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首页> 外文期刊>Journal of Constructional Steel Research >A comparative study of continuous steel-concrete composite beams prestressed with external tendons: Experimental investigation
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A comparative study of continuous steel-concrete composite beams prestressed with external tendons: Experimental investigation

机译：体外索预应力钢-混凝土连续组合梁的比较研究：试验研究

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A comparative study of prestressed continuous steel-concrete composite beams is carried out based on an experimental investigation. Four full-scale continuous composite beams were tested, among which two were two-span beams and two were three-span beams. One of the two-span beams was a conventional non-prestressed composite beam, and the other was a composite beam prestressed with external tendons in both the positive and negative moment regions. One of the three-span composite beams was non-prestressed, and the other was prestressed only in the negative moment regions with external high-strength tendons. The cracking behaviors, distortional lateral and local buckling as well as the load carrying capacity of the beams were investigated experimentally. Full plasticity was developed at the mid-span section of each beam; however, the maximum moments attained at the internal supports were governed by local buckling, which is related to the slenderness of the composite section. It is found that in hogging rnmoment regions, the ultimate moment resistance of a composite beam prestressed with external tendons is governed by either distortional lateral buckling or local buckling, or an interactive mode composed of distortional lateral and local buckling. The results show that exerting prestressing on a continuous composite beam with external tendons increases the degree of the internal force and moment redistribution in the beam. A design proposal based on moment redistribution to evaluate the load carrying capacity of continuous composite beams with external tendons is proposed.
机译：在实验研究的基础上进行了预应力钢-混凝土连续组合梁的对比研究。测试了四个全尺寸连续组合梁，其中两个是两跨梁，两个是三跨梁。两跨梁中的一个是常规的非预应力复合梁，另一个是在正弯矩区域和负弯矩区域均预应力为外部筋的复合梁。三跨组合梁之一未施加预应力，另一根仅在具有外部高强度筋的负弯矩区域受到预应力。实验研究了梁的开裂行为，横向和局部屈曲变形以及梁的承载能力。在每个梁的中跨部分都具有完全可塑性。但是，内部支撑处获得的最大力矩受局部屈曲的控制，这与复合材料段的细长性有关。结果发现，在预弯弯矩区域中，预应力受外部筋束作用的复合梁的极限抗弯强度由变形侧向屈曲或局部屈曲或由变形侧向屈曲和局部屈曲组成的相互作用模式控制。结果表明，在具有外部筋的连续组合梁上施加预应力会增加梁内力和弯矩重新分布的程度。提出了一种基于弯矩重分布的设计方案，以评估带有外部筋的连续组合梁的承载能力。

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