摘要
新型的双主梁钢板组合梁,钢板主梁间距较大,桥面板正应力在横桥向的分布更加不均匀,为了进一步研究钢板组合连续梁桥桥面板在车辆荷载作用下的剪力滞效应,采用有限元软件Midas/FEA进行了建模分析。着重研究了车辆荷载在横向与纵向作用位置变化时,对混凝土桥面板剪力滞效应的影响。结果表明:随着车辆荷载纵向作用位置的变化,不同工况下的剪力滞系数变化规律不尽相同,其中对车辆荷载纵向作用位置最敏感的截面是支点处截面以及正负弯矩变化的交界处;车辆荷载横向作用位置的变化对剪力滞影响较大,作用位置处的剪力滞系数在偏载时达到最大。因此,在设计阶段,应充分考虑车辆荷载作用位置变化对双主梁式钢板组合梁桥剪力滞效应的影响。并且对于这类宽跨比较大的桥型,当采用规范给出的有效宽度划分梁格时,对其应力做出修正。
A new type of steel plate composite beam has a large spacing between the steel main girder and the stress distribution of the deck plate in the transverse direction of the bridge is uneven.In order to study the shear lag effect of deck slab of steel plate composite continuous girder bridge under wheel load,the finite element software Midas/FEA is used to model and analyze the system.The influence of vehicle load on shear lag effect of concrete bridge slab is studied when the vehicle load changes in the transverse and longitudinal position.The results show that with the change of the longitudinal position of vehicle load,the variation of shear lag coefficient is not exactly the same under different working conditions.The most sensitive section to the longitudinal position of vehicle load is the support section and the junction of the change of positive and negative moment.The variation of transverse position of vehicle load has a great influence on the shear lag,and the shear lag coefficient at the position of vehicle load reaches the maximum when the load is biased.Therefore,in the design stage,the effect of the change of the load position of the vehicle on the shear lag effect of the double girder type steel plate composite beam bridge should be fully considered.The stress of this kind of bridge is modified when the effective width of the gauge is used to divide the beam lattice.
作者
张玥
郭劲岑
Zhang Yue;Guo Jincen(College of Civil Engineering,Inner Mongolia University of Science and Technology,014010,Baotou,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2019年第3期741-746,768,共7页
Chinese Journal of Applied Mechanics
关键词
连续梁桥
钢板组合梁桥
车辆荷载
剪力滞效应
梁格法
有效宽度
continuous bridge
steel plate composite beam bridge
vehicle load
shear lag effect
grillage method
effective width
