RESEARCH STATUS AND PERSPECTIVE ON EXTERNALLY PRESTRESSED STEEL-CONCRETE COMPOSITE BEAMS
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.