论文部分内容阅读
对设置连续和不连续斜撑的平面桁架拱的平面外弹性屈曲性能进行研究。首先,研究连续斜撑平面桁架拱,得到一个理论上的平面外弹性屈曲荷载的封闭解。通过有限元法分别研究不连续支撑平面桁架拱的两个重要参数——斜撑阈值刚度和相邻支撑间一段拱的平面外弹性屈曲荷载。此外,有限元结果显示,如果平面桁架拱由在腹杆与弦杆间使用相贯节点制作而成且受上弦杆约束,那么受刚度不足的影响,下弦杆的外平面屈曲可以完全避免平面桁架拱产生外平面屈曲,之后桁架拱会完全受上弦杆所约束。
The out-of-plane elastic buckling behavior of a plane truss arch with continuous and discontinuous braces is investigated. First, a continuous truss arch truss arch was studied to obtain a theoretical closed-form solution of out-of-plane elastic buckling loads. The two important parameters of discontinuous support plane truss arch are studied respectively by finite element method: the threshold stiffness of diagonal braces and the out-of-plane elastic buckling load of a section of arch between adjacent supports. In addition, the finite element results show that if the plane truss arch is made of a cross-web between the web and the chord constrained by the upper chord, the outer plane buckling of the lower chord can completely avoid the effects of the plane truss The arch produces an out-of-plane buckling, after which the truss arch is completely restrained by the winding rod.