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IJSTR >> Volume 8 - Issue 7, July 2019 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

The Effect Of Strengthening By Using Steel Ring Stiffeners On The Behavior Of The Cellular Beams With Large Web-Opening

[Full Text]



Hayder W. Ali, Ameer H. Muhammed



Cellular Steel Beams (LB), Parent section, Steel ring stiffeners, Ultimate load capacity (ULC), Web post-buckling and Vierendeel mechanism



the current study included an experimental and numerical study to assign the structural behavior of the cellular steel beams with and without strengthening by placing a steel ring stiffener around web-opening. IPE 140 hot rolled I-section steel beam was used to produce three specimens; the first without opening (control beam), the second was cellular beam without strengthening and the third beams was (LBD-R) with strengthening by steel ring stiffeners around opening with geometrical properties (Br=37mm and Tr=3mm). all cellular beams were fabricated with opening diameter (130mm) that result in expansion depth ratio (1.42), span length (1700mm) and ten openings. the results showed that cellular beam without strengthening was increased the ultimate load up to (31%) than the control beam (without opening) even in case of presenting a large opening and the failure was happened due to the web post-buckling. While the cellular beam with strengthening increased the ultimate load up to (147%) than the control beam and the failure mode that noted was the Vierendeel mechanism. On the other hand, the numerical study by finite element has shown that the increasing the ring thickness can be increased the ultimate load up to (172%) when using steel ring with thickness as the same as the web thickness (0.41 time of flange thickness) and after this value is not feasible economically.



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