Experimental study of composite beams having a precast geopolymer concrete slab and deconstructable bolted shear connectors
Experimental study of composite beams having a precast geopolymer concrete slab and deconstructable bolted shear connectors
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DOI：
10.1016/j.engstruct.2015.10.041
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发表时间：
2016-05-01
影响因子：
5.5
通讯作者：
Liu, Xinpei
中科院分区：
文献类型：
--
作者：
Ataei, Abdolreza;Bradford, Mark A.;Liu, Xinpei
传统的钢-混凝土组合梁在刚度和强度方面与裸钢或钢筋混凝土梁相比具有优异的结构特性。然而，在降低碳排放和提高材料回收利用的可能性的当前范例内，这种传统的组合梁不能被轻易地解构，并且它们的元件不可回收，因为它们依赖于封装在现浇混凝土内的焊接头螺栓连接件来实现必要的剪切连接。本文介绍了准静态试验的详细结果进行全尺寸的组合梁作为一种新的可解构和可持续的结构系统的一部分。对于这种系统，预制混凝土板连接到钢梁使用张紧高强度摩擦夹紧螺栓在间隙孔作为元件，以提供剪切连接。预制板使用地质聚合物混凝土代替普通波特兰水泥制成的混凝土制成，普通波特兰水泥的制造是全球人为二氧化碳排放的主要贡献者，从而增强了结构系统的低碳属性。试验结果表明，非常显着的梁的延性，与大量的界面滑移正在开发和维持在接近极限强度极限状态的负载。在螺栓中产生的张力在预制板和钢梁之间提供了足够的摩擦阻力，以确保组合系统在整个使用荷载范围内具有完全的剪切相互作用。它也被证实，组合梁与螺栓剪力连接件可以很容易地解构在其使用寿命结束时，与板，钢梁和螺栓可重复使用在其他结构应用。(C)2015爱思唯尔有限公司版权所有。
Traditional steel-concrete composite beams are known to exhibit excellent structural characteristics, in terms of their stiffness and strength, when compared with bare steel or reinforced concrete beams. However, within current paradigms of lowering carbon emissions and enhancing the possibly of material recycling, such traditional composite beams cannot be deconstructed easily and their elements are not recyclable because they rely on welded headed stud connectors that are encased within cast in situ concrete to achieve the necessary shear connection. This paper presents the detailed results of quasi-static tests conducted on full-scale composite beams as part of a novel deconstructable and sustainable structural system. For this system, precast concrete slabs are attached to a steel beam using tensioned high strength friction-grip bolts in clearance holes as the elements to provide the shear connection. The precast slabs are made using geopolymer concrete in lieu of concrete made from ordinary Portland cement, whose manufacture is a major contributor to anthropogenic CO2 emissions worldwide, thereby enhancing the low-carbon attributes of the structural system. The test results demonstrate the very significant ductility of the beams, with substantial interface slips being developed and sustained at loads close to the ultimate strength limit state. The tension induced in the bolts provides sufficient frictional resistance between the precast slabs and steel beams to ensure that the composite system has full shear interaction throughout the range of service loading. It is also confirmed that composite beams with bolted shear connectors can be deconstructed easily at the end of their service life, with the slabs, steel beams and bolts being reusable in other structural applications. (C) 2015 Elsevier Ltd. All rights reserved.