Structural Performance of Double castellated Steel Beams with Innovative Opening Configuration
Received: 27 November 2024 | Revised: 22 December 2024 and 3 January 2025 | Accepted: 6 January 2025 | Online: 3 April 2025
Corresponding author: Ayat Naji
Abstract
This research delves into the structural performance of castellated steel beams featuring expanded webs, emphasizing how design variables, such as the number of openings and cutting angle, affect the load capacity, deflection, and stiffness. Castellated beams are engineered to improve the strength-to-weight ratio of the standard I-beams by cutting and reconstructing the web into hexagonal, rectangular, or circular openings. This configuration not only boosts the beam load capacity and minimizes weight, but also maintains or enhances stiffness, rendering it well-suited for long-span structures. In the present study, seven beam specimens were tested under one-point load conditions, including six castellated beams. The key findings demonstrate that reducing the number of openings significantly increases the load capacity and reduces deflection. The castellated beams outperformed RB-S by up to 68.9% in the load-carrying capacity at Service Limit Deflection (SLD). Additionally, the study examined the influence of cutting angles (58°, 52°, and 45°) on the beam performance, concluding that a 52° angle provided the best balance between strength and stiffness. The results underscore the importance of optimizing castellated beam designs for large-scale construction applications, where balancing weight reduction, structural integrity, and serviceability is crucial.
Keywords:
castellated beams, vierendeel mechanisms, web post-buckling, number of openingsDownloads
References
Castellated and Cellular Beam Design. USA: American Institute of Steel Construction, 2016.
S. Durif, A. Bouchaïr, and O. Vassart, "Experimental and numerical investigation on web-post specimen from cellular beams with sinusoidal openings," Engineering Structures, vol. 59, pp. 587–598, Feb. 2014.
M. Liu, M. Liang, Q. Ma, P. Wang, and C. Ma, "Web-post buckling of bolted castellated steel beam with octagonal web openings," Journal of Constructional Steel Research, vol. 164, Jan. 2020, Art. no. 105794.
І. Підгурський, М. Підгурський, О. Підлужний, and В. Слободян, "ДОСЛІДЖЕННЯ ТРИМКОЇ ЗДАТНОСТІ БАЛОК З ОДНОРЯДНОЮ ТА ДВОРЯДНОЮ ПЕРФОРАЦІЄЮ РІЗНОЇ КОНФІГУРАЦІЇ," Містобудування та територіальне планування, no. 78, pp. 426–434, Oct. 2021.
H. W. Al-Thabhawee, "Experimental investigation of composite steel–concrete beams using symmetrical and asymmetrical castellated beams," Curved and Layered Structures, vol. 9, no. 1, pp. 227–235, Jan. 2022.
V. N. Jadhav, R. R. Kurlapkar, and A. P. Patil, "Assessment of lateral-torsional buckling capacity of mild steel castellated beam with sinusoidal web openings," Asian Journal of Civil Engineering, vol. 25, no. 5, pp. 4081–4090, Jul. 2024.
Z. Li, H. Pasternak, and F. Shi, "Shear buckling behavior of sinusoidal corrugated web girders with stiffened circular openings," Journal of Constructional Steel Research, vol. 221, Oct. 2024, Art. no. 108872.
F. A. Abass and A. M. Al Khekany, "Effect of Concrete Slab on Built-up Double Web Castellated Steel Beam under Combined Flexural and Torsion Load," Salud, Ciencia y Tecnología - Serie de Conferencias, no. 3, Jun. 2024, Art. no. 840.
N. Y. Abbas and A. J. H. Alshimmeri, "Numerical Study of Performance of Alternate Closed Opening Castellated Beam Using Double Steel Channel Shapes," International Information and Engineering Technology Association, pp. 457–463, Feb. 2024.
N. Y. Abbas and A. J. H. Alshimmeri, "Flexural Behavior of a Composite Concrete Castellated Double Channel Steel Beams Strengthening with Reactive Powder Concrete," Tikrit Journal of Engineering Sciences, vol. 31, no. 2, pp. 28–42, Apr. 2024.
F. A. Abass and A. M. Al-Khekany, "Behavior of built-up double web castellated steel beam subjected to out of plane loads," AIP Conference Proceedings, vol. 3219, no. 1, Nov. 2024, Art. no. 020048.
A. Ahmed and A. M. I. Said, "The Effect of Opening Size and Expansion Ratio on the Flexural Behavior of Hot Rolled Wide Flange Steel Beams with Expanded Web," Engineering, Technology & Applied Science Research, vol. 14, no. 1, pp. 13033–13040, Feb. 2024.
K. M. Karthick and D. G. Arunkumar, "Theoretical and Numerical Investigation of Cold Formed I Section Castellated Beam with Hexagonal Openings," International Journal of Engineering Research & Technology, vol. 6, no. 3, Mar. 2017.
R. Pr and D. G. Arunkumar, "Investigation of Cold - Formed I - Section Castellated Beam with Cellular Openings," International Journal of Engineering Research & Technology, vol. 6, no. 2, Feb. 2017.
