论文部分内容阅读
为了使悬索桥施工猫道静风响应的研究更加接近真实,利用大型有限元软件ANSYS,建立了澧水河特大悬索桥施工猫道的有限元计算分析模型,对猫道进行了非线性静风响应研究。在猫道节段模型的静力三分力试验的基础上,考虑猫道结构的几何非线性和静风荷载的非线性,采用增量与内外两重迭代相结合的方法,编制了精确求解施工猫道静风失稳的计算程序,进而对澧水河特大悬索桥施工猫道进行了三维非线性静风失稳分析。研究结果表明:向上的升力作用可使猫道承重绳的张力逐渐开始松弛,导致小跨猫道扭转刚度减小;猫道发生静力扭转失稳的原因为减小的扭转刚度不足以抵抗空气力矩作用。
In order to make the research on the static response of catwalk construction more realistic, a finite element analysis model of the construction catwalk of the Suishui River Suspension Bridge was established by using the large-scale finite element software ANSYS. The nonlinear static response of the catwalk was studied . Based on the static third component test of the cat section model and considering the geometrical nonlinearity of the catwalk structure and the nonlinearity of the static wind load, an accurate solution was obtained by combining the incremental and internal and external iterations The program of calculating the static instability of the catwalk was constructed, and then the three-dimensional nonlinear static wind instability analysis of the construction catwalks of the Xisui River Super Suspension Bridge was carried out. The results show that the upward lifting effect can gradually relax the tension of the cat rope and reduce the torsional stiffness of the catwalk. The static torsional instability of the catwalk is due to the insufficient torsional rigidity to resist the air Torque effect.