CAJ | 학술논문

为研究水体对桥墩结构振动特性的影响，以ANSYS为计算平台，建立了桥墩-水流固耦合有限元模型，计算了不同几何尺寸和淹没比情况下桥墩的自振频率，分析了桥墩在高速列车作用下，不同水深对其振动特性的影响。分析后得出结论：当水体深度小于墩高50%时，桥墩的自振频率降低不明显；当水体高度大于墩高50%时，桥墩自振频率出现明显降低。高速列车作用下，桥墩墩顶纵向位移出现极值的时间，随淹没比的增加向后推迟；桥墩墩顶纵向加速度随淹没比的增加而增加。因此，高速列车作用下，水体对于涉水铁路桥梁桥墩的自振与动力振动特性有着明显的影响，且这种影响不可忽视。
위연구수체대교돈결구진동특성적영향，이ANSYS위계산평태，건립료교돈-수류고우합유한원모형，계산료불동궤하척촌화엄몰비정황하교돈적자진빈솔，분석료교돈재고속열차작용하，불동수심대기진동특성적영향。분석후득출결론：당수체심도소우돈고50%시，교돈적자진빈솔강저불명현；당수체고도대우돈고50%시，교돈자진빈솔출현명현강저。고속열차작용하，교돈돈정종향위이출현겁치적시간，수엄몰비적증가향후추지；교돈돈정종향가속도수엄몰비적증가이증가。인차，고속열차작용하，수체대우섭수철로교량교돈적자진여동력진동특성유착명현적영향，차저충영향불가홀시。
To research the effect of water on the vibration characteristics of bridge pier structure, this study built a bridge pier-water fluid-solid interaction finite element model based on the computing platform of ANSYS, calcu-lated the natural frequency of the bridge pier at different water depths, and then analyzed effects of water depths on the bridge pier vibration characteristics under the role of high-speed train. The conclusions drawn from the analysis were:when the water depth was less than 50%height of the pier, the natural frequency of bridge pier did not decrease significantly;when the water depth was higher than 50%height of the pier, the natural frequency of bridge pier reduced obviously;under high-speed train, with the increase of the water height the time of the longitu-dinal displacement extreme appeared lingeringly and the longitudinal acceleration of the pier increased. There-fore, it concludes that water structure has obvious effects on the static and dynamic vibration characteristics of bridge pier, which can not be neglected.