear capacity of RC deep slabs was discussed from the experimental results. The effect of the length of loading plate on the effective width is larger than that of the supporting plate. If it is considered that the effective width is related to the swell of the compressive concrete strut formed between the loading and supporting plates, the shear span ratio is a factor of great importance to the swell.2) Effect of Shear Reinforcement on Local Shear Failure of RC SlabsFor one way and cantilever RC slabs, the shear reinforcing effects were experimentally investigated. In case of the slabs with a punching shear failure, the shear capacities increase with shear reinforcement. In case of the slabs with a beam shear failure, the capacities increase a little. The strain of the shear reinforcement starts to increase suddenly at a certain load, however, the strains do not reach its yield strain when the slabs reaches its ultimate state.3)Modeling for Dowel and Bond Actions of Longitudinal Bars in Shear Failure of RC MembersModeling for the longitudinal bars in a shear resisting mechanism was conducted. The cracking along a longitudinal bar is caused by a combined effect between the dowel and the bond actions. The deformation of the bars can be described by modeling the surrounding concrete as an elasto-plastic spring. The criteria of the cracking is related to a vertical and a slip displacements of the bars.4)Analytical Study on Axisymmetrical RC SlabsAn effect of the shear reinforcement on the shear capacity of axisymmetrical RC slabs can be described by using a nonlinear finite element analysis. The effect of the tensile and shear reinforcing bars on the member stiffness is clarified by the analysis.

在这项研究中，四个主题进行了讨论。主要研究结果如下：1）钢筋混凝土深板剪切破坏的有效宽度根据试验结果，讨论了钢筋混凝土深板剪切破坏的有效宽度对板的抗剪承载力的影响。加载板长度对有效宽度的影响大于支撑板长度对有效宽度的影响。如果认为有效宽度与加载板和支撑板之间的受压混凝土压杆的膨胀有关，剪跨比是影响膨胀的重要因素。2）抗剪钢筋对钢筋混凝土板局部剪切破坏的影响对单向和悬臂钢筋混凝土板进行了抗剪钢筋效应的试验研究。当板发生冲切破坏时，抗剪承载力随抗剪配筋的增加而增加。当板发生梁剪切破坏时，承载力略有提高。在一定的荷载作用下，受剪钢筋的应变开始突然增大，但当板达到极限状态时，其应变还未达到屈服应变。3）钢筋混凝土梁受剪破坏时纵筋的传力和粘结作用模型建立了纵筋抗剪破坏的模型。纵向钢筋的沿着开裂是由销钉和粘结作用的综合作用引起的。钢筋的变形可以通过将周围的混凝土建模为弹塑性弹簧来描述。4）轴对称钢筋混凝土板的分析研究抗剪钢筋对轴对称钢筋混凝土板抗剪承载力的影响可以通过非线性有限元分析来描述。通过分析，阐明了受拉钢筋和受剪钢筋对构件刚度的影响。