大跨度钢桁梁桥整体吊装施工吊点布置研究

STUDY OF HOISTING POINTS ARRANGEMENT FOR INTEGRAL LIFTING CONSTRUCTION OF LONG-SPAN STEEL TRUSS BRIDGE

在大跨度钢桁梁桥整体吊装施工中,为了使结构杆件整体内力和变形较小,需要对吊点的布置位置进行合理选择,基于应变能最小原理对大跨度钢桁梁桥整体吊装施工中吊点的布置位置进行研究。通过建立96m简支钢桁梁桥吊装模型,在各自吊点的备选节点区域内进行吊点变量组合,确立整体应变能最小的吊点组合方式即为最优吊点布置方式。针对实际吊装施工中的最不利荷载工况,对比分析最优吊点布置方式和其他两种吊点布置方式下的吊装结构受力状态。计算结果表明:采用应变能最小原理选择的吊点布置方式,吊装结构的受力状态更加合理。

During the integral lifting construction of long-span steel truss bridge,it is necessary to select the lifting points reasonably,which can make the overall structures internal force and deformation smaller.The hoisting points arrangement for integral lifting construction of long-span steel truss bridge based on minimum strain energy principle was studied.Through the establishment of a 96 msimply supported steel truss bridge lifting model,the variable association for hanging points in an alternative area of each hoisting point were carried out.As a result,the overall strain energy minimization of hoisting points was the optimal arrangement.According to the most unfavorable load case,comparative analysis of the stress state of hoisting structure between the optimum hoisting points arrangement and other two suspension points arrangement schemes.The results showed that the optimal hoisting points arrangement was selected based on strain energy minimization principle,the stress state of the lifting structure was more reasonable.