无抗冲切钢筋的RC板柱节点受冲切承载力计算  

Calculation of punching shear capacity of RC slab-column connections without shear reinforcement

作　　者：夏成亮 史庆轩 王震[1,2] XIA Chengliang;SHI Qingxuan;WANG Zhen(Key Lab of Structural Engineering and Earthquake Resistance(Xi’an University of Architecture and Technology),Ministry of Education,Xi’an 710055,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]结构工程与抗震教育部重点实验室(西安建筑科技大学),西安710055 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《哈尔滨工业大学学报》2022年第4期18-24,共7页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51878540)。

摘　　要：为更精确地预测无抗冲切钢筋的钢筋混凝土(RC)板柱节点受冲切承载力,结合梁剪压破坏机理和修正压力场理论(MCFT),提出一种新的板柱受冲切承载力计算方法。首先,假定无抗冲切钢筋的RC板柱节点冲切荷载由上部剪压区混凝土提供的受剪承载力、斜拉区及受拉区中的骨料咬合力和钢筋的销栓作用共同承担;其次,分析剪压区和斜拉区及受拉区的不同受力状态,分别建立剪压区抗剪承载力计算式和斜拉区及受拉区抗剪承载力计算式;然后,通过统计分析和理论推导得到临界斜裂缝倾角、剪压区高度和受压区高度的计算公式;最后将两部分的抗冲切承载力贡献叠加,建立无抗冲切钢筋的RC板柱节点的受冲切承载力计算方法。使用该计算方法对文献中54个板柱节点试验结果进行验算,计算结果与试验值吻合较好,且变异系数较小。该计算方法可用于无抗冲切钢筋的RC板柱节点的冲切承载力的计算。In order to predict the punching shear capacity of slab-column connections more accurately,a new calculation method for punching shear capacity of slab-column connections was proposed based on the beam shear failure mechanism and modified compression-field theory(MCFT).Firstly,it was assumed that the punching load of reinforced concrete(RC)slab-column connections without shear reinforcement was jointly provided by the concrete in the upper shear compression zone,the aggregate interlock force in the cable-stayed zone,and the dowel action in the tension zone.Secondly,the different stress states of shear compression zone,cable-stayed zone,and tension zone were analyzed,and the shear bearing capacity calculation formulas of shear compression zone,cable-stayed zone,and tension zone were established respectively.Then,through statistical analysis and theoretical derivation,the calculation formulas of the heights of shear compression zone and compression zone,as well as the critical inclined crack angle were obtained.Finally,the contributions of the two parts of the punching resistance capacity were superimposed to establish the calculation method of punching shear capacity of RC slab-column connections without shear reinforcement.The calculation method was applied to predict the ultimate punching shear strength of 54 slab-column connections in relevant literature.Results show that the calculated values were in good agreement with the experimental values,and the variation coefficient was small.The proposed calculation method can be used to calculate the ultimate punching shear strength of RC slab-column connections without shear reinforcement.

关 键 词：修正压力场理论 板柱节点 剪压区高度 临界斜裂缝倾角 冲切承载力 

分 类 号：TU375.2[建筑科学—结构工程]