Study On Dynamic Response And Damage Of Structures To Blasting Vibration Waves

At the meantime of widespread application of the blasting technology, a series of negative effects induced by engineering blasting especially blasting vibration effect which is regarded as head of blasting hazards has been commonly focused with the increasing of complication of blasting surroundings and people's consciousness for environmental protection. To study the damaging mechanism of blasting vibration effect especially to study the mechanism of dynamic response of surrounding buildings induced by blasting vibration waves is the key and difficult subject in research field for blasting vibration effect, which is also the important content for blasting safety technique.Based on these instances, combining National Natural Science Foundation of China named "Study on Damage and Breakage of Structure to Blasting Vibration" (No:50878123), on the basic of consulting and lucubrating on a great many domestic and overseas references related and with analytical methods such as numerical analysis, signal analytical technology, dynamic finite element theory and etc., dynamic damage constitutive model of structure material, structure respond to non-uniform blasting vibration, damage of structure to blasting vibration and the influence of three main characters of blasting vibration wave to structure's dynamic respond was analyzed. The main research findings are as follows:(1) The semi-implicit return mapping algorithm was chosen to explose LS-DYNA user defined material model, t calculate constitutive equations, and the triaxial compression experiment of one-element model is used to verify exactness of the programme.(2) Strain rate computation formulae of one point were given under simple stress wave, and the way was put forward that how to calculate strain rate using blasting vibration experimental data.(3) Non-uniform excitation loading of field-measured data was achieved using Lagrange interpolation, then different responses of common masonry structure under different excitation ways (uniform excitation, multi-support excitation, non-uniform excitation) were simulated and analyzed.(4) The orthotropic dynamic damage model of was found and proved by experiment of lectures.(5) Based on the dynamic damage model of structure materials, damage and dynamic responds of typical masonry structure to blasting vibration wave were calculated by LS-DYNA. The influence of damage, strain-rate effect and the three main characters of blasting vibration wave to structure's dynamic respond was analyzed.