Continuous Rigid Frame Bridge Construction Phase Seismic Response Analysis And Response Measures

In recent years, the global frequent earthquakes occur, and bridge engineering asone of the lifeline, once destroyed in the earthquake, it will seriously affect their normaloperation, resulting in huge economic losses. Therefore, the study of bridge seismicproblem is particularly important. Current bridge seismic has done a lot of research, butfor the construction phase of the seismic study is relatively small, due to the longerduration of the bridge during construction, may be encountered in the construction ofearthquake situation, so the continuous rigid frame bridge seismic studies and proposeimprovement measures during the construction phase of the bridge seismic in thepractical application of great significance.In this paper based on the basic theory of bridge seismic analysis, LiberationBridge as the engineering background, using the response spectrum method and thetime-history analysis of the seismic response analysis method of different stages ofbridge construction process, find out the corresponding measures to improve the seismic.This paper mainly studies the following aspects:â‘ Using the finite element software Midas Civil10.0Bridge construction phaseanalysis model, create two types of models with different boundary conditions (modelI:consider the pile-soil effect; model II:The pier at the end of consolidation) andvibration characteristics of analysis.â‘¡Bridge the various states response spectrum analysis and time-history analysis,the internal forces and displacements of each construction stage continuous rigid framebridge, and two calculation methods from the structure, and to explore the difference ofthe two methods in the calculation.â‘¢Based on the results of the analysis of the seismic response, the responsemeasures to improve the seismic performance of the bridge construction stage.The analysis shows that the two types of models:consider pile interaction, naturalvibration frequency of structure is decreased by about15%; the response spectrumanalysis, displacement model â…¡ value greater than about displacement model of value29%, and the model of axial force and pier pier shear compared with model I weredecreased by25%and15%, for structural earthquake resistant; showed that by contrasttime-history analysis and response spectrum analysis method, mainly during the construction phase of the seismic analysis to the time-history analysis responsespectrum analysis, giving the maximum value is controlled by the two results; seismicresponse analysis, the tie beam is set at a height of1/2to2/3of the pier is conducive toseismic.