摘要
为改善大跨度悬索桥在运营阶段的结构受力状态,一般在悬索桥跨中设置中央扣构造。中央扣与主梁连接处板件数量多、交错布置,结构构造和传力复杂。为了明确大跨度悬索桥跨中主梁与中央扣连接处板件的力学特点,以济南市凤凰路黄河大桥的主跨428 m自锚式悬索桥为背景,建立能实现主梁与中央扣连接节点处局部受力分析的板壳-杆系混合有限元子结构模型,计算不同荷载工况下的主梁与中央扣连接节点板件的受力特性,揭示中央扣构件轴力在主梁与中央扣连接节点的传力机理。结果表明:该桥主梁与中央扣连接节点各板件受力主要由恒载控制,活载仅占恒载的15%;中央扣区主梁腹板和横隔板剪力主要参与了中央扣轴力的传递,参与程度达到80%以上。
A central buckle structure is generally set in the mid-span of long-span suspension bridge to improve the structure mechanical state during the service time.The number of the plates at the girder-central buckle joint is large and the local structure is intricately complicated,with complex structure and force transmission.In order to clarify the mechanical characteristics of the plates at the girder-central buckle connection region of the long-span suspension bridge,a shell-beam hybrid finite element substructure model for analyzing the force and the stress of the girder-central buckle joint is established based on the 428 m main span self-anchored suspension bridge of Yellow River Bridge at Fenghuang Road in Jinan City.The internal force characteristics of the plates of the girder-central buckle joint under different loads are calculated,and the transmission mechanism of the central buckle axial force at the girder-central buckle joint is revealed.The result shows that(1)the force of the plates at the girder-central buckle joint is mainly controlled by the dead load,and the force caused by live load only accounts for 15%of the force caused by dead load;(2)in the central buckle region,the shear force of webs and diaphragms of the girder mainly participate in the transmission of the central buckle axial force,and the participation degree is more than 80%.
作者
牟晓岩
牛勇
侯守军
陶延军
李革新
MU Xiao-yan;NIU Yong;HOU Shou-jun;TAO Yan-jun;LI Ge-xin(Jinan City Construction Group Co.,Ltd.,Jinan Shandong 250000,China;Jinan Urban Construction Group Co.,Ltd.,Jinan Shandong,250000,China;Shandong Yifangda Construction Project Management Co.,Ltd.,Jinan Shandong 250000,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2021年第S01期1-8,共8页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
大跨度悬索桥
有限元模型
主梁与中央扣连接节点
传力机理
bridge engineering
long-span suspension bridge
finite element model
girder-central buckle joint
force transmission mechanism
作者简介
牟晓岩(1966-),男,山东潍坊人,正高级工程师.(chengjian9922@163.com)
