底框结构中协调扭转引起框架梁开裂的分析计算

Analysis of the crack in the frame gird of a basement-frame structure subjected to coordinated torsion

通过分析某底框结构中的框架梁端斜向裂缝产生的原因 ,提出了设计中通常忽略的扭转计算 ,导致底框大梁在扭矩、弯矩和剪力组合作用下发生扭剪开裂。探讨了梁协调扭转计算的方法 。

Based on the analysis of the diagonal crack in the frame gird of a basement frame structure,the authors think that the torsion,which is often neglected by the designer,is main cause to the torsion and shear crack in the gird of basement frame due to combined action of torque,moment and shear.In this paper,the calculation of coordinated torsion is also discussed and measures taken to prevent gird of basement frame from torsion and shear cracking are suggested.