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本文以跨径30米的装配式钢筋混凝土斜腿连续箱梁设计为例,从抗扭刚度、荷载横向分布和工程材料等方面分析了结构特点。并对计算图式及设计假定,构造影响线、荷载横向分布系数,内力和应力计算等进行了阐述和公式推导。作者认为这种桥型具有建筑高度低、截面刚度大、抗扭性能好、荷载分布均匀、予制和运输安装简便等优点。其经济指标比同跨径的予应力T梁、组合箱形梁为佳。
In this paper, the design of continuous reinforced concrete box girder with span of 30 meters is taken as an example. The structural features are analyzed from the aspects of torsional stiffness, load lateral distribution and engineering materials. The calculation schema and design assumptions, the influence lines of construction, the transverse distribution coefficient of load, the calculation of internal forces and stress are also discussed and the formulas are deduced. The authors believe that this type of bridge has the advantages of low building height, large cross-section stiffness, good anti-torsion performance, uniform load distribution, pre-fabrication and transportation and installation. Its economic indicators than the same span of the prestressed T beam, combo box beam is better.