RESEARCH STATUS AND PERSPECTIVE ON EXTERNALLY PRESTRESSED STEEL-CONCRETE COMPOSITE BEAMS
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摘要: 体外预应力钢-混凝土组合梁是一种将现代预应力技术和普通钢-混凝土组合梁结合在一起的新型承重构件,与普通钢-混凝土组合梁相比,它主要有六大优点：1) 提高极限承载力;2) 扩大弹性工作范围;3) 提高疲劳和断裂性能;4) 充分利用材料性能,降低结构高度和自重;5) 减小使用荷载下的变形;6) 有利于混凝土裂缝的控制。该文系统综述了国内外学者在体外预应力钢-混凝土组合梁结构方面取得的研究成果,并对有待进一步研究的工作进行了展望。Abstract: An externally prestressed steel-concrete composite beam is a new type of structural member combining a steel-concrete composite beam and prestressing technique. Compared with traditional steel-concrete composite beams, prestressed steel-concrete composite beams have six major advantages: 1) increasing the ultimate loading capacity; 2) extending the elastic range of structural behavior; 3) improving the fatigue and fracture behavior; 4) fully utilizing the materials and reducing the structural height and weight; 5) decreasing the deformation under service loading; 6) being helpful to the crack-width control. Based on the review of available research work of externally prestressed steel-concrete composite beams, the research projects to be conducted are proposed.
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