混凝土自锚式悬索桥的恒载平衡状态分析

The Equilibrium State Analysis for Concrete Self-Anchored Suspension Bridge Under Dead Load

为获得混凝土自锚式悬索桥的理想恒载状态,为施工阶段倒拆分析提供理论依据,针对混凝土自锚式悬索桥的结构特点,以国内某跨径布置为(65+158+65)m的混凝土自锚式悬索桥为背景,基于有限位移理论和分段悬链线法计算理论,运用有限元软件ANSYS对其在结构自重、混凝土收缩徐变效应以及预应力效应等作用下的恒载平衡状态进行分析,得到混凝土自锚式悬索桥的合理线形和受力状态。研究结果表明:该方法所得主缆在恒载作用下的成桥线形合理、吊索索力及主梁的受力合理,为混凝土自锚式悬索桥的设计、分析及施工控制提供理论依据。

In order to obtain the ideal dead load state of the concrete self-anchored suspension bridge and provide the theoretical basis for the back running analysis during the construction, according to the structural characteristics of the concrete self-anchored suspension bridge and under the background of the concrete self- anchored suspension bridge with a （65 ＋ 158 ＋ 65 ） m span arrangement, the finite element software ANSYS is used to analyze the equivalent load state under the action of the structure weight, the effect of the concrete shrinkage, creep and the pre-stress based on the finite displacement theory and the calculation theory of the segmental catenary method, resulting in the reasonable linear and stressing state of the concrete self-anchored suspension bridge. The research result shows that the main cable curve obtained under the action of the equivalent load by this method is reasonable, and the stress of the cable force and the main girder is reasonable either, so that this method can provide the theoretical basis for the design, analysis and construction control of the concrete self-anchored suspension bridge.