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为了改善组合箱梁桥杆系模型研究尚不成熟的现状,提出了组合箱梁桥的杆系模型。首先以分格室结构的剪力-柔性梁格理论为基础,确立了构件层次和截面层次的建模策略;进而以简支组合箱梁桥和连续组合箱梁桥、直线组合箱梁桥和曲线组合箱梁桥为研究对象,分别建立精细模型和杆系模型,进行模态分析、恒载和活载作用下的静力分析。研究结果表明:精细模型和杆系模型的计算结果吻合良好,杆系模型具有良好的准确度与适用性;研究成果为杆系模型在实际组合箱梁桥设计分析中的应用奠定了基础。
In order to improve the research status of the system of composite box girder bridge system, the system model of composite box girder bridge is proposed. Firstly, based on the shear-flexible lattice theory of sub-cell structure, the modeling method of component level and cross-section level is established. Then, by using simply supported composite box girder bridge and continuous composite box girder bridge, Curve composite box girder bridge as the research object, respectively, to establish a fine model and the rod system model, modal analysis, static load and live load under static analysis. The results show that the calculation results of the fine model and the rod model are in good agreement, and the rod model has good accuracy and applicability. The research results provide the basis for the application of the rod model in the design and analysis of the actual composite box girder bridge.