山地城市双层钢桁梁斜拉桥集约化设计研究

Research on Intensive Design of Double-deck Steel Truss Girder Cable-stayed Bridge in Mountainous City

摘要:

山地城市地形复杂，建筑密集，桥梁建设面临空间制约等挑战。以白居寺长江大桥为背景，研究复杂地形下双层钢桁梁斜拉桥的集约化策略，对桥位、桥型等总体布局以及主梁结构、索梁锚固的关键技术行对比分析。研究表明，规划桥位与桥型方案适应地形限制，采用双层桥面及桥站融合布局，实现了交通空间集约化。主梁选用倒梯形三角形桁架断面，能高效适配公轨复合交通需求，断面利用率高，用钢量较少，结构受力合理，施工安装便捷；索梁锚固采用双锚拉板锚箱式，传力明确且便于维护。白居寺长江大桥的集约化设计研究，可为同类山地城市公轨双层斜拉桥设计提供技术借鉴和工程范例。

Abstract:

The mountainous city has complex terrain and dense buildings, and the bridge construction faces challenges such as spatial constraints. Based on Baijusi Yangtze River Bridge, the intensive strategy of double-deck steel truss girder cable-stayed bridge under complex terrain is studied, and compares and analyzes the overall layout of bridge location and bridge type, as well as the key technologies of main girder structure and cable-girder anchorage. The research shows that the planned bridge location and bridge type scheme adapt to the terrain constraints, and the integrated layout of double deck and bridge station is adopted to realize the intensification of traffic space. The main girder adopts inverted trapezoidal triangular truss section, which can efficiently adapt to the demand of road-rail composite traffic. The section utilization rate is high, the steel consumption is small, the structural stress is reasonable, and the construction and installation are convenient. The cable-girder anchorage adopts double anchor plate anchor box type, which has clear force transmission and is easy to maintain. The intensive design research of Baijusi Yangtze River Bridge can provide technical reference and engineering example for the design of highway-rail double-deck cable-stayed bridge in similar mountainous cities.