Main Article Content

Alyaa S. Alsultani
Najla'a H. Al-Shareef


This research experimentally investigates the flexural behavior of rectangular hollow flange cold-formed steel I-beam (RHFCFSIB) under two concentrated loads at the same distance from the support. All specimens were at a constant clear span of (L=1500mm), a constant beam specifications (t=4mm) web, flange thickness (h=300mm) for beam′s depth, and flange width of (bf=150mm). The connecting distance between the bolts, i.e., connects the web to the flanges, was (L/6), and eight stiffeners for each beam were placed under the load bearing points and at the support points on each side. The experimental program included assembling the parts to make beams and testing four specimens under two-point loads. The major parameters adopted in the current research included the flange depth, i.e., hf=30,60,90, and 120mm. The results showed that the beam with a flange depth of 30 mm had a higher ultimate load than other beams; however, it was the highest beam deflection. The beam with a flange depth of 120mm was the best section as a flexural member. The ultimate capacity of this beam increased by 15.34% and 6.4% compared to beams with flange depths of 60mm and 90mm and decreased by 12.9% compared to a beam with a flange depth of 30 mm. The maximum deflection at beam mid-span with a flange depth of 120 mm decreased by 53.8%, 44%, and 19.94% compared to beams with flange depths of 30 mm, 60mm, and 90mm, respectively. Therefore, the flange depth significantly influenced the flexural behavior by increasing the flange depth. Also, the ultimate capacity increased, and the deflection was reduced. The main conclusions drawn from the study were discussed and summarized. The research showed that the Hollow flanged sections gave the best results for flexural behavior.


Metrics Loading ...

Article Details

How to Cite
Alsultani, A. S., & Al-Shareef , N. H. (2023). Flexural Behavior of Rectangular Double Hollow Flange Cold-Formed Steel I-beam. Tikrit Journal of Engineering Sciences, 30(4), 28–35.


Sifan M, et al. Flexural Behavior and Design of Hollow Flange Cold-Formed Steel Beam Filled with Lightweight Normal and Light Weight High Strength Concrete. Journal of Building Engineering 2022; 48:103878. DOI:

Abou-Rayan AM, Khalil NN, Zaky AA. Experimental Investigation on the Flexural Behavior of Steel Cold-Formed I-Beam with Strengthened Hollow Tubular Flanges. Thin-Walled Structures 2020; 155: 106971. DOI:

Gardner L, Saari N, Wang F. Comparative Experimental Study of Hot-Rolled and Cold-Formed Rectangular Hollow Sections. Thin-Walled Structures 2010; 48(7): 495-507. DOI:

Keethan P, Mahendran M. Shear Tests of Rivet Fastened Rectangular Hollow Flange Channel Beam. Journal of Constructional Steel 2016; 121: 330-340. DOI:

Gao F, Zhu HP, Zhang DH, Fang TS. Experimental Investigation on Flexural Behavior of Concrete-Filled Pentagonal Flange Beam under Concentrated Loading. Thin -Walled Structures 2014; 84: 214-225. DOI:

Gao F, Yang F, Liang H, Zhu H. Numerical Study and Strength Model of Concrete-Filled High-Strength Tubular Flange Beam under Mid Span Load. Engineering Structures 2021; 229: 111654. DOI:

Gao F, Yang F, Zhu H, Liang H. Lateral-Torsional Buckling Behavior of Concrete-Filled High Strength Steel Tubular Flange Beams under Mid-Span Load. Journal of Constructional Steel Research 2021; 176: 106398. DOI:

Pi YL, Trahair NS. Lateral-Distortional Buckling of Hollow Flange Beams with Web Stiffeners. Journal of Structural Engineering, ASCE 1997; 123(6):695-702. DOI:

Tondini N, Morbioli A. Cross- Sectional Flexural Capacity of Cold-Formed Laterally-Restrained Steel Rectangular Hollow Flange Beams. Thin-Walled Structures 2015; 95: 196-207. DOI:

Hassanein MF, Kharoob OF, EL Hadidy A. 4. Lateral–Torsional Buckling of Hollow Tubular Flange Plate Girders with Slender Stiffened Webs. Thin-Walled Structures 2013; 65: 49-61. DOI:

Hassanein MF, Silvertre N. Lateral-Distortional Buckling of Hollow Tubular Flange Plate Girders with Slender Unstiffened Webs. Engineering Structures 2013; 56: 572-584 . DOI:

Hassanein MF, Kharoob OF. Flexural Strength of Hollow Tubular Flange Plate Girders with Slender Stiffened Webs under Mid-Span Concentrated Loads. Thin-Walled Structures 2013; 69: 18-28. DOI:

Kim BG, Sause R. Lateral Torsional Buckling Strength of Tubular Flange Girders. Journal of Structural Engineering 2008; 134(6): 902-910 . DOI:

Perera N, Mahendran M. Section Moment Capacity Tests of Hollow Flange Steel Plate Girders. Journal of Constructional Steel Research 2018; 148: 97-111. DOI:

Perera N, Mahendran M. Finite Element Analysis and Design for Section Moment Capacities of Hollow Flange Steel Plate Girders. Thin-Walled Structures 2019; 135: 356-375. DOI:

Tang X, Ma H. A Study on Bolted Connection of Built-Up I-Shaped Member Consisting of Double Thin-Walled Cold-Formed Lipped Channels. 4th International Conference on Advances in Steel Structures 2005 June 13-15; Shanghai, China; 1: 523-528. DOI:

Usamah MS, Abbas HM, Marwa ZK, Kamaran SA. Finite Element Investigation of the Ultimate Capacity of Hollow-Flange Steel Girders with Web Openings. Diyala Journal of Engineering Sciences 2022; 15(2): 19-30. DOI: