基于可靠度的柔性系杆更换研究  

Replacent Scheme Analysis of Flexible Tied Bar Based on Reliability Theory

作　　者：唐辉 崔秀鹏 高燕梅[3] 周志祥[3,4] 

机构地区：[1]中交路桥技术有限公司,北京100011 [2]北京中交华联科技发展有限公司,北京100101 [3]重庆交通大学土木建筑学院,重庆400074 [4]山区桥梁与隧道工程国家重点实验室培育基地,重庆400074

出　　处：《公路工程》2016年第6期29-35,共7页Highway Engineering

基　　金：科技部973计划(国家重点基础研究发展计划项目2012CB723300)

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。Flexible tied bas is the key structure of arch bridge, which prestress loss has an important impact on the reliability of bridge, to find out a resonable replacing sechem, this paper relies on a concrete filled steel tube flexible tied arch bridge with span arrangement of 46 m ＋ 202 m ＋ 46 m as the engineering background, assume 10% prestress loss as the initial state, 6 replacement schemes are put forward. By using JC and PNET method, the reliability changes of the bridge is analyzed under each scehmes. Results show that scehme 1 and 2 are excutable, scheme 2 can shorten the construction time and ensure the safety, which makes it the final scheme.

关 键 词：柔性系杆 更换方案 可靠度 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]