基于抛物线形库仑-莫尔准则的钢筋混凝土板抗冲切承载力  

Punching shear strength of reinforced concrete slabs based on parabolic Coulomb-Mohr strength criterion

作　　者：李政启[1] 蒋凤昌[1,2] 李伟[3] 朱慈勉[1] 薛剑胜 

机构地区：[1]同济大学建筑工程系,上海200092 [2]江苏省第一建筑安装有限公司博士后科研工作站,江苏泰州225300 [3]上海应用技术学院城市建设与安全工程学院,上海201418

出　　处：《建筑结构学报》2012年第4期137-141,共5页Journal of Building Structures

基　　金：江苏省第四期"333高层次人才培养工程"

摘　　要：在刚塑性冲切计算模型的基础上,采用二次抛物线形库仑-莫尔混凝土强度准则,运用虚功原理,建立考虑混凝土板中抗弯钢筋销栓作用的冲切承载力计算式。根据已有板冲切试验研究成果,如冲切角和破坏时刻抗弯钢筋应力等数据,对板冲切承载力计算式进行简化,给出简化计算式。与国内外混凝土板冲切试验数据进行计算比较后发现,简化计算式的计算结果较好地符合实测承载力;抗弯钢筋的销栓作用约占钢筋混凝土板总冲切承载力的6%～11%,而忽略抗弯钢筋的销栓作用会给计算结果带来较大影响。Based on the parabolic Coulomb-Mohr strength criterion,a formula for predicting the ultimate punching shear strength of reinforced concrete slabs was developed.The principle of virtual work was used to derive the formula by assuming the punching failure system to be a rigid-plastic punching model.This formula also considered the favorable effects of the dowel action of bending steel rebars on the punching strength of slabs.Referring to other researchers＇ experimental results,such as punching angle and stress in reinforcing bars when punching,a simplification was introduced to make this formula suitable for engineering use.A comparison between numerical results and experimental data shows that the dowel action provides about 6%~11% of the ultimate punching shear strength of the reinforced concrete slabs and the theoretical formula is accurate enough to be a good reference in structural designs.

关 键 词：钢筋混凝土板 冲切承载力 库仑-莫尔准则 销栓作用 

分 类 号：TU375.202[建筑科学—结构工程]