结合实例探讨钢筋屈服后混凝土楼板裂缝宽度的数值方法  

Study of Concrete Floor Crack Width after Reinforcemet Yielded by Numerical Simulation Method with Example

作　　者：杨建江[1] 李苏盐[1] 余地华 

机构地区：[1]天津大学建筑工程系,300072 [2]中建三局工程总承包公司,天津300380

出　　处：《特种结构》2014年第1期30-33,43,共5页Special Structures

摘　　要：本文首先以双向板塑性绞线法为背景,通过计算极限荷载判断楼板纵筋屈服,采用数值模拟的办法研究了钢筋屈服后混凝土楼板的裂缝宽度。这种方法基于Houde黏结滑移理论,假定模型条件和加设COMBINE39三维非线性弹簧单元模拟出钢筋与混凝土之间的黏结滑移,滑移产生的单元间相对位移差即为裂缝宽度。同时以工程实测裂缝宽度为依据,检验数值模拟裂缝宽度的可行性,为探究钢筋屈服后混凝土楼板裂缝宽度提供了实际参考价值。Based on the background of bridirectional floor yeld line method, by means of calculating ultimate load judging reinforcement yield,this paper studied the crack width of concrete after reinforcement yielded by numerical simulation method. This method.simulated the bond-slip of reinforcement and concrete, by the method of assuming model conditions and adding COMBINE39 three-dimensional nonlinear spring element, receiving the crack width which was the difference of relative displacement of slip. By the time, checking the correctness of the numerical simulation made accord with the engineering practice, so that it can give a pratical reference value for floor crack width when reinforcement yielded.

关 键 词：极限荷载 裂缝宽度 塑性绞线 模型假定 粘结滑移 

分 类 号：TU375.2[建筑科学—结构工程]