CAJ | 학술논문

桂平郁江特大桥是南宁至广州铁路的重点工程之一,位于西江航运干线贵港至桂平河段,跨郁江主桥为(36+96+228+96+36)m五跨连续钢桁斜拉桥。设计速度250 km/h,为有砟轨道双线桥梁。由于桂平郁江钢桁斜拉桥的主梁和桥塔间采用纵向无约束的漂浮体系,列车制动及地震会引起主梁纵向较大的振动位移和桥塔根部较大的纵向弯矩,影响桥梁的正常使用和安全。文章以桂平郁江钢桁斜拉桥为例,对钢桁梁斜拉桥在列车制动力和地震作用下,粘滞阻尼器对结构振动响应的影响进行了详细的分析,结果表明：粘滞阻尼器能显著减小列车制动及地震作用下主塔塔顶位移及主梁位移,具有较好的减振效果；粘滞阻尼器能较好控制结构在塔梁连接处的内力,特别对主塔控制截面的弯矩及剪力改善较为明显,能够保证大桥的正常运行和安全。
계평욱강특대교시남저지엄주철로적중점공정지일,위우서강항운간선귀항지계평하단,과욱강주교위(36+96+228+96+36)m오과련속강항사랍교。설계속도250 km/h,위유사궤도쌍선교량。유우계평욱강강항사랍교적주량화교탑간채용종향무약속적표부체계,열차제동급지진회인기주량종향교대적진동위이화교탑근부교대적종향만구,영향교량적정상사용화안전。문장이계평욱강강항사랍교위례,대강항량사랍교재열차제동력화지진작용하,점체조니기대결구진동향응적영향진행료상세적분석,결과표명：점체조니기능현저감소열차제동급지진작용하주탑탑정위이급주량위이,구유교호적감진효과；점체조니기능교호공제결구재탑량련접처적내력,특별대주탑공제절면적만구급전력개선교위명현,능구보증대교적정상운행화안전。
Guiping Yujiang River super major bridge is one of the key projects of Nanning Guangzhou railway, located in Guigang-Guiping reach of Xijiang shipping route. The main bridge crossing Yujiang River is a (36 +96 +228 +96 +36) m five span continuous steel trussed cable-stayed bridge. It’s a ballasted double track bridge with the design speed of 250 km/h. As the longitudinal unconstrained floating system is used between the girder and bridge tower of Yujiang steel truss cable-stayed bridge, train braking and earthquake will cause large longitudinal vibration displacement of gird-er and larger longitudinal bending moment of tower root, which shall have influence on normal operation and safety of the bridge. This paper takes Guiping Yujiang steel trussed cable-stayed bridge as an example, under the action of train bra-king force and earthquake, the influence of viscous damper on the structural vibration response is analyzed in detail, the results show that the viscous damper can markedly reduce the pylon top displacement and the girder displacement, hav-ing better damping effect;preferably control the internal force at joint of tower and girder, especially improve the ben-ding moment and shearing force of control section of the main tower, ensure the normal operation and safety of the bridge.