(上海大学土木工程系，上海 200444)

［摘要］在考虑建筑结构自身竖向刚度的基础上，建立并求解钢弹簧浮置楼板双质点动力学模型，给出了地铁振动竖向加速度传递率曲线。设计钢弹簧浮置楼板结构，对隔振前后地铁振动引起的建筑结构竖向加速度时程响应进行现场实测，对比分析了傅里叶值谱以及1/3倍频程。利用MATLAB进行编程计算,并与实测结果进行对比分析，最后建立多层框架结构有限元模型进行计算分析。结果表明：钢弹簧浮置楼板对地铁振动竖向加速度隔振率可达到85%以上，并且在40～100Hz频率范围内，可将原结构竖向振级减小20～30dB。地铁引起的结构竖向振级随着楼层增高有所放大。

［关键词］地铁竖向振动； 钢弹簧浮置楼板； 振动响应； 竖向隔振

中图分类号：TU318， TP391-7文献标识码：A文章编号：1002-848X(2020)03-0072-05

Measurement and analysis of vibration isolation effect of building floor near subway

Ye Pengfei，  Liu Wenguang， Tian Kun

(Department of Civil Engineering, Shanghai University, Shanghai 200444, China)

Abstract:On the basis of considering the vertical stiffness of the building structure itself, the dynamic model of double mass points of steel spring floating floor was established and solved, and the vertical acceleration transfer rate curve of subway vibration was given. The steel spring floating floor structure was designed. The time-history responses of the vertical acceleration of the building structure caused by the subway vibration before and after the vibration isolation were measured in the field. The Fourier value spectrum and 1/3 octave frequency range were compared and analyzed. MATLAB was used for programming calculation, and compared with the test results. Finally, the finite element model of multi-layer frame structure was established for calculation and analysis. The results show that the vibration isolation rate of steel spring floating floor to the vertical acceleration of subway vibration can reach more than 85%, and the vertical vibration level of the original structure can be reduced by 20～30dB in the frequency range of 40～100Hz. The vertical vibration level caused by subway increases with the elevation increase of the floors.

Keywords:subway vertical vibration; steel spring floating floor; vibration response; vertical vibration isolation

*国家自然科学基金（51478257，51308311），上海市自然科学基金（15ZR1416200）。

作者简介：叶鹏飞，硕士，Email:564861049@qq.com。