Blasting Vibration Character And The Study Of Influence On Structure

With the development of our country economy, blasting technique is applied a large number in engineering building, whereas blasting calamity is an import matter in blasting research at all times, especially because of universality, complexity and provoking bother easily, building damage provoked by blasting vibration is concerned much more. With the method of field testing, academic analyse and dynamical finite element calculation, the characteristic of blasting vibration and dynamical response of building in the load of blasting vibration are analyzed.Mechanism of production, sort of blasting seismic wave and parameter of blasting seismic wave are introduced. Based on the field testing data, three—dimensional velocity formula are concluded with regression analysis. With fourier and wavelet packet analysis, frequency character and energy distributing character are analyzed.Based on the structural dynamics, the foundation of equation of motion in single-degree-freedom system and multi-degree-freedom system is studied, and the equation of single-degree-freedom system in forced quake is solved theoretical, shear force in the load of blasting load is counted with equivalent stiffness principle, conceptual model of walling crack is introduced, And the dynamic influence of three blasting vibration parameters on the building is analyzed theoretical.Because the complexity of blasting seismic wave, analytic solution of dynamic response is not gained, with the numerical calculation software, the building response character in three-dimensional blasting seismic wave is analyzed. With the numerical calculation method, the influence of amplitude, frequency and duration on structure is calculated.