波形钢腹板-钢管组合箱梁受力性能分析

Analysis on Mechanical Performance of Corrugated Steel Web-Steel Pipe Composite Box Girder

结合传统波形钢腹板组合箱梁和钢桁架的优点,将传统波形钢腹板组合箱梁下缘混凝土底板改进为钢管桁架结构,提出一种波形钢腹板-钢管组合箱梁新型结构形式。该结构充分发挥材料优势,具有自重轻、抗震性能好、结构抗裂性和整体性能优异的优点,同时施工方便,施工工艺灵活,更适合在城市中、小跨径梁桥中使用。将该组合结构应用于某一实际工程中,采用有限元软件对其抗弯性能和结构模态进行分析,并对比研究了钢管内填充混凝土与否对结构受力性能的影响。结果表明:钢管内填充混凝土可以有效增加结构整体刚度,改善结构受力。分析成果应用于工程设计和施工,取得了良好的工程经济效益和社会效益,可供类似工程进行参考借鉴。

Combined with the advantages of traditional corrugated steel web composite box girder and steel truss, the concrete bottom plate of the traditional corrugated steel web composite box girder is improved into a steel pipe truss structure. A new structural form of corrugated steel web-steel pipe composite box girder is proposed. This structure gives full play to the advantage of materials and has the advantages of light dead weight, good seismic performance, excellent structural crack resistance and overall performance. At the same time, the construction is convenient and the construction process is flexible. It is more suitable for use in urban mid-and small-span beam bridges. The composite structure is applied to a practical project, and its flexural performance and structural modal are analyzed by finite element software. The influence of the steel pipe filled with concrete on the mechanical performance of the structure is compared and studied. The result shows that the steel pipe filled with concrete can effectively increase the overall stiffness of the structure and improve the structural stress. The analysis results applied to the engineering design and construction have achieved the good economic and social benefits of the project, which can be referred for the similar projects.