体外预应力钢-混凝土组合梁

在钢-混凝土组合梁中采用体外预应力技术,具有提高组合梁的刚度以及承载能力,减小混凝土的收缩徐变开裂,提高结构的耐久性等优点。近年来,国内已相继建造了采用体外预应力组合梁的城市桥梁和结构,但在体外预应力钢-混凝土组合梁的受力性能、施工和使用阶段的受荷机理以及设计和应用方面仍存在许多有待解决的问题。回顾了国内外体外预应力组合梁研究及应用进展,对一些关键技术进行了论述,可供研究及设计人员参考。

STEEL-CONCRETE COMPOSITE BEAMS WITH EXTERNALLY PRESTRESSED TENDONS

The advantages of applyin g prestressing in steel-concrete c omposite beams with externally prestressed tend ons have been recognized,such as in creasing the stiffness and load ca rrying capacity of the beams,reduc ing shrinkage and creep cracks in concrete,and improving the durabil ity of the structures.Although the composite beams with externally prestressed ten dons have been applied in several o verpass bridges and buildings in C hina recently,yet there are many p roblems in forced performance,loading mechanism during construction and use,theory and design methods for the structures,which need to be so lved.In this paper,the development in research and application of the field is reviewed,and several key problems are commented and discuss ed,which may be referenced by rese archers and designers.