空心板桥拓宽后新旧板耦合受力分析  

Analysis on Coupling Force of New and Old Beams After Widening Hollow Slab Bridge

作　　者：赵宝俊[1,2] 党智平 朱郭瑞 孟江[1] 

机构地区：[1]长安大学交通运输工程博士后流动站,陕西西安710064 [2]陕西省交通建设集团公司,陕西西安710075 [3]陕西省住房和城乡建设厅执业资格注册中心,陕西西安710004

出　　处：《建筑科学与工程学报》2016年第1期61-66,共6页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51308055)

摘　　要：为了研究拼接拓宽空心板桥梁荷载横向传递及内力变形规律,建立有限元模型,对桥梁新旧板刚接和铰接连接形式下耦合受力情况进行分析,研究不同连接形式对新旧板整体受力的影响。结果表明:采用不同连接形式拓宽后,旧桥各板的横向分布系数均低于原板,即拓宽后旧空心板仍起控制作用,但其整体受力性能得到提高;拓宽后侧边板内力和挠度比中板大,且新板内力和挠度比旧板小;空心板桥梁采用刚接形式拓宽时,结构整体刚度的提升高于铰接形式的;随着耦合刚度增大,桥梁整体刚度增大,弯矩和挠度降低逐渐明显,跨中顶缘压应力减小,底缘拉应力增大;从结构整体受力和结构性能角度来看,刚接形式的新旧板顶缘压应力比铰接形式的小,且完全刚接的连接方式受力更合理。In order to study the effect of lateral load transfer and deformation rules of widening hollow slab bridge,the finite element model was established to analyze the new and old connection coupling force in different ways（hinged or rigid）,and the influences of different connections on the force of the new and old boards were studied.The results show that after using different connection form to widen,old bridge transverse distribution coefficient of each plate is lower than that of the original plate,it is showed that old plate still plays a controlling role after widening,but the overall mechanical performance is improved.The force and deflection of side plate is larger than that of the internal plate,and the force and deflection of new internal plate is smaller than that of the old one after widening.When hollow slab bridge is widened using rigid connection,the rise of the overall rigidity of the bridge is larger than that using hinged connection.With the increase of coupling stiffness,the overall rigidity of the bridge increases,bending moment and deflection decrease clearly,the top edge compressive stress decreases,and bottom flange tensile stress increases.In the view of structure stress and the overall structure properties,the compressive stress of the top edge is smaller than that using rigid connection,and fully rigid connection form of stress is more reasonable.

关 键 词：桥梁工程 空心板桥 拓宽 耦合受力 连接形式 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]