服役15年大跨跨海预应力混凝土梁桥荷载试验及结构性能评价  

Load Testing and Structural Performance Evaluation of Large-Span Pre-Stressed Concrete Beam Bridge in Service for 15 Years

作　　者：陆俊宏 黎家玮 李金涛 吴宜峰 LU Junhong;LI Jiawei;LI Jintao;WU Yifeng(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044;Beijing JiuTongqu Testing Technology Co.,Ltd.Beijing 100071)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京九通衢检测技术股份有限公司,北京100071

出　　处：《北京建筑大学学报》2024年第1期100-108,共9页Journal of Beijing University of Civil Engineering and Architecture

基　　金：北京市自然科学基金项目(8194057);北京建筑大学研究生创新项目(PG2023041)。

摘　　要：大跨预应力混凝土梁桥因其结构刚度大、行车平顺舒适、抗震性能好、施工技术成熟等优势得到广泛应用,该类桥梁在服役较长时间后,由于自然环境和超载的长期影响可能导致结构出现裂缝,并影响结构的安全承载能力,这一问题对于跨海桥梁显得尤为突出。因此,为准确评估在役跨海混凝土桥梁的实际工作状态与承载能力,通过对一座已服役15年的大跨跨海预应力混凝土梁桥进行现场静载、动载试验,并结合有限元对其振型等特性进行了分析。研究结果表明,桥梁结构的工作性能仍保持良好,但由于所处海域环境及长期服役导致的结构损伤和裂缝的影响,使其实际承载能力有所下降。研究成果可为在役同类桥梁的维修加固提供参考。The large-span prestressed concrete beam bridge has been widely used due to its advantages of high structural stiffness,smooth and comfortable traffic,good seismic performance,and mature construction technology.However,after a long period of service,such bridges may develop cracks in their structure due to the long-term effects of natural environment and overloading,which can affect their safe carrying capacity.This problem is particularly prominent for long-span bridges over the sea.Therefore,in order to accurately assess the actual working condition and carrying capacity of an in-service long-span prestressed concrete beam bridge over the sea,on-site static and dynamic load tests on a bridge that has been in service for 15 years are conducted.The characteristics such as vibration mode were analyzed using finite element analysis.The research results indicate that the structural performance of the bridge remains good,but the actual carrying capacity has decreased due to structural damage and crack formation caused by the environmental conditions in the marine area and long-term service.The findings of this study can provide reference for the maintenance and strengthening of similar in-service bridges.

关 键 词：大跨预应力混凝土梁桥 有限元建模分析 静载试验 动载试验 结构性能评价 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]