The Influence Of Subway Vibration On The Seven-story Frame Office Building And The Vibration Isolation Method

In recent years,the subway has developed rapidly.There is an increasing density of housing around the subway line.The environmental problems caused by vibration induced by subway operation are becoming more and more obvious.It is very necessary to study the response of buildings around the subway line to vibration and to analyze the effect of vibration reduction and isolation methods.The research object of this paper is an eightstory office building with frame structure.This paper mainly studies the vibration load simulation caused by subway running,the vibration attenuation characteristics,the vibration isolation effect of hollow ditch and underground diaphragm wall.Mainly content of this article is as follows:1.After determining the soil size,free field boundary and finite element element size,MIDAS GTS NX finite element analysis software is used to establish a three-dimensional finite element model of tunnel-soil-building structure for modal analysis and obtain the characteristic period of the first ten modes.2.The mobile wheel load and the excitation function method respectively to simulate the subway operation caused by vibration load,the analysis on two kinds of load under the action of the same node respectively after the characteristics of the acceleration response in time domain and frequency domain,moving wheel load simulation of the load and the actual vibration has a certain gap,and the excitation function method to simulate the load and the actual vibration more nicely.3.The study of subway operation caused by vibration propagation and attenuation regularity in the structure of the soil and construction and key nodes in time domain and frequency domain analysis of vibration response,across different soil layer,due to the effect of scattering of the P wave and S wave increase the R wave can lead to vibration response between different soil layer increases,the vibration by soil to building will decay quickly,vibration attenuation in horizontal direction is fast in the vertical direction.4.Combining Rayleigh wavelength,the use of air gap and the underground continuous wall vibration isolation study in two ways,in the time domain and frequency domain research the effect of two methods of vibration isolation,vibration isolation for building empty groove weaken the effect of vertical vibration at about 20%,and the construction level to the vibration of the weakening effect at about 10%,vertical to the vibration isolation effect is stronger than the level and the low frequency vibration of the blocking effect is stronger than the high frequency vibration;However,the attenuation effect of the underground continuous wall on the horizontal and vertical vibration of the building is about 3%,but the suppression effect on the vibration amplification range of the building is obviously stronger than that of the isolation ditch,and the blocking effect on the low-frequency and mediumhigh frequency vibration is stronger than that of the medium-frequency vibration.