大跨度悬索桥钢桁架加劲梁等效刚度  

Equivalent stiffness of the steel truss stiffening girder of the longspan suspension bridge

作　　者：卓杰 曾加东 张志田 ZHUO Jie;ZENG Jiadong;ZHANG Zhitian(School of Civil Engineering and Architecture,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学土木建筑工程学院,海南海口570228

出　　处：《海南大学学报(自然科学版中英文)》2025年第1期59-66,共8页Natural Science of Hainan University

基　　金：国家自然科学基金重点项目(51938012);国家自然科学基金地区科学基金项目(52268073,52068020)。

摘　　要：针对钢桁架加劲梁等效惯性矩计算问题,以某大跨度悬索桥为工程背景,建立不同桁架构件参数的空间有限元模型,利用悬臂静力有限元法将主梁位移进行反算得到桁架等效截面惯性矩,总结其变化规律。根据计算结果,针对主要影响参数引入了无量纲拟合公式进行拟合。结果表明:主弦杆构件不同参数对等效抗弯惯性矩的影响可归结为主弦杆截面积参数的影响,表现为线性增加规律;但主弦杆构件不同参数改变对等效抗扭惯性矩的影响各不相同,并不能归结为截面积的影响。通过与不同参数下等效惯性矩的计算值的对比表明,无量纲拟合公式具有较好的精度,最大相对误差低于5%,可用于钢桁架主梁惯性矩的快速计算。In the report,aimed at the equivalent stiffness calculation of the steel truss girders,based on a longspan suspension bridge,the spatial finite element models of the different truss parameters were established.The static finite-element analysis of the cantilever models was performed to calculate the displacement of main beam,the equivalent section moment of inertia of truss was obtained,and the variation trends were analyzed.Based on the calculation data,aimed at the major parameters,the dimensionless formula was performed for fitting.The results indicated that the effects of the different parameters of the major chord member on the equivalent bending resistance moments of inertia can be summed up as the effects of the section area parameters of the main chord,and which increased linearly.However,the effects of the changes of the different parameters of the major chord on the equivalent torsion resistance moments of inertia were different,which could not be summed up as the effects of the section area parameters.Under the different parameters,the values of the equivalent moments of inertia were compared.The results showed that the precision of the fitted dimensionless formula was satisfied,the largest error was less than 5%,which can be used for the calculation of the moments of inertia of truss.

关 键 词：悬索桥 钢桁梁 有限元分析 等效惯性矩 拟合公式 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]