莘庄枢纽上盖建筑振动影响仿真分析

Vibration Effect Simulation Analysis of Superstructure in Xinzhuang Hub Project

摘要:

为研究沪杭客专列车运行时所引起的振动对莘庄综合枢纽工程中邻近线路建筑物的影响,建立了莘庄枢纽车站半空间一体化有限元模型.采用列车荷载分析模型，根据莘庄站现场实测钢轨振动加速度，采用数定表达式，计算得到轮轨荷载，仿真分析沪杭客专运行时，在碎石道床以及增设隔振基础工况下，邻近建筑振动响应.结果表明：沪杭客专列车运行，在碎石道床工况下，对邻近10 m的酒店式公寓建筑振动影响较大，最大振级为79.68 dB；对相对距离97 m的住宅影响较小，最大振级59.1 dB.增设隔振基础结构之后，酒店式公寓最大振级为62.96 dB，降低16 dB左右，隔振效果明显，可以有效降低沪杭客专运行时引起的各楼层的振动，同时满足国家及地方的相关规范要求.

Abstract:

In order to study the vibration effect generated by rail vehicles transiting on the adjacent buildings of Hu Hang railway passenger dedicated line in Xinzhuang Station pivotal project, Xinzhuang Station half space integration finite element model was established. According to loading analysis model for the train vibration and mathematical expression, wheel rail force was calculated through field test rail acceleration data of Hu Hang railway passenger dedicated line. Simulating and analysis vibration level of Hu Hang railway passenger dedicated line adjacent buildings, under ballast track and with additional isolation base working condition. The result shows that in the case of ballast track, vibration influence on T17 adjacent serviced apartment, at a distance of 10m from track, generated during Hu Hang railway passenger dedicated line operation is significant, and the VLzmaxis 79.68 dB; vibration influence on T17 adjacent residential building, at a distance of 97 m from track, is small, and the VLzmaxis 59.1 dB. Under the condition of addition isolation base structure, the VLzmax of T17 adjacent serviced apartment is 62.96 dB, reducing 16 dB relating to ballast track condition, and the vibration isolation effect is significant. By applying additional isolation base structures, the VLzmax values of different floors in the two building decreased effectively, national and local standards were satisfied.