Steel-concrete composite beams have been used in bridge construction for decades. Novel demountable bolted shear connectors, that allow bridge disassembly and offer high level of prefabrication, are proposed for the connection of the deck with the steel beams, as an alternative to the conventional headed studs. In terms of sustainability, bolted shear connectors facilitate the replacement of deteriorating bridge components and therefore extend the bridge design life. Despite their effectiveness, research on steel–concrete composite beams with bolted shear connectors is limited. In order to expand the available literature, this paper develops a three-dimensional finite element model to investigate the behaviour of a novel demountable shear connector for precast steel–concrete composite bridges. The connector uses high-strength steel bolts, which are fastened to the steel beam with the aid of a special locking nut configuration that prevents the slip of the bolts within their holes. The accuracy of the proposed FE model is validated by comparing its predictions with the experimental results available in the literature. Once validated, the FE model was then used to conduct a parametric study to evaluate the effect of bolt height, diameter and tensile strength, bolt pretension and the compressive strength of concrete on the load-slip behaviour, the shear resistance, the slip capacity and the stiffness of the shear connectors.

钢混混凝土梁在桥梁施工中已经使用了数十年。提出了新颖的可拆卸的螺栓剪切连接器，该连接器允许桥的拆卸并提供高水平的预制性，以替代甲板与钢梁的连接，以代替传统的带头螺栓。在可持续性方面，螺栓剪切连接器有助于更换劣化的桥梁部件，从而延长桥梁的设计寿命。尽管有效果，但对带螺栓剪切连接器的钢-混凝土组合梁的研究仍然有限。为了扩展现有文献，本文建立了一个三维有限元模型，以研究一种新型的可拆卸式剪力连接器用于预制钢-混凝土组合桥的性能。连接器使用高强度钢螺栓，通过特殊的锁紧螺母结构将其固定在钢梁上，以防止螺栓在孔中滑移。通过将其预测结果与文献中提供的实验结果进行比较，可以验证所提出的有限元模型的准确性。验证之后，然后使用有限元模型进行参数研究，以评估螺栓高度，直径和抗拉强度，螺栓预应力以及混凝土的抗压强度对荷载滑移特性，抗剪强度，滑移能力和抗压强度的影响。剪切连接器的刚度。通过将其预测结果与文献中提供的实验结果进行比较，可以验证所提出的有限元模型的准确性。验证之后，然后使用有限元模型进行参数研究，以评估螺栓高度，直径和抗拉强度，螺栓预应力以及混凝土的抗压强度对荷载滑移特性，抗剪强度，滑移能力和抗压强度的影响。剪切连接器的刚度。通过将其预测结果与文献中提供的实验结果进行比较，可以验证所提出的有限元模型的准确性。验证之后，然后使用有限元模型进行参数研究，以评估螺栓高度，直径和抗拉强度，螺栓预应力以及混凝土的抗压强度对荷载滑移特性，抗剪强度，滑移能力和抗压强度的影响。剪切连接器的刚度。