摘要
为计算配有常用抗冲切钢筋(箍筋和栓钉)的钢筋混凝土(RC)板柱节点的受冲切承载力,结合梁斜拉破坏机理和修正压力场理论(MCFT)提出一种配有抗冲切钢筋的RC板柱节点的受冲切承载计算方法.首先根据MCFT推导出配有抗冲切钢筋的RC板柱节点的临界斜裂缝倾角计算式;然后,假定冲切破坏时临界截面周长范围内的抗冲切钢筋达到屈服强度,将临界斜裂缝倾角代入MCFT推导出板柱节点的受冲切承载力计算方法;最后,使用该方法和美国规范(ACI 318-19)方法计算62个配有抗冲切钢筋的RC板柱节点试验的冲切承载力,并分析了混凝土强度、板有效厚度、柱截面边长、抗弯钢筋配筋率及抗冲切钢筋配筋率对节点抗冲切承载力的影响.结果表明:由MCFT推导出的节点受冲切承载力计算值与试验值吻合较好,均值为0.96,变异系数为0.20;节点的冲切承载力与上述影响因素呈非线性正相关.该方法可用于配有抗冲切钢筋的RC板柱节点的受冲切承载力计算.
To calculate the punching shear capacity of reinforced concrete(RC)slab-column connections equipped with commonly used shear reinforcement(e.g.stirrups and bolts),a shear strength calculation method for RC slab-column connections reinforced with shear reinforcement is proposed by combining the diagonal-tension failure mechanism of beams and the modified compression-field theory(MCFT).First,the calculation formula for the critical inclined crack angle of RC slab-column connections equipped with shear reinforcement is derived based on the MCFT.Then,assuming that the shear reinforcement within the perimeter of the critical section reaches the yield strength during punching failure,the critical inclined crack angle is substituted into MCFT to derive the calculation method for the punching shear capacity of the slab-column connections.Finally,the punching shear capacity for 62 RC slab-column connections equipped with shear reinforcement is calculated using the method and the American code(ACI 318-19)approach,and the influences of concrete strength,effective plate thickness,column section length,bending reinforcement ratio,and shear reinforcement ratio on the punching shear capacity of these connections are analyzed.The results show that the calculated punching shear capacity derived from MCFT aligns well with experimental values,with an average coefficient of 0.96 and a variation of 0.20.The punching shear capacity of connections exhibits a non-linear positive correlation with the influencing factors mentioned above.The method can be used to calculate the punching shear capacity of RC slab-column connections with shear reinforcement.
作者
夏成亮
史庆轩
赵元浩
Xia Chengliang;Shi Qingxuan;Zhao Yuanhao(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Key Laboratory of Structural Engineering and Earthquake Resistance of Ministry of Education,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第2期368-378,共11页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51878540)。
关键词
板柱节点
冲切承载力
修正压力场理论
临界斜裂缝倾角
冲切配筋率
slab-column connection
punching shear capacity
modified compression-field theory(MCFT)
critical inclined crack angle
punching shear reinforcement ratio
