Seismic Response Analysis of Skew Bridge Road Widening
|School||Southwest Jiaotong University|
|Course||General and Fundamental Mechanics|
|Keywords||Bridge broaden Splice Xieqiao Shrinkage and creep Seismic Response Analysis Pile - soil - structure interaction|
With the rapid development of China 's reform and opening up and economic construction , a large number of roads and bridges, completed and put into operation early difficult to meet the requirements of the growing traffic . Widening of Old Bridge will be more and more present in the face of the builders , roads and bridges in the alteration process tend to be influenced by the surrounding existing buildings , in order to avoid the impact of existing buildings is sometimes necessary to adopt pier twill The special structure . Superstructure construction phase mechanical analysis and bridges overall seismic response analysis has a very important significance of this particular structure . Widen a highway skew bridge skew bridge seismic performance of the stress state of the system conversion stage , and broaden the engineering background to widen the bridge superstructure analysis , the main contents include : 1) bridge widening process precast beam time deposit and beams , bridges simple branched out into consecutive final spliced ??into force changes in the bridge process were analyzed and precast T beams reasonable deposit beam time and Newbridge part in the internal forces of the system conversion stage , displacement to meet the design requirements . 2) were established to consider and not consider pile mechanical model of a soil - structure interaction analysis of bridge vibration characteristics derived by the analysis of the pile - soil - structure interaction makes the bridge span structure becomes soft , the frequency decreases . 3) the use of the response spectrum method and time history analysis seismic response analysis of the bridge , explore the analysis of pile - soil - structure interaction on the seismic response of structures , calculation results show that the pile - soil - structure interaction reduces the bottom of the bridge pier internal forces , increasing the displacement of the top of the bridge piers . 4) the response spectrum and time history analysis method of bridge seismic response characteristics calculated results were compared , the results show that the use of the response spectrum method of bridge earthquake reflect the analysis of the pier displacement , internal force results slightly larger than the time history analysis method results Therefore , the calculated results using the response spectrum method is safe side .