基于可靠度的柔性系杆更换研究
发布时间：2019-06-13 10:09
【摘要】：柔性系杆作为系杆拱桥的关键构造,其索力损失必然对桥梁的可靠性能造成重要影响,索力损失到一定程度需及时进行更换。依托某跨径跨布置为46 m+202 m+46 m柔性系杆飞燕式钢管混凝土拱桥,以系杆索力损失10%为初始状态,提出4种系杆更换方案(单侧同时更换1根、2根、3根、4根,上下游侧同时进行更换),采用一次二阶矩(JC)法及PNET法,分析了不同方案下桥梁构件及体系的可靠度变化规律。结果表明:方案1、2均可行,方案1安全但施工步骤多,方案2能够保证桥梁的最低安全等级,同时尽可能缩短施工时间,建议采用方案2。
[Abstract]:As the key structure of tied arch bridge, the loss of cable force will inevitably have an important impact on the reliable performance of the bridge, and the loss of cable force to a certain extent needs to be replaced in time. Based on the 46 m 202 m 46 m flexible tied steel tube concrete filled steel tubular arch bridge with a span of 46 m 202 m 46 m, four kinds of tie rod replacement schemes (one side, two, three, four, upstream and downstream side replacement) are put forward, and the reliability variation law of bridge components and systems under different schemes is analyzed by using the first order second moment (JC) method and PNET method. The results show that scheme 1 and 2 are feasible, scheme 1 is safe but the construction steps are many, scheme 2 can ensure the minimum safety level of the bridge, and shorten the construction time as much as possible. It is suggested that scheme 2 should be adopted.
【作者单位】： 中交路桥技术有限公司;北京中交华联科技发展有限公司;重庆交通大学土木建筑学院;山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：科技部973计划(国家重点基础研究发展计划项目2012CB723300)
【分类号】：U445.7
[Abstract]:As the key structure of tied arch bridge, the loss of cable force will inevitably have an important impact on the reliable performance of the bridge, and the loss of cable force to a certain extent needs to be replaced in time. Based on the 46 m 202 m 46 m flexible tied steel tube concrete filled steel tubular arch bridge with a span of 46 m 202 m 46 m, four kinds of tie rod replacement schemes (one side, two, three, four, upstream and downstream side replacement) are put forward, and the reliability variation law of bridge components and systems under different schemes is analyzed by using the first order second moment (JC) method and PNET method. The results show that scheme 1 and 2 are feasible, scheme 1 is safe but the construction steps are many, scheme 2 can ensure the minimum safety level of the bridge, and shorten the construction time as much as possible. It is suggested that scheme 2 should be adopted.
【作者单位】： 中交路桥技术有限公司;北京中交华联科技发展有限公司;重庆交通大学土木建筑学院;山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：科技部973计划(国家重点基础研究发展计划项目2012CB723300)
【分类号】：U445.7
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