Shear behavior of lap connection using T-head square-neck one-side bolts
Year: 2026
Type: article
Abstract: To advance the understanding of the shear behavior of T-head Square-neck One-side bolt (TSOB) bolted lap connections, this paper presents a systematic experimental and finite element investigation. Ten groups of specimens with different parameters were designed and tested under static loading. The failure modes and ultimate resistance were predicted using Eurocode 3–1-8 and subsequently compared with test outcomes. The experimental results, including failure modes, load-displacement relationships, and strain development patterns, were analyzed in detail. A Finite Element Model (FEM) was developed and validated against the test data. Utilizing the validated FEM, key parameters influencing the shear resistance of the connections were further examined. The results show that TSOB lap connections exhibit two primary failure modes: bolt shear failure and hole-wall bearing failure. The governing failure mode depends on the plate thickness and the orientation of the bolt hole. Bolt pretension is found to influence only the resistance during the slip phase, with negligible effect on the ultimate resistance. While Eurocode 3–1-8 provides accurate predictions for connections with vertical bolt holes, it shows significant deviation in estimating the bearing resistance of horizontal bolt holes. Consequently, a modified theoretical model for predicting the bolt-hole bearing resistance of horizontal bolt-hole connections is proposed, which demonstrates good agreement with test and numerical results.
Authors: Xinhua Wang, Siqi Wang, Lele Sun, Jiayu Wu
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,310
Awards: G1069660869, G911736458
OpenAlex ID: W7129101602