巴基斯坦某框架式地道桥受力性能分析
Mechanical Performance Analysis of a Frame Underpass Bridge in Pakistan

本文采用厚板理论，对巴基斯坦某洞口带翼墙的斜交框架式地道桥进行受力性能分析，通过依次上调15%设计参数，研究在恒荷载和移动荷载作用下斜交角对地道桥内力、应力、位移等力学参数的影响。研究发现，顶板的纵向弯矩随斜交角增大而增大，平均增大幅度为8.89%。顶板的横向弯矩、顶板的竖向位移、顶板上部最大主应力、翼墙与立墙连接部位最大主应力，均随斜交角增大而减小，其中应力和位移的平均减小幅度较大，分别为43.5%和8.65%。针对顶板钝角区域出现较大负弯矩的现象，提出布置相应加强筋的方案。
Based on the thick plate theory, this paper analyzes the mechanical performance of skew frame underpass bridge in Pakistan with wing wall at the portal. By increasing the design parameters by 15%, the influence of skew angle on the internal force, stress and displacement of Underpass Bridge under the action of dead load and moving load is studied. It is found that the longitudinal bending moment of the roof increases with the increase of the skew angle, with an average increase of 8.89%. The transverse bending moment of roof, vertical displacement of roof, maximum principal stress of upper part of roof and maximum principal stress of connecting part of wing wall and vertical wall all decrease with the increase of skew angle. The average reduction range of stress and displacement is 43.5% and 8.65% respectively. Aiming at the phenomenon of large negative bending moment in obtuse angle area of roof, the scheme of arranging corresponding reinforcing bars is put forward.