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Pull-out Shear Strength of Planar Reinforced Concrete Members

平面钢筋混凝土构件的拉拔剪切强度

基本信息

批准号：
63550345
负责人：
KAKUTA Yoshio
金额：
$ 1.47万
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：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550345/
关键词：
Reinforced Concrete Slab Footing Punching Shear Pull-out Shear Shear フーチング

项目摘要

A mechanism of failure of reinforced concrete members subjected to pull-out forces is extremely complicated and there are many problems to be made clear. It is known that the punching shear strength decreases as a loading position approaches the free edge of a member, however, the test data concerning such behavior are not enough to be applied to the design of various kinds of members. Furthermore, the effectiveness of shear reinforcement in the case of short shear span still remains uncertain.In this study reinforced concrete slab and deep beam specimens were tested. The variables investigated in the slab tests were distance from load to free edge, depth of loading position ( surface loading and embedded loading), arrangement of main and distribution reinforcements, slab width and presence of stirrups, and those in the deep beam tests were shear span-to-depth ratio, type of shear reinforcement stirrups, horizontal bars, combined stirrups and horizontal bars ) and amount of shear reinforcement.The principal results obtained are as follows; 1) In the design of planar members subjected to pull-out forces it is convenient to classify into five types of failure mechanism; beam shear with full width, beam shear with effective width, punching shear with full length of critical section, punching shear with effective length of critical section and shear of plain concrete. 2) The effect of stirrups in the case of short shear span may be less than the value estimated by the truss theory. Reduction factor as a function of shear span ratio and degree of shear reinforcement may be introduced.

钢筋混凝土构件在拔出力作用下的破坏机理十分复杂，有许多问题需要解决。冲切承载力随加载位置向自由边靠近而降低，但现有的试验数据不足以应用于各类构件的设计。此外，在短剪跨的情况下，抗剪钢筋的有效性仍然是不确定的。在板试验中调查的变量是从荷载到自由边的距离，加载位置的深度（表面荷载和嵌入式荷载）、主筋和分布筋的布置、板宽和箍筋的存在，而深梁试验中的参数为剪跨高比、抗剪钢筋箍筋类型、水平钢筋、主要结果如下：（1）在平面受拔构件的设计中，可方便地将破坏机理分为五种类型;全宽梁剪、有效宽度梁剪、临界截面全长冲切、临界截面有效长度冲切和素混凝土剪。2)在短剪跨情况下，箍筋的作用可能小于桁架理论的估计值。可以引入作为剪跨比和抗剪钢筋程度的函数的折减系数。