Study On Blasting Seismic Response And Safety Evaluation Of Long Span Suspension Bridge

With the blasting technology widely used in project fields, blasting vibration effect and safety assessment of structures become one important research topic in engineering field. Bridge structure is an important infrastructure facilities, while the most common suspension bridge as a structure to study its dynamic response under blasting vibration is necessary.First, the formation of blasting seismic waves, the basic characteristics of propagation of the basic theories were expounded in the paper, and the forecast of blasting vibration, signal processing and control methods is described. Using kinetic theory derived the principle of response spectra, and applying the response spectrum and time history analysis analyzed the dynamic response of multi-degree of freedom system under blasting vibration, which provides the theoretical basis for the study of suspension of blasting seismic wave dynamic response.Second,models were calculated on the bridge vibration characteristics analysis. Response spectrum and time history analysis method were carried out on the suspension bridge dynamic response analysis, whose results show time history analysis results on the burst response spectrum to complement checking is needed.Response spectrum of inputting on the direction of blasting and space combinations were studied, using multi-dimensional portfolio space response spectrum for blast resistant design more secure.Blasting for the same response spectrum curve,with the increase of acceleration response spectra, structural response of internal force also increased.Calculated the dynamic response of structures under the explosion source near and far zone two response spectrum,which responses the use of response spectra for near than the far blast-resistant design response spectrum of blast resistant design is more secure.Finally, based on Dynamic Response,the general method of blasting safety assessment is introuced.a more reasonable bridge seismic safety assessment of antiknock power is proposed. The conclusion of this text will have the certain instruction significance to antiknock design and defense research, which will also provide references for latter engineering practice and theory research.