Abstract
To study the design method of sectional area and initial tension of wire rope brace of the prestressed braced steel moment frame structure system, theoretical analysis of this structure system is conducted in this paper. The lateral stiffness formula is derived. It reveals the lateral stiffness is related to the lateral stiffness of bare steel moment frame, story height, the distance between column and lower end of brace, story drift, material properties and sectional properties of wire rope. The lateral stiffness increases with the growth of story drift and the relationship curve is a concave shape. It is presented the initial prestress degree design formula and method in light of the criterion for determining initial prestress degree. The story drift decreases with the growth of wire rope sectional area and the relationship curve is a concave shape, in terms of this, a wire rope sectional area design formula and method are proposed. The validation of the proposed design formula and method of wipe rope brace is proved by an example analyzed using finite element software package ABAQUS.
Highlights
Moment-resisting steel frames in regions of high seismicity are commonly designed to have high lateral stiffness to restraint the lateral story displacement within a specified range [1]
Integrating Eq (16) gives the function of the horizontal external load with respect to story drift as follows: where, p is the total number of stress-decreased wire rope brace (SDWRB), k is the number of SDWRB, AkC is the sectional area of SDWRB k, m is the total number of stress-increased wire rope brace (SIWRB), j is the number of SIWRB, AjC is the sectional area of SIWRB j
The prestressed braced steel moment frame (PBSMF), which has the wire rope braces with an assumed initial prestress degree and a sectional area given by second step, is analyzed
Summary
Moment-resisting steel frames in regions of high seismicity are commonly designed to have high lateral stiffness to restraint the lateral story displacement within a specified range [1]. Unexpected events, such as extremely severe earthquakes, might cause unacceptably large story drift. By optimizing the initial tensile force of wire ropes, PBSMF can prevent buckling from occurring in the bracing members. It is derived that the design formulas of sectional area and initial tensile force of wire rope brace in light of theoretical analysis results. Based on the specified story drift, a design method of sectional area and initial tensile force is proposed. 22 The Open Civil Engineering Journal, 2015, Volume 9 span PBSMF is conducted to validate the feasibility of the design method
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