摘要
为评价多梁式拼宽桥的整体性,依托运营状态下的动力响应监测数据,建立了一种基于响应频谱相似度的横向协同工作性能定量评价指标。以广东省一座1996年建成、2012年加固拓宽的中小跨径梁桥为研究对象,首先在每片主梁跨中底部安装竖向加速度传感器;然后基于监测响应大数据的特点,通过叠加平均算法获得高质量的响应频谱;最后利用加速度频谱计算构建指标,对桥梁整体性进行了全面评价。分析结果表明:每片主梁的加速度频谱变化规律高度一致,特征频率基本相同,相邻主梁之间的频谱相似度均超过0.90,各梁间的横向协同工作性能良好;新旧桥的第一奇异值谱高度相似,奇异值谱相似度为0.91,新旧桥拼宽服役至今仍能较好地协同受力。以上指标结果表明,多梁式拼宽桥的整体性良好,这与多类型准静态时域响应推断出的结果一致,验证了文章所建立评价指标的可行性和科学性。
To evaluate the integrity of multi-girder widened bridges,a quantitative evaluation method based on response spectrum similarity for transverse cooperative working performance was established.The study focused on a short-and medium-span girder bridge in Guangdong province,constructed in 1996 and widened in 2012.Vertical acceleration sensors were installed at the mid-span bottom of each girder.Leveraging the characteristics of structural health monitoring data,a high-quality dynamic response spectrum was obtained through the ensemble averaging algorithm.The evaluation index was then constructed using the calculated acceleration spectrum to comprehensively assess the bridge s integrity.The analysis results indicated that the acceleration spectrum patterns of each girder were highly consistent,with similar characteristic frequencies.The spectral similarity between adjacent girders exceeded 0.90,reflecting good transverse cooperative working performance.The first singular value spectra of the new and old bridges were highly similar,with a singular value spectrum similarity of 0.91,demonstrating that the widened bridge continues to exhibit cooperative performance effectively.These findings confirm the integrity of the multi-girder widened bridge,consistent with conclusions drawn from various quasi-static time-domain responses,thereby validating the feasibility and scientific basis of the proposed evaluation method.
作者
孙治海
张俊平
魏斌
黄河淏
张泰权
SUN Zhi-hai;ZHANG Jun-ping;WEI Bin;HUANG He-hao;ZHANG Tai-quan(Earthquake Engineering Research&Test Center,Guangzhou University,Guangzhou 510006,China;Oil-Petrochemical Project Quality Supervision Station,Beijing 100101,China;Guangdong Jiaoke Testing Co.,Ltd.,Guangzhou510550,China)
出处
《广州大学学报(自然科学版)》
2025年第3期52-60,共9页
Journal of Guangzhou University(Natural Science Edition)
基金
国家自然科学基金资助项目(52178280)。
关键词
中小跨径梁桥
改扩建公路
协同工作性能
动力响应频谱
short-and medium-span girder bridge
widened highway
cooperative working performance
dynamic response spectrum
