钢筋混凝土柱受拉区受火后承载力简化计算公式  

Simplified calculating formula about residual capacity of reinforced concrete column in the drawn area after fire

作　　者：卜国艳[1] BU Guo-yan(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《青岛理工大学学报》2019年第1期40-47,共8页Journal of Qingdao University of Technology

摘　　要：受拉区受火后钢筋和混凝土之间的黏结强度会降低,黏结强度的降低必然会影响到构件的极限承载能力.取钢筋和混凝土的隔离体进行分析,利用平衡方程、变形方程、物理方程将黏结强度降低对构件极限承载力的影响反映在钢筋的抗拉强度设计值上.将高温后的钢筋抗拉强度设计值以及经过f_(cu,T)/f_(cu)的混凝土抗压强度设计值代入到本文所推导的高温后构件剩余承载力简化公式中,就可以得到构件的剩余承载力.理论计算结果与试验值相比,误差在25%以内,证明公式在一定的范围内是适用的.The bonding strength between bar and concrete in the drawn area after fire will reduce,as will influence the ultimate bearing capacity of the column.The isolator of bar and concrete is analyzed in the paper based on the equilibrium equation,physical equation and deformation equation,and the influence on the ultimate bearing capacity of the column from the reduction of bonding strength will reflect the design tensile strength of the rebel.The design tensile strength of the steel bar after fire and the design value of compressive strength of concrete with the discount of f cu,T/f cu are substituted in the simplified calculation formula about residual capacity of the component inferred in this paper.After fire,the residual capacity of the member can be got.Compared with theoretical calculation result and trial value with the error within 25%,the formula proves to be in point within a certain range.

关 键 词：火灾 黏结强度 剩余承载力 简化计算公式 

分 类 号：TU375[建筑科学—结构工程]