Web-crippling Strength of Multi-web Cold-formed Steel Deck Sections Subjected to End One Flange (EOF) Loading (original) (raw)
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Co ld-formed steel sections (CFS) are subjected to different buckling modes. This work presents the results of structural reliability analysis of web crippling strength expression currently used in the Brazilian Standard, with a particu lar focus on I-sections (Stiffened Flanges) beams subjected to the loading conditions of Interior-One-Flange (IOF). Previous research studies of web crippling showed that I-sections members fastened to the bearing plate (support), subjected to IOF load case, presented inadequate reliability indexes (β) when compared to the target reliab ility index. Experimental data of I-sections members reported in the literature were analyzed to obtain the professional factor statistics. The First-Order Reliab ility Method (FORM) was used for the standard calibration procedure. The reliability analysis was developed for load combinations found in the North American and the Brazilian standards, in addition to the nominal live-to-dead load ratio, L n /D n , equal to 3 and 5. Target reliability indexes usually used in the calibration of the main international standards for CFS members were considered. It was found that the resistance factor present in the Brazilian standard should be increased for the I-sections members. A revision is necessary to standardize the level of s afety of the design to the limit state of the web crippling.
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Web crippling strength of Cold Formed Steel Z-Sections Subjected to Interior One Flange Loading
Engineering Research Journal - Faculty of Engineering (Shoubra), 2021
This paper presents an experimental and numerical investigation into web crippling resistance of unfastened cold formed steel Z-sections subjected to Interior One Flange (IOF). Both Z-sections have stiffened and unstiffened flanges were studied. This paper presented the results of 12 test specimens considering the IOF loading condition. A verified finite element models were developed to simulate the experimental tests. An extended parametric study was carried out based on the verified finite element models. The parametric study included the different factors affecting the web crippling resistance such as; material yield stress, web thickness, inside bend radius, web depth and bearing load length to thickness ratios. The web crippling strength according to the Eurocode EN 1993-1-3 and the North American specification AISI S100-16 were compared to the experimental and the finite element results. The comparisons showed that the two specs; Eurocode EN 1993-1-3 and AISI S100-16 overestim...
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