CAJ | 학술논문

该文对列车通过铁路桥梁时,桥梁主梁横向振动响应的动力放大系数的测试进行了研究。文中采用简谐激励Feq sinωt作为列车的横向摇摆力作用在铁路桥梁上以确定桥梁主梁横向动力放大系数。根据现有研究结果,在不同车速作用下,将轮对作用在桥梁钢轨顶部的横向集中力的最大值作为简谐激励幅值,并对该横向集中力的时程曲线做功率谱变换,得到横向集中力的主频范围。分别将该简谐激励作用在桥梁第一跨跨中、第二跨1/4跨及第二跨跨中时的主梁跨中动力放大系数,测试结果表明,铁路桥梁在车速不超过120 km/h 的情况下,动力放大系数最大值不超过1.3,桥梁结构的动力响应能满足主梁横向刚度的要求。
해문대열차통과철로교량시,교량주량횡향진동향응적동력방대계수적측시진행료연구。문중채용간해격려Feq sinωt작위열차적횡향요파력작용재철로교량상이학정교량주량횡향동력방대계수。근거현유연구결과,재불동차속작용하,장륜대작용재교량강궤정부적횡향집중력적최대치작위간해격려폭치,병대해횡향집중력적시정곡선주공솔보변환,득도횡향집중력적주빈범위。분별장해간해격려작용재교량제일과과중、제이과1/4과급제이과과중시적주량과중동력방대계수,측시결과표명,철로교량재차속불초과120 km/h 적정황하,동력방대계수최대치불초과1.3,교량결구적동력향응능만족주량횡향강도적요구。
In the paper,experimental research on dynamic magnification factor of the transverse vibration responses of bridge girder was studied when train pass through railway bridge.In order to determine the transverse dynamic am-plification factor of bridge girder,harmonic excitation Feq sinωt was used as transverse swaying force of train to act on railway bridges.According to current research results,in the role of different speed,the maximum horizontal concen-tration of wheels acting on the top of a bridge rail is taken as harmonic excitation amplitudes,and the force-time curve of transverse centralized power was done spectrum transformation to get the frequency range of the transverse concen-tration.The harmonic excitation was respectively acted on the dynamic magnification factor of the main beam of the first cross-span,the second 1/4 cross-span and the second cross-span of the bridge.The testing results show that the maximum dynamic amplification factor of the railroad bridge is at most 1.3,and the dynamic response of the bridge structure can meet the requirements of the main beam lateral stiffness when the train passing at the speed of no more than 120 km/h.