Dynamic Response Research Of Structures Under Blasting Vibration And Disaster Control

The development of blasting industries tend to accurate controlled blast, how to realize accurate controlled blast is all blasting workers'research direction. The blast site near residential areas usually disputes because of blasting vibration, or even goes to the court. This article will focus on building structures'dynamic response and disaster control under the action of blasting vibration.The thesis firstly studies the mechanism of blasting vibration and impact factors of blasting vibration, including g peak particle velocity, the frequency spectrum characteristics of blasting vibration, the duration characteristics of blasting vibration, structures's blasting seismic effect, the distance between buildings and explosion points, soil conditions and terrain. Then the thesis studies the dynamic calculation methods of the structure's blasting vibration response and does a theoretical study of the bottom shear method, the response spectrum method and the time histroy analysis method.The thesis studies on-site blasting vibration test methods, including blasting vibration testing purposes, content, methods, instrumentation, principles of measurement points'layout, test result analysis.The author use the finite element software LS-DYNA and combines with engineering examples to simulate the dynamic response of frame structure under the action of blasting vibration. For frame structure, through the displacement analysis and velocity analysis the author verifies the vertical blasting vibration plays control effect in three directions.The blasting vibration response of the structure is directional, for example under vertical blasting vibration vertical vibration response of the structure is controlled. The polarization phenomenon is also validated. Through numerical simulation and the data processing the blasting vibration amplification coefficient of high-level framework is obtained, comparing all structural layers's maximum displacement, maximum velocity and blasting vibration amplification factor, the author find that in all the floors the top floor's displacement and velocity is largest, blasting vibration amplification coefficient is maximum too which indicating that the top floor has the strongest blasting vibration response. This paper studies the blasting vibration control measures mainly from the control of blasting source, the transmission way and other control methods.