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.
出处
《公路工程》
北大核心
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)
关键词
柔性系杆
更换方案
可靠度
flexible tied bar
replacement scheme
reliability
