Vol. 20, No. 1, pp. 21-29 (2024)
ANALYSIS OF THE DYNAMIC MECHANISM OF SQUARE TUBULAR
T-JOINTS WITH CHORD FLANGES SUBJECTED TO IMPACT LOADING
Peng Deng 1, 2, Dong-Song Chang 2, Xiu-Long Chen 3, Zhong-Yi Zhu 4, * and Raheel Asghar 2
1 Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China
2 College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
3 School of Civil Engineering, Southeast University, Nanjing, China
4 Beijing Institute of Architectural Design, Beijing 100055, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 29 April 2023; Revised: 31 May 2023; Accepted: 27 August 2023
DOI:10.18057/IJASC.2024.20.1.3
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ABSTRACT
This study examines the dynamic mechanical properties of square tubular T-joints with impact loads acting on the chord surface in the joint area. The study first verified the failure modes and behaviors of the specimens under a brace axial force and impact, respectively, where the simulation results demonstrated good agreement with the experimental results. A total of 138 square hollow section tubular T-joint finite element models were divided into T1, T2, and T3 groups based on different tube diameter ratios. The failure modes, displacement-time history curves, and impact force-time history curves were obtained. The results revealed that the joint deformation modes were primarily characterized by significant local indentation at the impact site and junction of the chord and brace, as well as a certain degree of deformation at both ends of the chord. Within a certain range, the preloaded axial force could mitigate the development of plastic deformation, whereas an increased ratio of the drop hammer length to chord diameter exacerbated it. Finally, theoretical analysis was simplified by defining the plastic element set, and the energy dissipation coefficient ψ was proposed to evaluate the impact resistance of square tubular T-joints by analyzing the specific energy changes in the intersecting region (El) and at the ends of the chord (Ee).
KEYWORDS
Square tubular T-joint, Impact loading, Preloading axial force, Energy dissipation
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