独塔非对称自锚式悬索桥合理约束体系研究

自锚式悬索桥通过主缆与加劲梁锚固结合的方式,形成闭合传力路径。主缆的水平分力通过锚固区逐渐传递到主跨加劲梁,竖向分力则主要通过边跨自重平衡。在静力情况下,主梁为超静定体系；在动力情况下,通常为全漂浮或者半漂浮体系来达到减隔震目的。这样就会造成主梁约束转变的情况,这个问题在独塔非对称自锚式悬索桥中尤为凸显。本文以太原市通达街跨汾河的四跨独塔非对称自锚式悬索桥为背景工程,建立全桥有限元模型,分析了全桥在静力及动力情况下不同约束体系对全桥受力的影响,为今后同类型结构设计提供依据。

Study on Reasonable Restraint System of Single-pylon Asymmetric Self-anchored Suspension Bridge

Self-anchored suspension bridges utilize anchorage structure combining main cable and stiffening girder to form a closed force path. Horizontal force of the cable is transported to main-span girder while the vertical component is balanced by self-weight of side-span girder. The main-span girder is a statically indeterminate structure on static analyses. But on dynamic analyses, it is usually designed to be full floating or semi floating system for seismically isolating. This will result in a change in restraint system. This problem is particularly prominent in the asymmetric self-anchored suspension bridge with single tower. Based on the four-span single tower self-anchored suspension bridge at Tongda Street in Taiyuan city, a finite element model of the whole bridge was established. The influence of different restraint systems on the whole bridge under static and dynamic conditions is analyzed and provides some reference in the future designs.