摘要
为提高系杆拱桥吊杆的设计安全和营运可靠性,基于桥梁破损安全设计的思想,提出采用非对称平行吊杆体系,以攀枝花保果金沙江大桥(主跨160m中承式柔性系杆刚性拱桥)为背景,对系杆拱桥的破损安全设计方法进行研究。运用Palmgren-Miner线性累积损伤理论,对非对称平行双吊杆体系的吊杆疲劳寿命进行预测分析,并采用ABAQUS有限元软件建立单、双吊杆体系的全桥有限元模型,对端部吊杆骤断时剩余吊杆的应力变化规律进行分析。结果表明,双吊杆的截面积差将会显著影响双吊杆之间的疲劳寿命差异,使2根吊杆具有明显不同的疲劳寿命;非对称平行双吊杆体系拱桥的安全性明显高于单吊杆体系拱桥,结构破坏安全设计理论应用于系杆拱桥的吊杆设计具有可行性。
To improve the design safety and service reliability of the hangers of tied arch bridge, the asymmetric parallel double hangers system was proposed for application to the bridge based on the idea of the bridge failure safety design. The Baoguo Jinsha River Bridge （a half- through rigid arch bridge with flexible tie members and with a main span of 160 m） in Panzhihua was cited as an example and the failure safety design method for the hangers of the tied arch bridge was studied. The fatigue life of the hangers of the asymmetric parallel double hangers system were predicted and analyzed, using the Palmgren-Miner linear cumulative damage theory, the finite ele- ment models for the whole bridge of the bridge with the single and/or double hanger（s） system were established, using the software ABAQUS and the stress changing laws of the remaining hangers of the bridge at the time of sudden break of the end hanger（s） were analyzed as well. The results of the analysis indicate that the sectional area differences of the double hangers will signifi- cantly influence the fatigue life differences of the hangers and will cause the two hangers to have the significantly different fatigue life. The safety of the tied arch bridge with the asymmetric paral- lel double hangers system is significantly higher than that of the tied arch bridge with the single hanger system and the application of the structural failure safety design theory to the design of the hangers of the bridge is feasible.
出处
《桥梁建设》
EI
CSCD
北大核心
2016年第1期35-39,共5页
Bridge Construction
关键词
中承式系杆拱桥
吊杆
破损安全设计
非对称平行双吊杆体系
吊杆骤断
疲劳寿命
有限元法
应力分析
half-through tied arch bridge
hanger
failure safety design
asymmetric parallel double hangers system
sudden break of hanger
fatigue life
finite element method
stress analysis
