摘要
渝湘高铁太子坪乌江大桥为主跨300 m无砟轨道双塔混合梁斜拉桥,主跨及部分边跨主梁为钢-混组合梁,其余为混凝土梁。针对铁路桥恒载重、主梁宽高比小的特点,钢-混组合梁采用单箱单室“大风嘴”截面,节省了造价,便于施工和后期养护。桥塔为钻石形钢筋混凝土结构,采用钻孔灌注桩基础。斜拉索采用标准抗拉强度1 860 MPa镀锌钢绞线拉索,斜拉索与钢-混组合梁采用锚拉板锚固,与混凝土梁采用齿块锚固。该桥采用半飘浮体系,塔梁间纵向约束采用新型带熔断装置的锁定装置和液体黏滞阻尼器2种组合控制体系,提高了结构整体刚度,结构受力较优,降低了温度效应的不利影响。与轨道适应性相关计算结果表明,结构强度和刚度均满足规范要求;风-车-桥耦合振动仿真计算与分析结果表明,结构满足高速铁路行车安全性和舒适性要求。
The Taiziping Wujiang River Bridge of Chongqing-Hunan High-speed Railway,which is a two-pylon cable-stayed bridge with a main span of 300 m,carries ballastless tracks.The superstructure consists of the steel-concrete composite girders in the main and part of the side spans and the concrete girders in the remaining spans.To accommodate the heavy dead loads and small width-to-depth ratio of superstructure of the railway bridge,the steel-concrete composite girders are single-cell box girders with large wind fairings,which is considered a cost-saving solution and beneficial to the construction and future maintenance.The pylons are diamond-shaped reinforced concrete structures supported by bored pile foundations.The stay cables that are composed of galvanized steel strands with nominal tensile strength of 1 860 MPa are anchored to the steel-concrete composite girders via tensile plates and to the concrete girders via concrete wedges.The bridge is of a semi-floating system,where a new type of fuse lockout devices and liquid viscous dampers are used in combination to restrict the longitudinal movement between the pylons and the superstructure,as a result,the overall stiffness of the structure is enhanced,the load bearing performance of the structure is optimized and the unfavorable thermal effect is scaled down.The calculations of the track adaptability demonstrate that the strength and stiffness of the structure meet the code requirements.The numerical simulation of the wind-vehicle-bridge coupling vibration indicates that the bridge meets the safety and running comfort requirements of high-speed railway.
作者
曹洪武
王应良
秦煜
CAO Hong-wu;WANG Ying-liang;QIN Yu(CREEC(Chongqing)Survey,Design and Research Co.,Ltd.,Chongqing 400023,China;China Railway International Group Co.,Ltd.,Beijing 100039,China)
出处
《世界桥梁》
北大核心
2022年第6期1-6,共6页
World Bridges
基金
重庆市社会事业与民生保障科技创新专项(cstc2016shmszx30014)
中铁二院科学技术研究计划项目(KYY2019061)。
关键词
高速铁路桥
无砟轨道
斜拉桥
钢-混组合梁
新型“大风嘴”截面
斜拉索锚固
约束体系
桥梁设计
high-speed railway
ballastless track
cable-stayed bridge
steel-concrete composite girder
new type cross-section of large wind fairing
stay cable anchorage
restraint system
bridge design
