某预应力连续梁桥底板崩裂后的加固方法及其有限元分析

Reinforcement method and finite element analysis of bottom slab with bursting cracks of a prestressed continuous beam bridge

某大跨连续梁桥主跨跨中段进行预应力筋张拉后,由于部分定位钢筋未安装到位,跨中底板混凝土在预应力径向力作用下出现崩裂现象。针对该情况下的开裂现象提出了加固方案,并采用ANSYS建立该桥局部模型模,对需修复梁段的底板及顶板在加固设计方案中不同阶段的受力情况进行模拟及计算分析,确定该加固方案可行有效。

Because some positioning bars are not installed in place, after prestressed tension, the bursting cracks occurred in the mid-span bottom slab of a long-span continuous bridge under the effect of prestressed radial force. This thesis puts forward the reinforcement scheme for this cracking phenomenon, and uses ANSYS to build the partial models of this bridge. The force condition of the bottom and roof beams which need repair were simulated and computational analysis at different stages in the design of reinforcement to determine the reinforcement scheme is feasible and effective.