| The curved bridge is one of the important bridges in Chinese communicationsconstruction which has been widely used in more complex mountain area and urbanoverpass system. With the requirements for improving the ability to provide smooth andcomfort ride in recent years, the construction of high pier small radius curved longbridge began to increase. Seismic waves received by the foundations of this bridgesystem may be very different, to a large extend, the consistent seismic model is difficultto meet with the actual affection that from seismic, it is urgent to do some research onthe multi-point seismic excitation model and its response.In this paper, starting from the typical curved bridge engineering, inquiring intocharacteristics of how the high pier curved bridge seismic system compose and itssuspension; establishing the Space-time coupling dynamical model; applying largefinite element software for numerical simulation analysis, and making research on thedynamic response of small radius curved bridge under the consistent or multi-pointseismic excitation respectively; also studying how the design parameters such as theradius of curvature, the pier height, as well as the length of bridge, the apparent wavevelocity affect the seismic response. The main tasks are as follows:1.Discussing the common type of disaster and site of injury, failure modes that mayoccur when bridge suffers from the earthquake; analyzing the composition and themechanical characteristics of curved bridge system and its difference with straightbridge.2.Studying of earthquake wave input mode; calculating the seismic response of highpier small radius curved bridge under the consistent incentive and multi-point excitationfrom different earthquake waves; researching the law of extent and impact of internal forces and displacement on the high pier small radius curved bridge which affected bythe multi-point earthquake excitation with comparison and analysis.3. Discussing the computer-implemented method of multi-point earthquake excitation;developing the method to calculate the structural dynamic response correctly andreasonably by making use of large finite element software and the quality of the theory,also imitating simulation of traveling wave effect.4. Researching on how apparent velocity affect the multi-point seismic excitationresponse of high pier small radius curved bridge. To calculate and compare differentapparent velocity such as200m/s,400m/s and700m/s,1400m/s, conclude withcorrespondent mechanical characteristics and more dangerous wave velocity byanalyzing changes of the internal forces and displacements.5. Researching how these design parameters such as radius of curvature, pier, bridgelength affect the seismic effect of the curved bridge by changing them and comparativeanalyzing the dynamic response of curved bridge under multi-point earthquakeexcitation. |
