大跨径混凝土自锚式悬索桥非线性静力分析

Nonlinear Static Analysis of Long-span Concrete Self-anchored Suspension Bridge

介绍了自锚式悬索桥受力特点及其非线性分析理论,并以某一混凝土自锚式悬索桥为例,考虑主缆大位移、主梁和主塔的P-Δ效应、主缆吊索的初应力以及混凝土的收缩徐变等非线性因素的影响,对以下5种荷载组合:组合I(恒载+公路—I级+人群荷载)、组合II(恒载+公路—I级+人群荷载+收缩徐变)、组合III(恒载+公路—I级+索降温)、组合IV(恒载+公路—I级+整体升温)、组合V(恒载+公路—I级+主梁温差)进行了非线性力学性能分析。计算结果表明该桥力学性能满足设计规范要求。分析比较了结构参数及形式的变化对桥梁受力性能的影响,所得结论对同类桥梁的研究有一定的参考性。

In this paper, the mechanical characteristics of seff-anchored suspension bridge are described and the nonlinear analysis theory is also introduced. The indices of structural mechanics under static load were obtained in terms of the cable＇ s large deflection, the P-△ effect of main girder and pylon, the initial strain of cable and suspender, and the concrete＇ s creep and shrinkage by taking one self-anchored suspension bridge as a case study. The effects of five different load combination cases, combination Ⅰ （ dead load ＋ highway-Ⅰ load ＋ crowd load）, combination Ⅱ （ dead load ＋ highway-Ⅰ load ＋ crowd load ＋ creep and shrink）, combination Ⅲ （ dead load ＋ highway-Ⅰ toad ＋ cable cooling）, combination Ⅳ （ dead load ＋ highway-Ⅰ load ＋ overall warming）, and combination Ⅴ （ dead load ＋ highway-Ⅰ load ＋ girder temperature difference）, were analysed. Results indicate the mechanical properties of the bridge meet the requirements of design specification. Moreover, the influences of structural parameters on the mechanical characteristics of the bridge＇ were also studied. Some conclusions could provide some references for the analysis of self-anchored suspension bridges.