Blasting Vibration On The Neighboring Frame-Shear Wall Structure Of The Dynamic Response Analysis

Engineering background of this paper is the blasting excavation engineering of the the line separated tunnel in Dalian from Nanguanling Town station to Nanguanling station. Combined the method of the engineering practice and theory analysis with the engineering practice, this paper reveals the energy propagation and the attenuation law of the tunnel blasting vibration in hard strata. The structural dynamics theory of blasting vibration is described according to the common structural dynamics theory. Base on the input data of the excavation blasting record under the actual condition, establish the theory and calculation method of structure elastic response spectrum analysis and time history analysis of responses of the horizontal ground motions. Finally, through the ANSYS finite element software, calculation and analysis of dynamic response of a12layer frame and build on the Minyuc residential building in shear wall structure under the action of blasting vibration is done. The main research contents and results are as follows:(1) Through the generation mechanism of the blasting vibration, the basic parameters of the blasting seismic wave and the influence factors of blasting intensity, in construction, vibration and noise reduction and blasting vibration monitoring are used. Through the control of a single maximum charge and the decrease of the blasting vibration acceleration, so the building security in a strong close is ensured.(2)By the Matlab, the spectrum of the blasting vibration can be obtained, after that distribution characteristic of blasting seismic wave’s peak of the frequency can be studied. Combined the finite element characteristics with the composition of thehigh-rise frame-shear wall structure, the model of the structure for dynamic analysis can be established. In the model, the elements of the girder and the column are beam elements and the elements of the floor and wall are shell element.(3)Through the modal analysis of the frame-shear wall structure, the natural vibration characteristics of the structure is studied in this paper.(4)Used the method of multi-support excitation, through the reaction spectrum value of the blasting seismic wave under the characteristic period of0.3s,0.4s and0.45s, compare the maximum response of the frame-shear wall structure of the three characteristic period.(5)With the method of the elastic time-history analysis, compare the maximum response of the frame-shear wall structure when the blasting seismic wave’s peak of the frequency is20.9Hz,8.9Hz or12.3Hz.