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采用空间有限元方法对刚性悬索加劲钢桁梁桥的施工全过程进行了仿真分析,通过变化边界条件与施加节点强制位移分别模拟结构体系转换和内力调整,采用释放纵梁一端的纵向刚度来模拟纵梁长圆孔的影响,对比了6种主要工况下结构的内力和位移。分析结果表明:通过体系转化和内力调整,能有效地使刚性悬索与钢桁梁共同受力;横、纵向内力调整能使结构的中边桁与中边跨的内力差异减小到5%以内;在纵梁两端设置长圆孔能有效避免其过早参与纵向受力,仅使整体结构的内力与挠度增加10%左右,但使得纵梁与横梁的最大组合压应力分别从-271.1-、505.8 MPa降低到-63.0、-178.0 MPa,小于材料的容许应力210 MPa。
The finite element method is used to simulate the whole process of the rigid suspension bridge with steel truss and girder bridge. The structural system transition and internal force adjustment are simulated respectively by varying the boundary conditions and forced displacement of the applied node. The longitudinal stiffness of one side of the longitudinal beam is released Simulating the influence of the long hole of the longitudinal beam, the internal forces and displacement of the structure under six main conditions are compared. The results show that the rigid suspension cable and the steel truss girder can be effectively forced by system transformation and internal force adjustment. The lateral and longitudinal internal force adjustment can reduce the internal force difference between the center-side girder and the mid-span of the structure to 5% Of the total length of the longitudinal beam can be effectively prevented from premature participation in the longitudinal force, only increasing the internal force and deflection of the overall structure by about 10%, but the maximum combined compressive stress of the longitudinal beam and the transverse beam increases from -271.1- , 505.8 MPa reduced to -63.0, -178.0 MPa, less than the allowable stress of the material 210 MPa.