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RISS 인기검색어
- 검색키워드
- 저자 : Mir Basar Suhaib (검색결과 2 건)
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Behaviour of GFRP Stiffened Cold-Formed Steel Built-up Beams
Mir Basar Suhaib,M. A. Tantray 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.4
This article explores a novel approach to inhibit local premature failures in cold-formed steel (CFS) beams and enhance their fl exural capacity by introducing external web stiff eners to buckling prone regions. An experimental and fi nite element investigation on the behaviour of doubly symmetric CFS built-up channel beams with adhesively bonded glass-fi ber reinforced polymer (GFRP) stiff eners is presented in this paper. Unlike previous attempts, where fl at plates have been used, the results of pultruded T-shaped GFRP stiff eners on the fl exural capacity and local failure inhibition of the CFS beams are presented. The viability of suggested strengthening arrangement is assessed by comparing the results from CFS beams strengthened with steel stiff eners of equivalent stiff ness. One control and six reinforced beams, stiff ened with diff erent confi gurations of both steel and GFRP stiff eners in the moment span, were tested up to failure under four-point bending. The change in the mode of failure from buckling at discrete regions to global failures with an improvement in the fl exural capacity by up to 39% was achieved using adhesively bonded external stiff eners in the present study. It can be concluded that adhesively bonded GFRP stiff eners provide a cost-eff ective and adequate alternative to enhance the fl exural performance and inhibit the local failures in thin-walled beams. Finite element models were developed and verifi ed against test results. FE models were found to be capable of predicting the ultimate capacity and failure of stiff ened beams with fair accuracy.
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Flexural Integrity Between the Individual Channels of Built-Up Cold-Formed Steel Beams
Mir Basar Suhaib,Manzoor Ahmad Tantray 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2
This paper investigates the influence of commonly used screw connections on the integrity of built-up beams formed by connecting two lipped channel sections in a back-to-back configuration. An experimental investigation on the behaviour of 6 built-up CFS beams connected by self-drilling screws is presented in this paper. The screw spacing was varied along the length as well as the depth of the beams. The test results indicate that the screw spacing has some influence on the capacity of the built-up beams. An increase in screw spacing leads to an undesirable separation of channels and thus has a negative impact on the composite action between the members. Finite element models were developed and after successful validation, a parametric study involving 124 models was carried out, to investigate the impact of larger longitudinal screw spacings on the integral behaviour of the beams. It was observed that the flexural capacity decreased by 11%, 14%, 17% and 19% when the longitudinal distance between the screws increased from 50 to 1050 mm for beams with web depths 150 mm, 200 mm, 250 mm and 300 mm respectively. It can be concluded that flexural capacity is directly proportional to the decrease in the screw spacing and increase in the number of screw rows. The results also indicate that the percentage decrease in strength is greater for beams with larger web depths. An idealized cross section assuming complete composite action was simulated for each web depth using FE modelling and the capacities of all the screw-connected “semi-rigid” beams were compared against it. The capacity of screw connected built-up beams with web depths 150 mm, 200 mm, 250 mm and 300 mm was found to be 0.71, 0.64, 0.61 and 0.59 times that of the idealized cross-section on average, respectively. The moment capacities of screw-connected beams were also compared against the theoretical values obtained from AISI S-100. It was observed that the design guidelines provided in AISI S-100 were unable to account for the reduction in the moment capacity due to the screw connection in built-up members. AISI S-100 is conservative by as much as 34%, 42%, 46% and 48% for beams with web depths 150 mm, 200 mm, 250 mm and 300 mm respectively.
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