非结构构件对城市高架桥动力特性的影响研究
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摘要
由于桥梁结构动力分析一般忽略护栏、声屏障等附属设施对主体结构质量和刚度分布的贡献,为了构建精细化桥梁有限元模型来准确计算运营期的桥梁振动,开展了非结构构件对城市高架桥动力特性的影响研究。利用ANSYS软件建立了城市高架桥主体结构的有限元模型,基于模态分析获得了桥梁结构频率、振型方面的动力特性。同时,分别设置了护栏和声屏障以及两者共同作用的桥梁结构有限元模型,并对比分析了各自的模态特征,确定了不同非结构构件对频率、振型方面的变化规律。表明非结构构件会导致桥梁结构的局部振型增多,纵向、横向自振频率减小,竖向自振频率增大,结果更接近于实际状态。因此,在实际工程中需要考虑非结构构件的参振影响,对构建精细化桥梁有限元模型和动力分析具有重要的指导意义。
The contribution of guardrails, sound barriers and other ancillary facilities to the mass and stiffness distribution of the main structure is generally ignored in the dynamic analysis of bridge structure. In order to establish a refined finite element model of the bridge to calculate the vibration of the bridge in operation period, the influence of non-structural components on the dynamic characteristics of urban viaduct was investigated. The finite element model of the main structure of urban viaduct was established by using ANSYS software. Based on modal analysis, the dynamic characteristics of bridge structure in frequency and mode were obtained. At the same time, guardrail and sound barrier as well as both of them of the finite element model of bridge structure were respectively set up and their modal characteristics were compared and analyzed. The variation rules of frequency and mode of vibration of different non-structural components were determined. It is shown that non-structural components will lead to the increase of local vibration modes, the decrease of the longitudinal and transverse frequencies and the increase of the vertical frequencies of bridge structures. The results are closer to the actual state. Therefore, it is necessary to consider the influence of parametric vibration of non-structural members in practical engineering, which has important guiding significance for the construction of refined finite element model and dynamic analysis of bridge structure.
The contribution of guardrails, sound barriers and other ancillary facilities to the mass and stiffness distribution of the main structure is generally ignored in the dynamic analysis of bridge structure. In order to establish a refined finite element model of the bridge to calculate the vibration of the bridge in operation period, the influence of non-structural components on the dynamic characteristics of urban viaduct was investigated. The finite element model of the main structure of urban viaduct was established by using ANSYS software. Based on modal analysis, the dynamic characteristics of bridge structure in frequency and mode were obtained. At the same time, guardrail and sound barrier as well as both of them of the finite element model of bridge structure were respectively set up and their modal characteristics were compared and analyzed. The variation rules of frequency and mode of vibration of different non-structural components were determined. It is shown that non-structural components will lead to the increase of local vibration modes, the decrease of the longitudinal and transverse frequencies and the increase of the vertical frequencies of bridge structures. The results are closer to the actual state. Therefore, it is necessary to consider the influence of parametric vibration of non-structural members in practical engineering, which has important guiding significance for the construction of refined finite element model and dynamic analysis of bridge structure.
引文
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[2]HUA GANG LV,XUE YING LV,YONG GANG SHEN,et al.Dynamic characteristics of hybrid girder cablestayed bridge[J].Advanced Materials Research,2014,968:254-258.
[3]李子春.桥墩形式对连续刚构桥动力特性的影响[J].中国公路学报,2011,24(2):70-76.
[4]王浩,程怀宇,陶天友,等.结构关键参数对三塔悬索桥动力特性的影响[J].振动·测试与诊断,2014,34(2):261-267,396.
[5]MAREK PA?TAK,BOGUS?AW JAREK.Parametric analyses of dynamic characteristic of the cable-stayed pedestrian bridge[J].Civil and Environmental Engineering Reports,2017,27(4):77-90.
[6]曾少辉,雷晓燕,罗锟,等.基于预实验分析的箱梁模型模态测试[J].噪声与振动控制,2018,38(1):21-25.
[7]谢伟平,曹晓宇,肖伯强,等.基于模态测试的宽幅钢箱梁桥有限元模型建立?修正与分析[J].振动与冲击,2018,37(1):98-105.
[8]何卫,谢伟平.基于舒适度评价的大跨度车站结构精细化模型研究[J].土木工程学报,2014,47(1):13-23.
[9]任翔,谭潇,宋飞,等.预应力混凝土连续梁桥动力特性及影响因素分析[J].重庆交通大学学报(自然科学版),2018,37(10):8-12.
[10]王浩,乔建东.桥梁结构动力特性的有限元分析与试验研究[J].公路交通科技,2004(6):78-80.