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http://dx.doi.org/10.12989/scs.2018.28.2.139

Enhancing seismic performance of ductile moment frames with delayed wire-rope bracing using middle steel plate  

Ghalandari, Akram (University of Sistan and Baluchestan, Department of Civil Engineering)
Ghasemi, Mohammad Reza (University of Sistan and Baluchestan, Department of Civil Engineering)
Dizangian, Babak (Velayat University, Department of Civil Engineering)
Publication Information
Steel and Composite Structures / v.28, no.2, 2018 , pp. 139-147 More about this Journal
Abstract
Moment frames have considerable ductility against cyclic lateral loads and displacements; however, sometimes this feature causes the relative displacement to exceed the permissible limits. This issue can bring unfavorable hysteretic behavior on the frame due to the reduction in the stiffness and resistance against lateral loads. Most of common bracing systems usually control lateral displacements through increasing stiffness while result in decreasing the capacity for energy absorption. This has direct effect on hysteresis curves of moment frames. Therefore, a system that is capable of both having the capacity of energy absorption as well as controlling the displacements without a considerable increase in the stiffness is quite important. This paper investigates retrofitting of a single-storey steel moment frame using a delayed wire-rope bracing system equipped with the ductile middle steel plate. The steel plate is considered at the middle intersection of wire ropes, where it causes cables to be continuously in tension. This integrated system has the advantage of reducing considerable stiffness of the frame compared to cross bracing systems as a result of which it could also preserve the frame's energy absorption capacity. In this paper, FEM models of a delayed wire-rope bracing system equipped by steel plates with different geometries have been studied, validated, and compared with other researchers' laboratory test results.
Keywords
seismic; ductile moment frames; delayed; wire-rope bracing; middle steel plate;
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Times Cited By KSCI : 2  (Citation Analysis)
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