悬吊桥面系拱桥加固改造安全性分析

张运清，吴军鹏，赵庆云，刘康

山东省交通规划设计院集团有限公司，山东 济南  250101

摘要：为改善以横梁受力为主的悬吊桥面系拱桥受力状态，采用更换吊杆及增设钢管桁架纵梁加固改造方案，以一座系杆拱桥为研究对象，在恒载、活载、温度荷载组合下分析加固改造后的拱桥结构动力性能。结果表明：吊杆断裂后对同侧相邻吊杆内力影响较大，安全系数满足《钢管混凝土拱桥技术规范：GB 50923—2013》要求，与断裂吊杆距离越远，对其余吊杆内力影响越小，对断裂吊杆异侧吊杆内力影响较小；吊杆断裂对系梁位移影响明显；对吊杆断裂后钢管桁架的关键部位进行受力验算，安全性结果满足《钢结构设计标准：GB 50017—2017》要求，该加固改造方案确保吊杆断裂后剩余结构的安全性。

关键词：桥梁工程；拱桥；悬吊桥面系；加固改造；有限元分析；吊杆断裂

Safety analysis of reinforcement and renovation of suspension bridge floor system arch bridge

ZHANG Yunqing, WU Junpeng, ZHAO Qingyun, LIU Kang

Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan 250101, China

Abstract: To improve the stress state of the suspension bridge floor system, which mainly experiences forces on the crossbeam, a reinforcement modification plan has been proposed that involves replacing the hangers and adding steel pipe truss longitudinal beams. Taking a tied arch bridge as the background, the dynamic performance of the reinforced arch bridge structure is analyzed under the combination of permanent load, live load, and temperature load. The results indicate that the failure of a hanger has a significant impact on the internal forces of adjacent hangers on the same side, meeting the requirement of Technical Code for Concrete-filled Steel Tube Arch Bridges:GB 50923—2013 for a safety factor of three; the farther the distance from the broken hanger, the lesser the impact on the internal forces of the remaining hangers, while the effect on hangers on the opposite side of the broken hanger is relatively small; the failure of a hanger noticeably affects the displacement of the tie beam; the key parts of the steel pipe truss after the hanger failure are subjected to force verification, and the results meet the requirements of the Standard for Design of Steel Structures: GB 50017—2017. This reinforcement modification plan ensures the safety of the remaining structure after a hanger failure.

Keywords: bridge engineering; arch bridge; suspension bridge floor system; reinforcement and renovation; finite element analysis; hanger rod fracture