基于影响线法的中小型桥梁状态快速评定——以厦门市某桥梁为例  

Rapid state assessment of small and medium-sized Bridges based on influence line method--A case study of a bridge in Xiamen City

作　　者：林翼锋 LIN Yifeng

机构地区：[1]健研检测集团有限公司,福建厦门361004

出　　处：《福建建设科技》2023年第5期95-98,共4页Fujian Construction Science & Technology

摘　　要：我国目前新建和在役的中小跨径桥梁数量超过100万座,定期评估桥梁状态,确保如此庞大规模的桥梁安全运营,具有重要的社会意义。目前,桥梁状态评估大多需要开展耗时且可操作性不高的静载试验和动载试验。为了实现桥梁状态的快速评定,本文提出了一种基于影响线法的状态评定方法。该方法首先从车致桥梁响应信号中识别桥梁的影响线,然后基于影响线的识别结果进行虚拟加载,最后通过计算虚拟加载值和桥梁模型计算值得到的校验系数,快速评定桥梁状态。以厦门市某三跨预应力混凝土连续箱梁桥的现场试验为例,验证了本方法的可靠性和有效性。同时,现场试验结果也表明,相较于传统的基于静载试验和动载试验的桥梁状态评定方法,本方法具有操作性高和耗时短的显著优势。Currently,there are over one million small and medium-span bridges in operation and under construction in our country.Therefore,regular assessment of bridge state is of significant social importance to ensure the safe operation of such a large number of bridges.Currently,bridge state assessment often involves time-consuming and less practical methods such as static and dynamic load tests.To achieve rapid assessment of bridge state,this study proposes a method based on influence line analysis.The method first identifies the bridge influence line from the response signal induced by vehicle loads.It then conducts virtual loading based on the identified influence line,and finally evaluates the bridge state rapidly by calculating the verification coefficient derived from the virtual loading values and the bridge model calculations.The proposed method s reliability and effectiveness are validated through on-site tests conducted on a three-span prestressed concrete continuous box girder bridge in Xiamen City.The results of the on-site tests also demonstrate that the proposed method has significant advantages in terms of high operability and time efficiency compared to traditional methods relying on static and dynamic load tests.

关 键 词：影响线 桥梁状态评定 虚拟加载 现场试验 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]