曲线斜拉桥锚固点与支座偏移受力影响

曲率的影响使曲线斜拉桥受力复杂,可采用主梁锚固点偏移、主塔锚固点偏移以及支座偏移等特殊构造改善其力学性能。以龟韭沟大桥为例,采用有限元方法,分析了曲线斜拉桥主梁和主塔锚固点向曲线外侧、主墩支座向曲线内侧偏移对结构受力的影响。结果表明:曲线斜拉桥主梁和主塔锚固点及主墩支座偏移对曲线内外侧斜拉索索力差、主塔塔顶横向位移、主梁横梁弯矩的影响均呈线性趋势。

Influence Analysis on Anchorage and Bearing Offsets of Curved Cable-Stayed Bridge

Curved cable-stayed bridge is complex in stress due to curvature.Special structures such as main beam anchorage offsets,main tower anchorage offsets and bearing offsets are available to improve the mechanical state of the bridge.Based on Guijiugou Bridge,the influences of main beam and main tower anchorage with offsets toward outboard curve and the main pier bearing with offsets toward inboard curve on mechanical state of curved cable-stayed bridge are analyzed by FEM.The results show that the influences of all the offsets on the differences of cable-tensions of the two sides of the curve,the transverse deflections of towers and the influences of bending moments of crossbeam are all in linear tendency.