自锚式悬索桥恒载吊索力的设计方法研究

Research of Design Method for Dead Load Hanger Forces of Self-Anchored Suspension Bridges

基于内力平衡法,对自锚式悬索桥的成桥吊索力进行研究。首先用弯矩能量最小原理求出初步索力,然后利用索力得到恒载弯矩,利用挠度理论求出活载作用下结构的最不利弯矩,将恒载与活载弯矩叠加,获得结构的初步控制弯矩后,采用内力平衡法对弯矩和索力进行调整以得到合理的索力。

Based on the internal force equilibrium method, the hanger forces of completed self-anchored suspension bridges have been researched. In the research, the principle of minimum moment energy is firstly used to obtain the preliminary hanger forces and the hanger forces are in turn used to obtain the dead load moment. The deflection theory is then used to obtain the most unfavorable moment of the structure under live load, and after the preliminary controlling moment of the structure is obtained by superpositioning the dead and live load moment, the moment and hanger forces are to be adjusted by the internal force equilibrium method to finally obtain the rational hanger forces.