斜拉-连续梁协作体系桥梁加固技术  

Reinforcement technology of cable stayed continuous beam cooperative system bridge

作　　者：常丁[1] 袁朝华 CHANG Ding;YUAN Zhaohua(CCCC First Highway Consultants Co.,Ltd.,Xi’an 710075,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710075

出　　处：《四川建筑科学研究》2022年第6期42-47,共6页Sichuan Building Science

基　　金：陕西省科技计划项目(2019GY-211)。

摘　　要：针对斜拉-连续梁协作体系桥梁出现的混凝土开裂、梁体下挠等病害,对主梁安全性加固改造技术进行了研究。在墩顶向两侧布置了体外预应力,粘贴了斜向碳纤维板,并采用超高性能混凝土进行了增大截面加固;对箱内裂缝超限的顶板、墩顶以外的其他位置的横隔板,采用了粘贴碳纤维板补强。结果表明,该加固方案改善了桥梁主梁截面正截面抗弯性能,并进一步提高了抗剪承载力,一定程度上改变了主梁的应力分布,保证了截面应力均小于规范容许应力值,使结构满足了承载和正常使用能力要求。In view of the concrete cracking,beam deflection and other diseases of the cable stayed continuous beam cooperative system bridge,this paper studied the safety reinforcement and transformation technology of the main beam. The external prestressing was arranged on both sides of the pier top,the inclined carbon fiber board was pasted,and the ultra﹣high performance concrete was used to increase the section. For the diaphragm with cracks exceeding the limit at other positions except the roof and pier top in the box,the carbon fiber board was pasted for reinforcement. The results show that the bending resistance of the normal section of the bridge girder section is improved,the shear bearing capacity is further improved,the stress distribution of the girder is changed to a certain extent,the section stress is less than the allowable stress value,the structure meets the requirements of bearing capacity and normal use capacity after reinforcement.

关 键 词：斜拉-连续梁协作体系桥梁 体外预应力 碳纤维板 受力特性 桥梁加固 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]