交通荷载作用下钢弹簧浮置板隔振道路设计参数研究  

Design parameters study of vibration isolation road of steel spring floating slab under traffic load

作　　者：邹锦华[1] 李碧坤 陈伟[2] 陈海斌[2] 黄龙田[2] 邹超 Zou Jinhua;Li Bikun;Chen Wei;Chen Haibin;Huang Longtian;Zou Chao(School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,P.R.China;Architectural Design and Research Institute of Guangdong Province,Guangzhou 510010,P.R.China)

机构地区：[1]广东工业大学土木与交通工程学院,广州510006 [2]广东省建筑设计研究院,广州510010

出　　处：《土木与环境工程学报（中英文）》2020年第4期124-134,共11页Journal of Civil and Environmental Engineering

基　　金：广东省科技计划(2015B090901054);广东省交通运输厅科技项目(科技-2017-02-013)。

摘　　要：为降低城区道路汽车荷载对建筑结构的振动影响,设计一种新型钢弹簧浮置板隔振道路,对浮置板的动力学设计参数进行研究。在浮置板缩尺模型有限元试验验证的基础上,选取浮置板长度、厚度、弹簧刚度、弹簧支承间距4个参数及不同水平值,进行正交试验,建立81个样本的三维有限元模型。采用模态分析法,研究各参数对浮置板固有频率和振型的影响;实测交通荷载激励,分析激励作用下浮置板结构在时域和频域的响应,并通过Z振级和插入损失探讨浮置板结构各参数的减振效果。结果表明:各样本基频主要分布在4~10 Hz之间,基频直接影响钢弹簧浮置板的隔振性能;随着浮置板长度的减小、厚度的增大、弹簧刚度的减小、支承间距的增大,浮置板结构的隔振效果明显提高;交通荷载激励下,浮置板结构振动放大频段位于基频附近及14~18 Hz范围;VL z振级在0~18 Hz范围内随频率增大而增大,之后随频率增大而降低,但未超过72 dB;对于0~40 Hz范围内的振动响应,样本最大减振量为40.6 dB,基频处放大量最大为17.4 dB。In order to reduce the influence of vehicle loads on the vibration of building structure,a new type of steel spring floating slab vibration isolation road was designed,and the dynamic design parameters of floating slab were studied.On the basis of finite element test verification of the scale model of floating slab,four parameters were selected and orthogonal tested,including length and thickness of floating slab,spring stiffness and support spacing.Total of 81 cases of corresponding 3D finite elements were established.The modal analysis method was used to study the influence of various parameters on the natural frequency and vibration mode of the floating slab.The traffic load excitation was measured,and the response of the floating slab structure in the time domain and the frequency domain was analyzed,and the vibration damping effect of each parameter of floating slab structure is discussed by Z vibration level and insertion loss.The results show that the fundamental frequency of each sample is mainly distributed between 4 Hz and 10 Hz.The fundamental frequency directly affects the vibration isolation performance of the steel spring floating slab.With the decrease of the length,the increase of the thickness,the decrease of the stiffness of the spring and the increase of the spacing of the supports,the isolation effect of the floating slab structure is obviously improved.The vibration amplification frequency band of the floating slab structure is located near the fundamental frequency and in the range of 14~18.0 Hz under the traffic load excitation.The VL z vibration level increases with increasing frequency in the range of 0~18 Hz,and then decreases with increasing frequency,but does not exceed 72 dB.For the vibration response within the range of 0~40 Hz,the maximum amount of vibration reduction in all samples is 40.6 dB,and the maximum amount of emission at the fundamental frequency is 17.4 dB.

关 键 词：交通荷载 钢弹簧浮置板道路 模态分析 振级 插入损失 设计参数 

分 类 号：U416.0[交通运输工程—道路与铁道工程]