| Title | Slip-resistant performance and design method of novel steel one-sided bolted slip-resistant connections |
|---|---|
| ID_Doc | 15070 |
| Authors | Xu, KL; Yang, L; Mi, SD; Han, YW |
| Title | Slip-resistant performance and design method of novel steel one-sided bolted slip-resistant connections |
| Year | 2024 |
| Published | |
| Abstract | Modular steel systems, especially demountable steel structures, can alleviate the environmental pollution and reduce the overall lifecycle cost, thereby promoting the development of circular economy. Reliable one-sided bolts are essential for demountable steel structures with excellent mechanical performance. In this paper, an innovative triangular headed one-sided bolt (THOB) was invented and its slip-resistant performance was examined through the experimental and numerical studies on the double lapped joints. The test programmes mainly included the THOB torque coefficient determination test, the THOB strain relaxation monitoring test and the shear test. All the experiments were successively conducted on the five THOB bolted double lapped joint specimens, with the limit grooves and the preloads as the investigated parameters in the shear test. Finite element (FE) parameter analysis was then carried out by using the validated FE models to analyze the influences of the component plate thickness, the bolt pitch and the edge distance on the slip-resistant bearing capacity. It was found that an approximate value of 0.15 could be determined for the torque coefficient of the THOB, the bolt preload relaxation amount reached a stable level of approximately 6% after 48 h of tightening the THOBs, and the slip load was greatly impacted by the bolt preload, while the ultimate load showed minimal sensitivity to it. Furthermore, the slip-resistant bearing capacity of THOB bolted double lapped joints could be improved by increasing the component plate thickness, exhibiting more directionally-independent load-bearing performance than the joints using elliptical headed one-sided bolts and comparable performance with the joints using ordinary hexagonal headed bolts. Finally, a revised design approach was suggested to predict the slip-resistant bearing capacities of THOB bolted connections, taking account the yielding of the sections with minimum net areas in core plates and the stress concentration around bolt holes, which were assessed by comparing the design outcomes with those obtained from the respective design approaches specified in Eurocode 3, ANSI/AISC 360-22, AS 4100: 2020, and GB 50017-2017. |
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