Study On The Dynamical Response Of Continuous Bridge And Safety Assessment By The Blasting Seismic Wave

The research of the effects of blasting quake is mainly the research on the characteristics of the spread of blasting seismic wave and the structural dynamical response which is near by the explosion source under the blasting vibration. Bridge is an important infrastructure in traffic transportation, so it is great necessary to study on the dynamical response of continuous bridge, which is a common bridge structure form, under the blasting quake.Firstly, this paper abbreviate the elementary knowledge about the blasting seismic wave and its formation, kinds, basic characteristic, the regularity of the spread, and the factors of influence; introduce the computational methods about the artificial simulation of blasting seismic wave based on the theory about the motivation of blasting vibration, and analysis the dynamical response of the multi-degree of freedom system under the blasting vibration by the response spectral theory; provide a theoretical basis to study the dynamical response of continuous bridge under blasting seismic waves.Secondly, based on the self-oscillation characteristic analysis of continuous bridge, study the difference about response of displacement and internal force under a same response spectrum design of antiknock seismic by the response spectrum method and square root sum of square method that is used to calculate mode superposition, analysis the dynamical response of continuous bridge under the near-field design response spectrums of antiknock seismic and the middle-far-field one, obtain some beneficial conclusions.Finally, combine with the blasting quake influencing factors and security criterion, the safety assessment method of continuous bridge that under the blasting quake, as well as the ways and means of how to control the disaster of blasting quake are proposed. The conclusions of this paper provide significant guide to the continuous bridge's design of antiknock and the safety assessment method under the blasting quake, and present reference for engineering practice and theoretical research in future.