The Elasto-plastic Seismic Response Analysis Of Long Span Continuous Rigid Frame Bridge

Along with the national economy's development, the long span bridge is developing quickly in our country, and the long span continuous rigid frame bridge is one of the most widely application bridge types, there were lots of this bridge built and builting in our country. At the same time, our country is muti-seismal, therefore, the bridge construct as the lifeline project, especially the long span bridge construct, it is necessary and essential to make a detailed and deeply analyze the reaction of earthquake effect.There are several tasks in this text like below shown:(1) Firstly, it analyzes the aseismetic design's status and deficiency of the long span continuous rigid frame bridge at present, points out that seismic response analysis is essential; Second, it analyzes the Beijiang bridge's dynamic characteristic, then basis on earthquake intensity of the Beijiang location area and the similarities and differences of each country's criterion to the input of vertical earthquake, it does the spectrum response analysis and elastic time-history analysis respectively, comes out the conclusion that earthquake input direction has an effect on the continuous rigid frame bridge's calculation result.(2) In each country's aseismatic design criterion, it needs to consider the construction's safety and economy when designing. Besides it does the construction's plastic time-history analysis under the effect of "small earthquake", it still needs to do the elastic-plastic time-history analysis under the effect of "big earthquake". Therefore, in this text, it bases on the Rigidity degeneration trilinear model to simulate the bridge pier and underside peg, inputs earthquake wave, comes out the calculation result, then it estimates the weak section of the continuous rigid frame bridge and the bend order, which provides reference to the engineering design.(3) Firstly, it introduces the application status and basic theory of the pushover analysis method, then evaluates the aseismatic capability of Beijiang bridge, At last it analyzes the difference among the existing load patterns and non-linearity analysis, these results provide proof for reference of engineering anti seismic design.