摘要
为研究吊杆拱桥考虑结构缺陷及交通量增加条件下受力特性,以攀枝花倮果金沙江大桥为工程背景建立有限元分析模型进行相关计算分析。首先介绍了系杆类桥梁常见损坏模式及其影响因素,然后以倮果大桥为研究对象分别对由拱肋线形缺陷、吊杆线形缺陷、吊杆失效以及交通量增加引起的吊杆力变化进行计算分析。结果表明:吊杆力对拱肋竖向缺陷比对横向缺陷更为敏感;吊杆线形缺陷对短吊杆的影响比对长吊杆更为显著,在短吊杆中容易激起较大的次生弯矩及剪力;单吊杆失效将显著改变临近杆件的力学特性,短吊杆区域较长吊杆区域失效蔓延速度更快。交通量增加加速了结构的疲劳破坏。
To study the mechanical performance of tied-arch bridge under structural defects and traffic increase,a limited element model of Panzhihua Luoguo Jinshajiang Bridge is established and analyzed. Firstly, common damage models and their influence factors are presented. Then, based on established engineering model,changes of suspender force caused by arch rib lineation defect, hanger lineation defect and boom failure are calculated and analyzed respectively. Calculation results show that, suspender forces are more sensitive to arch＇s vertical defect than to its transverse defect. While, short hangers are more sensitive to lineation defect than long ones,and secondary moment and shear force in short ones are bigger than in long ones. The results also tells that single boom failure can fiercely change neighbor booms＇ forces, at the same time, boom failure spreads faster in short boom area than in long boom area. Traffic increase accelerates structure＇s fatigue fracture.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第6期25-32,共8页
Journal of Chongqing University
基金
铁道部科技研究开发计划-重大课题资助项目(2008G032-10)
关键词
桥梁工程
吊杆拱桥
受力特性
初始缺陷
线形缺陷
吊杆失效
bridge engineering
tied-arch bridge
mechanical characteristics
initial defect
lineation defect
boom failure
