无横撑系杆拱的面外稳定参数分析

当拱的侧向刚度较小，作用在拱上的荷载增加到一定程度后，在拱轴纵向将产生弯矩和扭矩，在它们的联合作用下，拱轴线会向侧向倾斜。当拱肋侧倾时，拱轴偏离其竖直平面，向空间弯扭形式的平衡状态转化，故通常在求其侧倾临界荷载时应用能量法，基本思想是先假定微小的空间弯扭位移函数，并以此位移位置作为侧倾的一个平衡状态来进行分析，用弹性系统平衡的能量法标志来求解临界荷载。本文采用有限元，对公式中的各项参数系杆拱侧倾稳定的影响进行详细的讨论，同时也和有限元的结果进行对比。

Cross struts tied arch bridge surface stability parameter analysis

When the arch of the lateral stiffness, the load acting on the arch to a certain extent,the longitudinal axis of the arch will have a moment and torque, in their combined effects, the arch axis tilted to the side. When the arch camber, arch axis deviation of the vertical plane, to the space bending form of equilibrium conversion, so often in the lateral critical loads using energy method, the basic idea is to assume that the tiny space bending displacement function, and thus the displacement position as a roll in an equilibrium state to undertake an analysis, elastic balance of system energy law mark to solve the critical load. This article uses the finite element formula, on the parameters of the tied arch roll stabilization effect are discussed in detail, and the results were compared with finite element method.