分步算法确定叠合梁斜拉桥合理成桥索力

Method of Calculating Step by Step to Determine the Rational Completion Cable Forces of Cable-stayed Bridges

叠合梁斜拉桥的主梁是一种组合结构,在确定合理成桥索力时,与其他类型的斜拉桥有着不同之处。文中针对叠合梁斜拉桥的特点,结合具体算例,采用平面双层框架模型模拟主梁,根据零位移法初定一个成桥索力,在此基础上考虑恒载和活载的共同作用,根据应力平衡法确定主梁弯矩的合理恒载可行域,再根据索力对主梁弯矩的影响矩阵进行索力调整。所得索力更加符合斜拉桥的要求。

The main beam of composite beam cable-stayed bridge is a unit construction. When determining the rational completion cable forces, it is different from others. In this paper, against the characteristic of composite beam cable-stayed bridge, combining specific example, simulating the main beam with plane double-deck frame model, firstly a completion cable force is determined by Zero displacement method, then considering the combined action of dead-load and live-load, the rational feasible zone of flexural torque of the main beam is determined by stress balance method. Lastly the cable force of the main beam is adjusted according to the influence matrix of cable force. The cable force determined by this method is more rational.