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基于导波传递分析的板肋钢桥面板振动特性研究

Research on vibration characteristics of plate-rib steel bridge deck based on guided wave transmission
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摘要 从弯曲波导波传递特性角度出发,结合振动试验和数值仿真开展钢桥板肋桥面板的动力特性和振动机理研究。首先开展板肋钢桥面板室内振动试验;继而运用模态叠加有限元法建立经试验验证的三维有限元动力模型,进行板件振动能量计算,并基于有限元模式分析法建立导波模型,对结构面外弯曲波频散特性和导波类型展开研究;最后对比顶板厚度、肋板厚度以及肋板间距三种设计参数对板件振动能量和弯曲波导波特性的影响。结果表明:经试验测试单边悬挂约束下顶板和肋板振动响应的优势频段出现在300Hz和400Hz,且肋板边缘测点的振动能量更大;边界固结约束下较薄的顶板具有较高振动能量峰值和较低的峰值频率;从导波传递角度来看,板肋桥面板弯曲波频散曲线均出现了通频带与衰减带间隔出现的现象,导波模态数随顶板和肋板厚度的增长而减小,顶板厚度对板件面外振动衰减带影响最大,其中带宽最大差值达110Hz,因此可通过顶板厚度对结构的面外弯曲波振动衰减带进行有效控制。 From the perspective of bending guided-wave,by combining vibration experiments with numerical simulations,the dynamic characteristics and vibration mechanism of steel-slab-ribbed bridge-deck are studied.Firstly,the vibration laboratory test of the steel-slab-ribbed bridge-deck is performed.Secondly,a test-verified three-dimensional dynamic model is established based on the modal superposition finite element method,so that the plate vibration energy can be calculated.Furthermore,based on the finite element mode analysis method,the guided-wave types and dispersion characteristics are studied with a guided-wave model.Finally,the influences of plate thickness,rib thickness and rib space on vibration energy and characteristics of bending guided-wave are studied.The research results discloses that under unilateral suspension constraints,the dominant frequency bands of plate and rib vibration responses appear at 300 Hz and 400 Hz,and the vibration energy at the measuring points of rib edge is greater.Under the boundary consolidation constraint,the thinner plate has higher vibration energy peak value and lower peak frequency.From the perspective of guided wave transmission,the pass-band and attenuation band may appear with interval on the frequency dispersion curves of bending waves,the guided-wave mode number decreases with the increase of plate and rib thickness.Plate thickness has the greatest influence on the out-of-plane vibration attenuation zone,and the maximum difference in bandwidth is 110 Hz.Therefore,the out-of-plane wave vibration attenuation zone can be effectively controlled through plate thickness.
作者 李小珍 孙雅黛 郑净 梁林 Li Xiaozhen;Sun Yadai;Zheng Jing;Liang Lin(Southwest Jiaotong University,Chengdu 610031,China;West Anhui University,Liuan 237012,China)
出处 《土木工程学报》 EI CSCD 北大核心 2022年第4期55-67,75,共14页 China Civil Engineering Journal
基金 国家自然科学基金(51878565)。
关键词 面外弯曲波 频散特性 有限元分析 板肋钢桥面板 振动试验 out-of-plane bending wave frequency dispersion characteristics finite element analysis slab-rib bridge decks vibration experiment
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