Design Method of Initial Tension of Cables in Prestress-braced Steel Frame Structure

To study the design method of initial tension of cables in prestress-braced steel frame structure system, this structure system was theoretically analyzed. Formula of initial tension of cables in prestressbraced steel frame structure system was derived, it was obtained the relation of initial tension of cables and story drift angle. Based on inflexion point method, it was derived that formula of lateral stiffness of prestress-braced steel frame structure, lateral stiffness of the structure is related to material properties, section properties and angles between cables and horizontal plane. Based on the formulas derived in this paper, a design method of initial tension of cables in prestress-braced steel frame structure was proposed.Practicability of this method is proved through an example, this method can make sure the tension of cables is more than zero under designed exterior loads, and emergency capacity of cables is improved by30%.