基于影响矩阵法拱桥吊杆破断安全性评估
Safety Evaluation of Arch Bridge Suspender Breaking Based on Influence Matrix Method
胡志坚 1王登华 2周知 1夏雷雷1
作者信息
- 1. 武汉理工大学交通与物流工程学院 武汉,430063
- 2. 武汉理工大学交通与物流工程学院 武汉,430063;成都市建筑科学研究院有限公司 成都,610051
- 折叠
摘要
根据成桥索力确定拱桥关键吊杆位置,采用影响矩阵法分析关键吊杆断裂后剩余吊杆和主纵梁的内力变化,从剩余吊杆损伤和纵梁数量变化两方面对结构的安全性能进行研究,并以某中承式拱桥为背景工程验证了本研究方法的有效性和关键结构参数取值的合理性.结果表明:影响矩阵法能较为准确地分析出关键吊杆破断后剩余吊杆和主纵梁的内力变化情况;吊杆损伤主要影响剩余吊杆的安全性,当剩余吊杆截面损伤程度大于50％时,易出现连续断索事故;对于30多米宽的桥面系,布置2道主纵梁、3道次纵梁可以满足主纵梁在吊杆断裂后的安全性能储备.
Abstract
The cable force of the finished bridge is analyzed to determine the critical suspender position of the arch bridge.The influence matrix method is then employed to analyze the internal force changes in the remaining suspenders and the central longitudinal beam following the rupture of a key suspender.The safety performance of the structure is studied in two aspects:the damage to the remaining suspenders and the alteration in the num-ber of longitudinal beams.Finally,the effectiveness of the research method and the significance of the critical structural parameters are verified by taking a half-through arch bridge as the background project.The results show that the influence matrix method can accurately analyze the internal force changes in the remaining suspend-ers and the central longitudinal beam following the rupture of a key suspender.Damage to the remaining suspend-ers mainly affects the safety of the remaining suspenders.When the sectional damage degree of the remaining suspenders exceeds 50％,continuous cable breakage is likely to occur.For bridge deck system exceeding 30 me-ters in width,the safety performance reserve of the central longitudinal beam after the suspender is broken can be satisfied with an arrangement consisting of two main longitudinal beams and three secondary longitudinal beams.
关键词
拱桥/吊杆破断/影响矩阵法/安全性评估Key words
arch bridge/breaking of suspenders/influence matrix method/security assessment引用本文复制引用
出版年
2024
NETL
NSTL
万方数据