钢筋混凝土偏心受压构件裂缝宽度计算研究

为研究裂缝宽度验算规范解在偏心距处于0.55 h(h为构件截面高度)附近时不连续的问题,通过开裂换算截面法得到矩形偏心受压构件内力臂及钢筋应力理论解。对比现行规范解发现,规范公式在双侧配筋、配筋率或偏心距较小时计算内力臂值存在较大误差,影响裂缝计算结果;而当偏心距等于0.55 h且配筋率小于0.3时,理论上会有裂缝超过限值的情况发生。

Study on Crack Width Calculation of Reinforced Concrete Eccentric Compression Member

In order to study the problem of discontinuity in the normal solution of crack width when the eccentricity is around 0.55 h(hight of section),the theoretical solutions of internal force arm and reinforcement stress of rectangle eccentric compression member is obtained by cracking transformed section method.Compared with the current code solution,it is found that there is errors in the calculation of the internal force arm value by using the code formula,when symmetric reinforcement or the reinforcement ratio or eccentricity is small,which affects the calculation result of the crack.When the eccentricity is equal to 0.55 h and the reinforcement ratio is less than 0.3,the cracks may be exceed the limit value.