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用BEAM 188梁单元和SHELL 181壳单元建立了两种可考虑荷载作用位置的有限元模型,相互验证了模型的正确性.通过对两种荷载模式下U形截面无铰和两铰圆弧拱计算结果的比较,研究了支座类型、荷载模式和矢跨比对钢拱平面外屈曲的影响.对于理想的支座约束,发现径向均布荷载作用下两铰拱平面外屈曲荷载与无铰拱相同,竖向均布荷载作用下两铰拱平面外屈曲荷载在较大矢跨比时明显高于无铰拱;由于两铰与无铰拱的支座构造不同,满足什么条件平面外约束可按无铰对待有待研究.通过对加缀板与加隔板U形截面两铰圆弧拱平面外屈曲荷载的比较,发现加缀板形成间断闭合截面对屈曲荷载提高更显著,且用料少、施工简单.
Two kinds of finite element models which can consider the location of load are established by BEAM188 beam element and SHELL1881 shell element, which verify the correctness of the model.According to the two load modes, The results show that the type of support, the mode of load and the ratio of sag to span in plane flexural deformation of steel arch are studied.For the ideal abutment constraint, it is found that the out-of-plane buckling load of two hinged arch with radial uniform loading The out-of-plane buckling loads of two hinged archs under the same and vertical uniform load are obviously higher than those of the non-hinged archs at the larger ratio of transverse to spine. Because of the different bearing structures of the two hinges and the non-hinged arch, what conditions are satisfied? Can be treated as a hingeless to be studied.By comparing the plane buckling load of the two panels with U-shaped cross-section and the baffle plate, it is found that the intermittent closed section with the domed board increases the buckling load significantly, and the material Less, construction is simple.