摘要
本文改进了钢筋混凝土有限单元法中的裂缝计算方法，推导了等效单轴应变本构模型下的徐变计算公式，并对大峡尾水管肘管段设置封闭块和不设置封闭块两种工况进行施工期温度裂缝的仿真计算，通过对裂缝成因的分析和两种工况裂缝分布及裂缝宽度的对比，指出设置封闭块作用不大，而且不设封闭块裂缝宽度能满足要求，因此取消封闭块是可行的。
In the paper,the crack calculating method in RCFEM was modified and the new calculating method of creep suited to the equivalent uniaxial stress-strain relationship is presented. By RCFEM,the propagation of temperature cracks in two cases (with and without sealing block in the elbow section of draft tube in Daxia hydroelectric station) during construction were calculated. Analyzing the causes of cracking and comparing the propagation and width of cracks of these two cases, it is noted that the effect of the sealing block is insignificant and may be canceled.
关键词
钢筋混凝土
水电站
有限元计算
温度裂缝
尾水管
RC nonlinear finite element method, temperature stresses,temperature cracks,draft tube, sealing block
