Study On Anti-seismic Of Continuous Rigid Frame Bridge

Along with the rapid development of Chinese economy has entered high rack. Development of transport networks are rapidly up Now a large number of bridges being built home, Continuous Rigid Frame Bridge have been a lot of choice for bridge-type bridge design because of its unique characteristics. Earthquake situation is too complexity because of their geographic environment determine. China’s seismic activity is characterized by wide distribution, high-intensity, high-frequency, light source, once the earthquake disaster, the damage will be very strict. Bridge works as a lifeline project, its seismic capacity should arouse our attention. In this paper, the construction of a highway under the bridge as the basis, establishment the computational model of continuous rigid frame bridge, analysis of the continuous rigid frame bridge seismic response characteristics. According to seismic design code of the implementation of the first bridge in the E1 and E2 earthquake seismic response analysis,obtain continuous rigid frame bridge seismic response characteristics. Both the analysis and comparison of the response spectrum method and time history analysis result of the operation, what kind of simulation method for seismic analysis results more valuable.The main contents are as follows:1. Summarizes the analysis include static method, response spectrum method and dynamic time-history analysis of bridge structure, Describes bridge seismic design process, the method and process of earthquake input should be noted.2. The bridge is calculated in E1 and E2 earthquake seismic response, And extract the top 30 were analyzed vibration mode. Through the analysis of the resulting bridge formation known: Two-stage formation of the bridge before the greatest impact, its first-order formation mainly longitudinal drift, the second-order transverse bending formation in the main;3. Calculated using the response spectrum method in the E1 and E2 bridge earthquake seismic response, derived structure under E1, E2 earthquake girder, pier section of the control of internal forces and displacements, respectively, each pier top, pier section of the control of internal forces and displacements of each pier top. Compare the size of the structure of the internal forces and displacements in the E1, E2 earthquake generated.4. According to the characteristic period of the bridge area, When selecting an area characterized by three cycles of the field period seismic waves similar reaction process analysis. And the response spectrum by the following structural seismic intensity and E2 largest earthquake peak acceleration of seismic waves by a factor adjustment. Midas software use seismic waves, respectively, in three structural seismic shear, moment, displacement and deformation analysis.5. Internal forces and displacements of the control section structures were analyzed and compared the response spectrum method and the two calculation methods history analysis method derived. Finally, after comparing the average of greater value to select between the two, or both.