Vol. 21, No. 6, pp. 542-550 (2025)
EVALUATION OF MECHANICAL PROPERTIES OF NEW MODULAR STEEL
CHANNEL TRUSS BEAMS UNDER ECCENTRIC LOADING
Shao-Chun Ma 1, 2, 3, *, Yi-Ming Liu 1, 3, Li Zhang 4 and Yun-Chi Xia 4
1 School of Civil Engineering and Architecture / Kaifeng Research Center for Engineering Repair and Material Recycle,
Henan University, Henan Kaifeng 475004, China
2 Yellow River Laboratory (Henan), Henan Zhengzhou 450000, China
3 Henan Province Research Center for Intelligence Conservation and Restoration of Historical Buildings,
Henan Kaifeng 475004, China
4 China Construction Seventh Engineering Bureau Co, Ltd, Henan Zhengzhou 450016, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 24 April 2024; Revised: 31 March 2025; Accepted: 6 May 2025
DOI:10.18057/IJASC.2025.21.6.7
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ABSTRACT
In order to address the challenges presented by the large size of conventional truss beams and the difficulties in hoisting, transportation, and installation. This paper proposes a new type of modular steel channel truss beams, which are formed by splicing the truss beam splices with high-strength bolts. This study conducted standard-load and overload destructive tests on six full-scale specimens under eccentric loads. It focused on the mechanical properties and damage characteristics of modular beams, along with evaluating the effectiveness of high-strength bolt splicing nodes. The results showed that the new type of modular steel channel truss beams possess excellent bending resistance and toughness. At the point where the ultimate bearing capacity is reached, the compression diagonal web buckles, causing damage to the modular beam. However, the high-strength bolt connection nodes remain intact. It shows that the overall toughness of the modular beam is significantly improved by the ability of the tensile action of connection nodes to absorb more deformation forces. The numerical model is established by simulation software and validated by comparing the calculations to the test results. The results are in close agreement, verifying the reliability of the finite element model. Additionally, the flexural performance of the modular beam is significantly influenced by the thickness of the compressed diagonal web. The flexural capacity of the composite beam depends on the critical load at which buckling damage occurs in the compressed diagonal web. Through numerical simulation, parameter optimization for the modular beam was conducted, and the optimal thickness of the compressed diagonal web was obtained. The calculation formula for the bending capacity applicable to the new modular beam is determined using the effective width method. This formula serves as the foundation for the theoretical design and practical engineering application of modular beams.
KEYWORDS
Channel steel modular beam, Mechanical property, Load-displacement curve, High-strength bolt, Numerical simulation
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