超长混凝土结构温度效应的有限元分析

Finite Element Analysis on Thermal Effect of Super-long Concrete Structure

利用有限元分析软件ABAQUS,研究了超长混凝土结构在整体降温作用下板中应力和柱底弯矩的分布规律。通过参数分析,探讨了板中普通钢筋配筋率和预应力筋的强度、布置形式与直径对温度效应的影响规律。分析表明,均匀增加板中普通钢筋配筋率对控制温度应力效果不显著,预应力筋的布置形式不影响预应力的作用效果,通过改变预应力筋的强度和直径可以有效控制结构中的温度应力。

The finite element analysis software ABAQUS was used to study the distribution regularities of stress in the slab and bending moment at the bottom of the columns under cooling conditions. The influ- ence rules of common reinforcement ratio in the slab, the strength, layout form and diameter of prestressing tendons upon thermal effect were discussed through parametric analysis. The result shows that an even in- crease of common reinforcement ratio in the slab cannot control the thermal stress significantly and the layout form of prestressing tendons does not change the effect of prepressing. The thermal stress can be controlled effectively by changing the strength and diameter of prestressing tendons.