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Johor Bahru, Malaysia

Khiabani M.H.,Steel Technology Center | Md Tahir M.,Steel Technology Center | Md Noor N.,Steel Technology Center
Advanced Science Letters | Year: 2012

Inverted chevron-braced frames (IVBF), notwithstanding their high strength and rigidity, do not exhibit great ductile behavior and proper energy dissipation. To achieve a desirable seismic performance, a new configuration by adding vertical elements to chevron-braced frames is proposed in 1988, so-called zipper-braced frames (ZBF). In these frames, zipper columns connecting the intersection points of the braces above the first story, transfer the vertical unbalanced force due to the buckling of first story compression brace to upper stories and mobilize them to resist this force. This paper presents an analysis of elasto-plastic behavior of suspended ZBF using two design methods, strength based and capacity based, and a pushover analyses of models to determine inelastic strength and advantages of ZBF in comparison with IVBF. Using capacity design, ZBF showed a higher ductility and better energy dissipation with buckling of more braces and lower contingency to collapse due to form soft-story mechanism, whereas they exhibit almost the same behavior as IVBF using strength design. © 2012 American Scientific Publishers. All rights reserved.

Ngian S.P.,Steel Technology Center | Tahir M.M.,Steel Technology Center | Siang T.C.,Steel Technology Center | Hong A.K.B.,Steel Technology Center | Mohammad S.,Steel Technology Center
Advanced Science Letters | Year: 2012

Cold-formed steel section has been widely used in Malaysia especially for the construction of roof truss system as an alternative to timber truss. The use of timber is no longer popular recently due to the increase in cost, not environmental friendly, prone to termite attack, and lesser strength to weight ratio as compared to steel. This paper describes experimental test results of the proposed cold-formed steel sections for the use in roof truss system. The tests were performed to meet the requirements that have been outlined by Public Works Department, Malaysia and were compared to BS 5950: Part 5. It was concluded from the study that the experimental results showed good agreement with the formulation given in BS 5950: Part 5. Hence the proposed cold-formed steel sections and the connections are suitable to be used as an alternative solution for the roof truss system. © 2012 American Scientific Publishers. All rights reserved.

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