优化弦杆长细比对钢拱架结构行为的改善

摘要

将微调拼装式钢拱架的叉形腹板变换成菱形腹板构造出一种新的钢拱架型式,这种新构造出来的钢拱架在材料用量一样的情况下,其上、下弦杆的长细比仅为可微调拼装式钢拱架的一半。利用MIDAS软件建立两种钢拱架的空间有限元模型,对两种钢拱架在拱桥施工中的弦杆压应力进行了对比分析,得到新构造的钢拱架是更为优化的拱架结构型式。%A new type of steel arch centering is formed by changing the forked web of fine-adjustment steel arch centering into rhombic web, and the slenderness ratio of the newly formed steel arch centering is half of fine-adjustment steel arch centering while their steel consumption are equal. And then the author builds space finite element model of the two types of steel arch centerings by the use of software MIDAS, finally makes the structural comparative analysis in terms of the compressive stress of chord; the result is obtained as follow： the steel arch eenterings newly formed is more optimal than the type of fine-adjustment