Sustainable Composite Beam Behaviour with Deconstructable Bolted Shear Connectors
Sustainable Composite Beam Behaviour with Deconstructable Bolted Shear Connectors
复制标题
具有可解构螺栓剪力连接器的可持续复合梁行为
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M. Bradford
中科院分区：
文献类型：
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作者：
Michael Lee;M. Bradford
钢龙骨与混凝土板机械连接的组合结构作为楼面和桥面系统分别被广泛应用于建筑和桥梁中。在生命周期组合梁设计中，使用最先进的预制地聚合物混凝土板与创新的可拆解的先张法螺栓剪切连接件相结合，可以减少CO₂排放，从而提高建筑业的可持续性和可回收性。以往的研究大多是对具有不易解构的焊接剪力钉的组合梁进行的。在目前的研究中报道了一些推力试验，以确定螺栓剪切连接件的界面强度和刚度特性。说明了推力试验数据在预测复杂足尺组合梁性能时的应用，这三个不同的区域由界面剪切流力、界面摩擦系数和螺栓预紧力以及间隙孔相对于螺栓直径的大小来划分。基于一种简单的基于力学的“全-零-全”剪切相互作用机制，进行了初步的理论研究。
Composite structures using steel joists mechanically connected to concrete slabs serving as the flooring and decking systems are commonly used in buildings and bridges, respectively. The use of the state-of-art precast geopolymer concrete slabs coupled with innovative deconstructable pretensioned bolted shear connectors under service loads in a life-cycle composite beam design can reduce CO₂ emissions, thereby enhancing the sustainability in and recyclability of the construction industry. Most previous research has been conducted on composite beams with welded shear studs that cannot be deconstructed easily. A number of push tests are reported in the current study to establish the interface strength and stiffness characteristics of the bolted shear connectors. The application of the push test data in predicting complex full-scale composite beam behaviour with three distinctive regions that are delineated by the shear flow force at the interface, by the coefficient of friction at the interface and bolt pretension, and by the size of the clearance hole relative to the diameter of the bolt is explained. An initial theoretical investigation based on a simple mechanics-based “full-zero-full” shear interaction mechanism is presented and discussed.