大跨度刚架拱桥裂缝病害机理研究

Study on Crack Disease Mechanism of Long-span Rigid-frame Arch Bridge

刚架拱桥主要建成于20世纪八九十年代,具有受力合理、施工方便、节省材料和简洁美观的特点。进入本世纪后,该类桥型在重载交通下开始出现较严重的病害,需要经常性的维修加固来维持使用性能,甚至于历经多次加固后,结构病害发展仍然得不到控制,需通过限高限载措施维持运营或者不得不拆除重建。以某80 m跨刚架拱为工程实例,通过检测结果对其进行病害分析及结构建模计算来研究其裂缝病害发生机理。

Rigid-frame arch bridge was mainly built in the 1980 s and 1990 s.It has the characteristics of reasonable stress,convenient construction,material saving,simplicity and beauty.After entering this century,this kind of bridge began to appear more serious diseases under heavy traffic,and it needs regular maintenance and reinforcement to keep its service performance.Even after repeated reinforcement,the development of structural diseases cannot still be controlled,so it needs to maintain the operation through height and load limiting measures or have to be demolished and rebuilt.Taking an 80 m-span rigid-frame arch as an engineering example,its mechanism of crack disease is studied through the disease analysis and structural modeling calculation of the detection results.