The Influence Of Intensity Measures On The Seismic Response Of The Continuous Beam Bridge

In the21century, our country has made rapid development of the bridge, and in enormousquantity of small and medium-sized span and wide general long-span Bridges, various forms ofprestressed concrete bridge has been dominant, and has a broad development prospects. At thesame time, global earthquake frequency gradually rise, brought about by the damage has stepby step. With the emergence of the performance-based earthquake engineering(PBEE) and thetheory of seismic design (PBSD) and continuous development, structure of seismology hascontacted to seismic. the first important stage of Performance-Based earthquake engineeringand seismic design theory is the seismic risk analysis, and the choice is reasonably vibrationcharacteristics of ground motion, accord with the actual earthquake disaster environment,making the calculation results such as probabilistic seismic demand more real and credible, andas important basis for the structure design, analysis and reinforcement. Based on thisbackground, this paper Starting from the bridge structure characteristics, System research theground motion characteristics of the seismic response of influence, put forward someSuggestions to choose reasonable Intensity Measures(IM). The proposal will make thecalculation results more in line with the actual earthquake disaster environment, and alsosignificantly improve the accuracy of the calculation efficiency of the probability seismicdemand model, engineering demand parameters (EDP) risk curve, and so on. Taken together,this paper mainly do the following a few parts work:(1) Through a lot of material experiment and Push-over test, according to the actualdrawings, research how to choose reasonable material constitutive relation, structure unit and soon, in view of the different characteristics of bridge structure, building a more reasonable finiteelement model, more real and accurate simulation in the bridge structure under the action ofvarious elastic and nonlinear behavior.(2) Study the influence of Intensity Measures for bridge structures seismic response, thispaper reveals the dynamic characteristics of the beam bridge with different structure fordifferent ground motion of the sensitivity of the strength parameters.(3) According to the dynamic characteristics of the beam bridge the particularity andcomplexity as the high state effect, analyzes the impact on ground motion characteristics andstructural dynamic characteristics for bridge structures earthquake demand, determine theIntensity Measures for different components, different seismic response the influence degree ofthe parameters.(4) In the aseismic design of bridge reasonable selection of Intensity Measures, put forward some Suggestions on quantitative ground motion strength level.