基于土-钢共同作用模型的覆土波纹钢板拱桥施工过程受力分析

通过积分计算波纹钢板截面特性，并利用刚度等效的原则将其简化为平钢板，建立了平面二维土体与结构共同作用模型，计算分析了土体参数对结构受力的影响．采用有限元分析技巧，对一座实际波纹钢板拱桥的施工过程进行了模拟，计算分析了施工过程中关键截面的变形和内力变化规律．计算和分析结果表明，波纹板截面特性的积分算法具有很高的精度，通过刚度等效方法建立的土-钢共同作用模型可以考虑土与结构相互作用．施工过程的模拟结果说明，覆土波纹钢板拱桥施工过程中变形和内力变化较大，施工中应严格分层，对称回填、压实，并应特别注意覆土回填至拱顶附近时的位移和内力变化．

Mechanics Behavior of Buried Corrugated Steel Arch Bridge Based on Soil-Steel Interaction Mode During Construction

Buried corrugated steel plate arch bridges are widely used as highway and railway structures of small spans, which are so-called soil-steel bridges, and whose strength comes from the interaction between the soil and the corrugated steel components of the system. Firstly, an integral algorithm is adopted to calculate the section features of the corrugated steel plates. Then, the simplified 2D soil-steel interaction model is established by using the above section features and the method of equivalent circumferential bending rigidity. The influences of the various soil parameters are analyzed. The process of the buried construction is simulated by using the technique of FEM. The variation rules of stress and displacement of the key sections of the bridge during buried construction are derived. Calculated and analysis results show that the integral algorithm is accurate and the simplified 2D soil-steel interaction model can take consideration of the interaction of the soil and the corrugated steel plate. Simulation results of the buried construction process show that the stress and displacement different significantly during the buried construction process. Therefore, the layered and symmetrical compaction must be controlled strictly during the buried process, The stress and displacement of the corrugated steel plate arc must be paid more attention when the back fill is closed to the crown of the arch.