非对称三拱肋异型系杆拱桥汽车荷载作用效应分析  

Analysis of Vehicle Load Effects on Asymmetric Three-Arch Rib Special-shaped Tied-Arch Bridge

作　　者：陈占毅 CHEN Zhanyi(Guangzhou Road Affairs Center,Guangzhou,Guangdong 510000,China)

机构地区：[1]广州市道路事务中心,广东广州510000

出　　处：《黑龙江交通科技》2024年第12期76-82,共7页Communications Science and Technology Heilongjiang

摘　　要：秦淮湾大桥为一座非对称三拱肋异型系杆拱桥,且钢箱梁较宽,在汽车荷载作用下桥梁的空间应力分布较为复杂。基于精细化的实体有限元模型,考虑全桥对称加载、全桥偏载、单侧偏载三种汽车荷载分布形式,计算在不同荷载分布形式下主梁纵、横向应力、挠度以及吊杆索力的影响。计算结果对比分析表明:全桥偏载工况引起主梁顶、底板应力响应最大,尤其拱脚与主梁顶、底板交界位置;单侧偏载下扭转程度较大,扭转角为0.040°;C索面吊杆在汽车荷载作用下响应最大,后期应重点关注C索面索力变化。The Qinhuaiwan Bridge is an asymmetric three-arched rib special-shoped tied-arch bridge with a wide steel box girder.Under the action of vehicle loads,the spatial stress distribution of the bridge is quite complex.Based on a refined solid finite element model,three types of vehicle load distribution patterns were considered:symmetric loading across the entire bridge,eccentric loading across the entire bridge,and unilateral eccentric loading.The effects of longitudinal and transverse stresses,deflections,and hanger forces in the main beam under different load distribution patterns were calculated.The comparative analysis of the calculated results indicates that the eccentric loading condition across the entire bridge leads to the maximum stress response in the top and bottom flanges of the main beam,especially at the junction of the arch foot with the top and bottom flanges of the main beam.Under unilateral eccentric loading,the degree of torsion is relatively large,with a torsional angle of 0.040°.The hangers on the C cable plane show the greatest response to the action of vehicle loads,and changes in the forces of the C cable plane should be closely monitored in the later period.

关 键 词：桥梁 汽车荷载 应力 挠度 索力 

分 类 号：U445[建筑科学—桥梁与隧道工程]