CAJ | 학술논문

研究局部地形条件对地震作用下车桥耦合系统动力响应的影响。依据黏弹性边界理论，利用 ANSYS 建立了可以考虑局部地形条件的三维场地模型，并通过将输入地震动转化为作用于人工边界上的等效荷载来实现波动输入，得到考虑地形影响之后的桥梁各支点地震动时程曲线。将地震激励以速度时程和位移时程形式作用到结构上，编制计算程序，进行多点地震激励作用下的车桥耦合分析。以列车通过总长480 m 的实际桥梁为算例，对考虑局部地形影响的车桥耦合系统地震响应进行了仿真分析。结果表明：考虑地形影响后，地震作用下桥梁和车辆的动力响应在峰值大小和峰值出现时间上均发生了改变，且其变化规律随桥梁所处的地形类型的不同而有所差别，说明进行车桥耦合系统地震响应分析时考虑局部地形影响的必要性。
연구국부지형조건대지진작용하차교우합계통동력향응적영향。의거점탄성변계이론，이용 ANSYS 건립료가이고필국부지형조건적삼유장지모형，병통과장수입지진동전화위작용우인공변계상적등효하재래실현파동수입，득도고필지형영향지후적교량각지점지진동시정곡선。장지진격려이속도시정화위이시정형식작용도결구상，편제계산정서，진행다점지진격려작용하적차교우합분석。이열차통과총장480 m 적실제교량위산례，대고필국부지형영향적차교우합계통지진향응진행료방진분석。결과표명：고필지형영향후，지진작용하교량화차량적동력향응재봉치대소화봉치출현시간상균발생료개변，차기변화규률수교량소처적지형류형적불동이유소차별，설명진행차교우합계통지진향응분석시고필국부지형영향적필요성。
The influences of topography on the dynamic response of a train-bridge system under earthquake were studied.According to the theory of visco-elastic artificial boundary,a 3-D finite element site model accounting for topographic effects was established by using ANSYS.The process of wave input was realized by converting the seismic time history into equivalent loads acting on the artificial boundary,the seismic time history curve at each support of the bridge was obtained.The dynamic analysis of the train-bridge coupled system subjected to multi-support seismic excitations was performed,the velocity and displacement time histories of seismic excitations were exerted on the bridge supports.With a train passing through a 480 m-bridge as a case study,the dynamic responses of the train-bridge coupled system under earthquakes considering local topography were simulated.The results showed that the peak value and the time of peak appearance for the dynamic response of the train-bridge system vary and the variation laws are different due to different topographic effects,so it is necessary to consider topographic effects in dynamic analysis of train-bridge coupled systems under earthquakes.