斜截面抗剪强度上限值和预应力混凝土梁最小配筋率计算理论研究  

Theoretical Study on Upper Limit Value of Shear Strength of Inclined Section and Minimum Reinforcement Ratio of Prestressed Concrete Beam

作　　者：吴红林[1] 余金山 马玉全 季振明 蒋峰[1] WU Hong-lin;YU Jin-shan;MA Yu-quan;JI Zhen-ming;JIANG Feng

机构地区：[1]哈尔滨工业大学交通学院,黑龙江哈尔滨150096 [2]内蒙古交通设计研究院有限责任公司,内蒙古呼和浩特010010 [3]广州鼎兴土木科技有限公司,广东广州510655

出　　处：《内蒙古公路与运输》2024年第4期19-24,46,共7页Highways & Transportation in Inner Mongolia

摘　　要：文章遵循基本力学原理,从结构理论出发,推导修正后的混凝土梁斜截面抗剪强度上限值理论与公式,首次给出考虑斜箍筋特殊效应后的斜截面抗剪强度上限值的理论与方法;抗剪实验梁结果证明所提出的抗剪强度上限值理论与方法的正确性;基于预应力束应力全过程分析,首次推导并提出了预应力混凝土梁双值最小配筋率理论与计算方法,明确了预应力混凝土梁最小配筋率存在两个临界点,合理的预应力混凝土梁配筋率在两个临界点形成的范围之内,计算实例证明预应力混凝土梁双值最小配筋率理论的正确性。This paper follows the basic mechanical principle and starts from the structural theory to deduce the modified upper limit value theory and formula of the shear strength of the inclined section of the concrete beam.For the first time,the theory and method of the upper limit value of the shear strength of the inclined section after considering the special effect of the inclined stir-rups are given.The results of the experimental beams prove the correctness of the theory and method of the upper limit value of shear strength proposed in this paper.Based on the whole process analysis of the real stress of prestressed steel strands,the theory and calculation method of"minimum reinforcement ratio of prestressed concrete beams with two values"are deduced and proposed for the first time.This method clarifies that the minimum reinforcement ratio of prestressed concrete beam is two critical points,and the reasonable reinforcement ratio of prestressed concrete beam is within the range formed by the two critical points.The correctness of the theory of"minimum reinforcement ratio of prestressed concrete beams with two values"is proved by calculation examples.

关 键 词：混凝土梁 预应力混凝土梁 抗剪强度 最小配筋率 

分 类 号：TU375.1[建筑科学—结构工程]