The flexural bearing capacities of three composite continuous box beams with different prestressing degrees were tested and studied to investigate the influences of local prestressing bundles on the deflection, relative slip of interface, strain, and redistribution of the internal force of the steel–concrete composite continuous box beam. Results show that the arrangement of local prestress can not only improve the bending stiffness at the mid-span of the composite continuous box beam, but also significantly enhance the ductility. In the design process of the local prestressed composite continuous box beam, the influence of the slip at the middle support should be fully considered, and the deflection could not be taken as a control factor. The internal force redistribution of the local prestressed continuous box beam is lower than that of the ordinary continuous box beam, but it still has good plastic internal force redistribution. The number of prestressing bundles in the negative moment region is the main factor that affects the internal force redistribution of the middle support.

中文翻译：

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局部预应力钢-混凝土组合连续箱梁抗弯性能试验研究

试验研究了三种不同预应力程度的组合连续箱梁的抗弯承载力，研究了局部预应力束对钢-混凝土组合连续梁挠度、界面相对滑移、应变和内力再分布的影响。箱梁。结果表明，局部预应力的布置不仅可以提高组合连续箱梁跨中处的抗弯刚度，而且显着增强了延性。在局部预应力组合连续箱梁设计过程中，应充分考虑中间支座滑移的影响，不能将挠度作为控制因素。局部预应力连续箱梁的内力重分布低于普通连续箱梁，但仍具有良好的塑性内力重分布。负弯矩区预应力束的数量是影响中间支座内力再分布的主要因素。