Vol. 21, No. 3, pp. 204-217 (2025)
NUMERICAL STUDY AND EVALUATION OF THE SHEAR CAPACITY OF
SCREW DOUBLE-SHEAR CONNECTIONS
Wen-Hao Liu 1, 2, Lu Deng 2, 3, Yu-Long He 2, *, Tao Wang 1, 2 and Huan Liu 2
1 Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,
Southeast University, Nanjing 210096, China
2 College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China
3 Key Laboratory for Damage Diagnosis for Engineering Structures of Hunan Province,
Hunan University, Changsha 410082, Hunan, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 18 March 2024; Revised: 6 January 2025; Accepted: 8 January 2025
DOI:10.18057/IJASC.2025.21.3.3
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ABSTRACT
Previous studies have primarily focused on the performance of screw single-shear connections (SSCs) and rarely investigated the performance and calculation methods of screw double-shear connections (DSCs). The first study examines the effect of various parameters on the shear capacity of single-screw DSCs. The results indicate that the steel strength, steel plate thickness, screw diameter, and connection method have significant effects on the shear capacity of thin steel screw DSCs. Specifically, when the steel strength increases from 235 MPa to 550 MPa, the maximum increase in the shear capacity is 81.2%. An increase in steel plate thickness from 0.8 mm to 3.0 mm results in a minimum increase of 34.6% in shear capacity. Similarly, increasing the screw diameter from 3.5 mm to 6.3 mm leads to at least a 35.2% increase in shear capacity. Moreover, changing from the SSC to DSC can result in a maximum increase of 95.4% in shear capacity. Next, the shear performance of screw group DSCs is analyzed parametrically. It is found that when the steel plate thickness is 3.0 mm and the number of screws increases to 3, the failure mode transitions from a coupled bearing and shear failure to bearing failure. Additionally, when the number of screws increases from 2 to 5, the shear capacity of screw group DSCs increases by at least 9.6%. The effect of screw spacing on shear capacity decreases as the number of screws increases, while variations in screw arrangement have minimal impact on shear capacity. Furthermore, increasing the steel plate thickness from 0.8 mm to 1.2 mm results in a minimum 51.1% increase in shear capacity, and increasing the thickness from 1.2 mm to 3.0 mm leads to at least an 88.0% increase in shear capacity. Finally, the results of the parametric analyses are used to evaluate the applicability of design equations for screw DSCs. The findings indicate that the AISC specification provides accurate predictions for single screw DSCs, regardless of whether bearing or shear failure occurs. In contrast, for screw group DSCs, the AISC predictions tend to be conservative when the specimen experiences coupled bearing and shear failure, and unsafe when bearing failure occurs.
KEYWORDS
Double-shear connections (DSCs), Screw group connection, Shear capacity, Failure modes, Design formula
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