基于吊索重要性的大跨度悬索桥冗余度分析

发布时间：2019-01-07 19:48

【摘要】：为分析悬索桥运营期间不同吊索的失效对悬索桥冗余度的影响,以某在建大跨度悬索桥为计算实例,利用悬索桥吊索失效前后整体结构的应变能变化,确定吊索的重要性系数。依据重要性系数对吊索进行失效组合,确定组合构件的失效情况,对各类最不利损伤状况的悬索桥冗余度进行定量计算,并结合损伤结构的应力增量,提出基于吊索重要性系数的悬索桥冗余度分析方法。结果表明:越靠近跨中的吊索失效对悬索桥的冗余度影响越大,对重要性系数较大的吊索进行组合失效状况模拟,发现当冗余度小于0.201时,桥梁的应力变化巨大,且有发生整体倒塌的趋势,不再适于继续承受荷载。
[Abstract]:In order to analyze the influence of the failure of different slings on the redundancy of the suspension bridge during the operation of the suspension bridge, taking a long-span suspension bridge under construction as an example, using the strain energy change of the whole structure before and after the suspension bridge failure, the importance coefficient of the sling is determined. According to the coefficient of importance, the failure combination of slings is carried out to determine the failure situation of the composite members, and the redundancy of suspension bridges with the most adverse damage conditions is calculated quantitatively, and the stress increment of damaged structures is combined. A method for analyzing the redundancy of suspension bridges based on the sling importance coefficient is presented. The results show that the failure of slings closer to the middle of span has greater influence on the redundancy of suspension bridges. The combined failure conditions of slings with larger importance coefficient are simulated. It is found that the stress of the bridge changes greatly when the redundancy is less than 0.201. And there is a trend of overall collapse, no longer suitable to continue to bear the load.
【作者单位】：天津大学建筑工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：国家自然科学基金项目(51578370) 天津市应用基础与前沿技术研究计划项目(14JCYBJC21500)
【分类号】：U448.25

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