桥头搭板受力分析及影响因素研究

Study on Force Analysis and Influence Factors of Approach Slab at Bridge Head

以某桥的桥头搭板为工程背景,采用Midas FEA建立非线性实体有限元模型,对桥头搭板的结构受力进行了计算分析,同时分析了板底脱空长度和地基承载能力对桥头搭板受力状况的影响。计算分析表明:随着板底脱空长度的增加和地基反应模量的降低,桥头搭板的挠度、应力、裂缝宽度将逐渐增加;当桥头搭板的板底脱空长度达到一半以上时,桥头搭板的受力状况将发生严重劣化;当地基反应模量低于100 MN/m^(3)时,桥头搭板将出现裂缝。

Based on the engineering background of a bridge approach slab in Wufeng Tujia Autonomous County,Hubei Province,the nonlinear solid finite element model is established by Midas FEA,and the structural stress of the approach slab is calculated and analyzed.At the same time,the influence of slab bottom void length and foundation bearing capacity on the stress condition of approach slab is analyzed.The results show that the deflection,stress and crack width of approach slab increase with the increase of slab bottom void length and the decrease of foundation response modulus.When the length of slab bottom of bridge head slab is more than half,the stress condition of bridge head slab will be seriously deteriorated.When the foundation response modulus is less than 100 MN/m^(3),cracks will appear in the approach slab.