基于斜拉式人行天桥荷载试验的有限元分析

以某斜拉式钢结构人行天桥结构为研究对象,对其进行了静载试验和有限元分析,得出以下结论:墩柱位置出现压应力,而梁中部则出现拉应力;在最不利形式试验荷载工况下,实测桥墩处箱梁两端压应变最大,在试验荷载作用下主梁、墩塔和索塔的截面应力实测值均小于理论计算值,应力校验系数小于1.0,说明结构强度满足设计要求,在试验荷载下有一定安全储备,结构安全可靠;有限元分析能有效运用于斜拉式钢结构天桥的整体结构安全评价中。

FINITE ELEMENT ANALYSIS OF CABLE-STAYED PEDESTRIAN BRIDGE BASED ON LOAD TEST

A cable-stayed steel pedestrian bridge structure was studied through static load test and finite element analysis. The following conclusions were drawn： compressive stress occurred near the pier and the tensile stress occurred in the central of beam. Under the worst adverse load, the measured maximal compressed strain occurred in both ends of the beam near the pier. The measured stress of the girder, pier and tower were less than theoretical calculation value in the test loads. Which satisfied the stress coefficient that was less than 1.0, showing that the strength of the structure could meet the design requirements. The bridge had certain safety margin in the experimental load. The structure was safe and reliable. The finite element analysis could be effectively used in the safety evaluation of the overall structure for cable-stayed type steel structure bridges.