Horizontal pushout tests and parametric analyses of a locking-bolt demountable shear connector
Horizontal pushout tests and parametric analyses of a locking-bolt demountable shear connector
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DOI：
10.1016/j.istruc.2021.11.041
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发表时间：
2022-01
期刊：
影响因子：
4.1
通讯作者：
Jun-Jun He-Jun;Ahmed S. H. Suwaed;G. Vasdravellis
中科院分区：
文献类型：
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作者：
Jun-Jun He-Jun;Ahmed S. H. Suwaed;G. Vasdravellis
为便于钢-混凝土组合结构的解构和再利用，提出了一种锁定螺栓可拆卸剪力连接件(LBDSC)，以实现更可持续的建筑设计范式。LBDSC由一个灌浆钢管和一个几何上兼容的部分螺纹螺栓组成。后者的几何结构将螺栓锁定在预钻在钢法兰上的兼容孔中，并消除了初始滑移和施工公差问题。LBDSC的结构性能是通过使用水平测试装置进行的九次推出测试来评估的。研究了钢管厚度、混凝土板强度和灌浆强度对LBDSC抗剪性能、初始刚度和延性的影响。试验结果表明，与传统的焊接螺栓相比，LBDSC具有更高的抗剪强度和相似的初始刚度。此外，所有测试的LBDSC的滑移能力从14 mm到32 mm不等，可以根据欧洲规范4归类为延性剪力连接件。还创建了详细的有限元模型，发现该模型可以可靠地再现实验行为。随后使用经过验证的模型进行了参数研究，以进一步研究参数并推广实验结果。由于特定的试验设置，连接器中产生了不可忽略的上拔力，并对其潜在影响进行了讨论。
A ‘locking-bolt’ demountable shear connector (LBDSC) is proposed to facilitate the deconstruction and reuse of steel-concrete composite structures, in line with achieving a more sustainable construction design paradigm. The LBDSC is comprised of a grout-filled steel tube and a geometrically compatible partially threaded bolt. The latter has a geometry that ‘locks’ the bolt in compatible holes predrilled on the steel flange and eliminates initial slip and construction tolerance issues. The structural behaviour of the LBDSC is evaluated through nine pushout tests using a horizontal test setup. The effects of the tube thickness, strength of concrete slab, and strength of infilled grout on the shear resistance, initial stiffness, and ductility of the LBDSC are assessed. The experimental results show that the LBDSC can achieve higher shear resistance and similar initial stiffness as compared to traditional welded studs. In addition, all tested LBDSCs exhibited slip capacities ranging from 14 to 32 mm and can be classified as ductile shear connectors according to Eurocode 4. A detailed finite element model was also created and found to be reliable to reproduce the experimental behaviour. Parametric studies were subsequently conducted using the validated model to study further parameters and generalise the experimental results. Due to the specific test setup, non-negligible uplift forces were generated in the connector and the potential implications are discussed.