S. Prabhakaran and S. A. Maboob, "Numerical Analysis and Experimental Investigation on Behavior of Cold-Formed Steel Castellated Beam with Diamond Castellation," International Journal of Steel Structures, vol. 21, no. 3, pp. 1082–1091, Jun. 2021.
M. A. Gulam and A. J. H. AlShimmeri, "Structural Behavior Castellated 2C Cold-Formed Steel Beams," Journal of Engineering, vol. 30, no. 05, pp. 151–171, May 2024.
M. A. Gulam and A. J. H. Alshimmeri, "Numerical analysis of castellated 2C cold-formed steel beams," AIP Conference Proceedings, vol. 3219, no. 1, Nov. 2024, Art. no. 020045.
B. Anupriya, K. Jagadeesan, and B. Saranya, "Effect of Stiffeners on Castellated Beams," Asian Journal of Research in Social Sciences and Humanities, vol. 6, no. 12, pp. 30–37, Dec. 2016.
H. W. Al-Thabhawee and A. Mohammed, "Experimental study for strengthening octagonal castellated steel beams using circular and octagonal ring stiffeners," IOP Conference Series: Materials Science and Engineering, vol. 584, no. 1, Dec. 2019, Art. no. 012063.
C. S. Reddy, M. K. Kumar, G. Madhavarao, R. Thirumalairaja, and C. Manikandan, "Behavior of Castellated Beams with and Without Stiffeners," International Journal of Innovative Research in Computer Science & Technology, vol. 8, no. 5, pp. 394–399, Sep. 2020.
K. Pawar and P. Kumbhar, "Performance Analysis of Castellated Steel I-Beam using FRP Stiffeners," International Journal for Research in Applied Science and Engineering Technology, vol. 10, no. 2, pp. 1134–1142, Feb. 2022.
P. D. Kumbhar and A. M. Jamadar, "Comparative study on load carrying capacities of castellated beams provided with mild steel and CFRP stiffeners," Materials Today: Proceedings, Mar. 2023.
A. S. Mahdi and A. J. H. Alshimmeri, "Analytical study of castellated steel beams with and without strengthening web," AIP Conference Proceedings, vol. 2839, no. 1, Sep. 2023, Art. no. 03005.
A. A. Hussein and A. J. H. Alshimmeri, "Comparative Study of Structural Behavior for Asymmetrical Castellated (Concavely - Curved Soffit) Steel Beams with Different Strengthening Techniques," Key Engineering Materials, vol. 895, pp. 177–189, 2021.
R. M. Abbas and H. J. Shakir, "Finite Element Investigation on Shear Lag in Composite Concrete-Steel Beams with Web Openings," Journal of Engineering, vol. 21, no. 3, pp. 11–33, Mar. 2015.
K. A. Al-Billbassi and M. F. K. Al-Shamaa, "Behavior of High Strength Hybrid Reinforcement Concrete Beams," International Journal of Integrated Engineering, vol. 12, no. 7, pp. 254–267, Oct. 2020.
W. A. Salah, "Performance of Hybrid Castellated Beams: Prediction Using Finite Element Modeling," Engineering, Technology & Applied Science Research, vol. 12, no. 2, pp. 8444–8451, Apr. 2022.
Z. H. Dakhel and S. D. Mohammed, "Castellated Beams with Fiber-Reinforced Lightweight Concrete Deck Slab as a Modified Choice for Composite Steel-Concrete Beams Affected by Harmonic Load," Engineering, Technology & Applied Science Research, vol. 12, no. 4, pp. 8809–8816, Aug. 2022.
A. J. H. Alshimmeri and H. N. G. Al-Maliki, "Structural Behavior of Reinforced Concrete Hollow Beams under Partial Uniformly Distributed Load," Journal of Engineering, vol. 20, no. 07, pp. 130–145, Jun. 2023.
S. K. Al-Tameemi and A. J. Alshimmeri, "Behavior of asymmetrical castellated composite girders by gap in steel web," AIP Conference Proceedings, vol. 2414, no. 1, Feb. 2023, Art. no. 060002.
M. A. Shamaa, A. J. H. A. Shimmeri, and A. Lazem, "Lateral bracing and steel shear wall integration in steel high-rises," Magazine of Civil Engineering, vol. 123, no. 7, pp. 105–117, 2023.
A. Ahmed and A. M. I. Said, "The Effect of Expansion Ratio, Opening Size, and Prestress Strand on the Flexural Behavior of Steel Beams with Expanded Web using FEA," Engineering, Technology & Applied Science Research, vol. 14, no. 3, pp. 14257–14265, Jun. 2024.
M. F. K. AlShamaa, M. G. Ghaddar, M. M. Jebur, A. Al-Rumaithi, A. J. Hussain Alshimmeri, and M. Karkush, "Evaluating the Structural Integrity of Cellular Steel Beams with Web Enhancements," IOP Conference Series: Earth and Environmental Science, vol. 1374, no. 1, Dec. 2024, Art. no. 012088.
N. Y. Abbas and A. J. H. Alshimmeri, "Numerical Study of Composite Concrete Castellated Double Channel Beams with Strengthening Techniques," Journal of Engineering, vol. 30, no. 02, pp. 30–51, Feb. 2024.
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