基于修正压力场理论的有腹筋钢筋混凝土受弯构件受剪计算  

Shear strength prediction of reinforced concrete flexural members with stirrups based on modified compression field theory

作　　者：魏巍巍[1,2] 贡金鑫[1] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]中交公路规划设计院有限公司,北京100088

出　　处：《建筑结构学报》2011年第5期135-141,共7页Journal of Building Structures

基　　金："十一五"国家科技支撑计划项目(2006BAJ01B06-06)

摘　　要：修正压力场理论认为有腹筋构件的受剪承载力由沿裂缝面传递的剪应力和穿过裂缝面的箍筋提供,忽略了受压区承担的剪力,受剪承载力计算结果偏小。基于修正压力场理论,根据钢筋混凝土受弯构件的剪切破坏机理,考虑上部受压区混凝土和下部受拉区骨料咬合力及箍筋共同提供受剪承载力,提出截面受剪承载力计算方法。与所收集的国内外有腹筋梁的275个试验结果的比较表明:采用本文方法计算的受剪承载力与试验结果的变异性较小,可用于钢筋混凝土梁的抗剪分析。In the MCFT,shear capacity of RC members is considered to be resisted by cracked concrete and stirrups.So,the shear capacity calculated by MCFT is underestimated due to ignortion of the shear carried by concrete in compression zone.In this paper,a further study was made based on the modified compression field theory.A method for predicting the shear capacity considering the contribution of the concrete in compression,shear stress transferred across the crack interface,and stirrups based on shear failure mechanism of reinforced concrete member was developed and verified with extensive experimental data from different sources（275 data sets in total）.It is found that the variation coefficients of ratio of shear strength calculated using the derived expressions to test data are small.So it is suitable for shear analysis of reinforced concrete beams.

关 键 词：钢筋混凝土梁 修正压力场理论 抗剪模型 抗剪强度 

分 类 号：TU375.101[建筑科学—结构工程]