CAJ | 학술논문

列车—桥梁系统的空气动力特性不仅受组合断面上的气动绕流影响，而且在顺桥向列车对桥梁的影响还呈现出非均匀性及动态变化。以高速列车通过铁路双线32 m 简支梁桥为例，分析头车前35 m至尾车后35 m范围内的桥梁三分力系数变化规律，得到了高速列车运行对该型桥梁不同位置断面空气动力特性的影响规律。研究发现，在任意时刻列车对铁路桥梁的空气动力特性影响都可划分为覆盖区、过渡区和无影响区3个区段，且随着列车在桥上的运行，列车对桥梁的影响区域在动态变化。提出了一种移动窗口模型方法来动态更新桥梁不同部位的气动力系数。该方法真正实现了列车—桥梁系统的动态气动耦合，能够更为精确地模拟风—车—桥系统耦合分析中的动态风荷载。
열차—교량계통적공기동력특성불부수조합단면상적기동요류영향，이차재순교향열차대교량적영향환정현출비균균성급동태변화。이고속열차통과철로쌍선32 m 간지량교위례，분석두차전35 m지미차후35 m범위내적교량삼분력계수변화규률，득도료고속열차운행대해형교량불동위치단면공기동력특성적영향규률。연구발현，재임의시각열차대철로교량적공기동력특성영향도가화분위복개구、과도구화무영향구3개구단，차수착열차재교상적운행，열차대교량적영향구역재동태변화。제출료일충이동창구모형방법래동태경신교량불동부위적기동력계수。해방법진정실현료열차—교량계통적동태기동우합，능구경위정학지모의풍—차—교계통우합분석중적동태풍하재。
T he aerodynamic characteristics of train-bridge system are affected by the aerodynamic flow on a hybrid cross section and the effect of vehicle on bridge presents a non-homogeneous and dynamic variation along the bridge direction. T aking the high speed train passing through railway double line 32 m simple-supported box-girder bridge as an example,the variation law of bridge three-component aerodynamic coefficients from 35 m ahead first vehicle to 35 m behind the last vehicle was analyzed and the influence law of high speed train movement on aerodynamic characteristics of different bridge cross section was obtained. T he results indicated that effect of train on aerodynamic characteristics of railw ay bridge could be divided into 3 sections including the coverage area,the transition zone and the non-influence area at any time and the influence area changes dynamically with the train passing through the bridge. T his paper presented a moving window model to dynamically update the aerodynamic coefficients of different bridge parts and has realized the dynamic aerodynamic coupling of vehicle-bridge system,which could precisely simulate the dynamic wind load of wind-vehicle-bridge coupling system.