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基于截面弯曲正应变分布的拟平截面假定及截面的轴力-弯矩-曲率(N-M-φ)关系,考虑了材料非线性、体外索与梁的应变不协调、体外索的二次效应等影响,编制了体外预应力波形钢腹板组合箱梁受弯全过程非线性分析程序。结合试验梁的全过程加载试验结果,研究表明:以混凝土开裂和受拉区普通钢筋屈服为分界点,体外预应力波形钢腹板组合箱梁受弯破坏全过程可分为明显的三个阶段:弹性阶段、开裂阶段、塑性阶段;编制的非线性程序能很好地预测了结构在极限状态下的承载能力和变形大小。研究还表明:体外索的二次效应对组合箱梁抗弯承载力影响较大,可通过设置跨中横隔板或转向块以减小其影响。
Based on the assumption of quasi-flat section and the NM-φ relationship of cross-section normal strain distribution, the material nonlinearity, the incompatibility between external cable and beam strain, the secondary effect of extra-corporeal cable and so on Influence, prepared the external prestressed corrugated steel web composite box beam bending the whole process of non-linear analysis program. Based on the experimental results of the whole process of the test beam loading, the results show that the whole process of the bending failure of the corrugated steel box girder with externally prestressed corrugated steel webs can be divided into three stages : Elastic phase, cracking phase and plastic phase. The nonlinear program prepared can well predict the bearing capacity and deformation of the structure under the limit state. The study also shows that the secondary effect of extra-corporeal cable has a great influence on the flexural capacity of composite box girders, and the impact can be reduced by setting transversal diaphragms or steering blocks.