García Ismael, Serrano Miguel A, López-Colina Carlos, Suárez Jesús M, Gayarre Fernando L
Department of Construction and Manufacturing Engineering, University of Oviedo, 33203 Gijón, Spain.
Materials (Basel). 2021 Mar 15;14(6):1429. doi: 10.3390/ma14061429.
The use of Rectangular Hollow Sections (RHS) as columns in steel construction includes important advantages like higher mechanical strength and fire resistance. However, the practical demountable bolted joints between beams and columns are not easy to execute, due to impossibility of access to the inner part of the tube. The use of threaded studs welded to the face of the tube and bolted to the beam by means of angle cleats is one of the cheaper and most efficient solutions to obtain beam-column joints with a semi-rigid behavior, as is usually sought in building structures. Nevertheless, it is important to point out that the stud-diameter and the stud-class selection may affect the mechanical properties of the welded parts of the joint. In this paper, 8MnSi7 (with a commercial designation K800) and 4.8 threaded studs were welded to RHS steel tubes and mechanical properties on the weld, the Heat Affected Zones (HAZ), and the base metal were obtained in two different ways: through a correlation with the Vickers hardness and by means of the Small Punch Test (SPT). A study of the microstructure and tensile tests on the threaded studs and in the columns was also carried out. The research involved different types of stud qualities, tube wall thicknesses, and stud diameters. The work presented in this paper proved that in most cases, the welded joint between these studs and the RHS steel tubes present a reasonable static behavior that fulfils the requirements for the beam-column joints under static loading.
在钢结构中使用矩形空心截面（RHS）作为柱体具有诸多重要优势，如更高的机械强度和耐火性。然而，梁与柱之间实用的可拆卸螺栓连接难以实现，因为无法触及管体内部。在管体表面焊接螺柱并通过角形夹板与梁螺栓连接，是获得具有半刚性性能的梁柱节点的较为经济高效的解决方案之一，这也是建筑结构中通常所追求的。尽管如此，需要指出的是，螺柱直径和螺柱等级的选择可能会影响节点焊接部件的机械性能。本文将8MnSi7（商品名为K800）和4.8级的螺柱焊接到RHS钢管上，并通过两种不同方式获得焊缝、热影响区（HAZ）和母材的机械性能：通过与维氏硬度的相关性以及借助小冲孔试验（SPT）。还对螺柱和柱体进行了微观结构研究和拉伸试验。该研究涉及不同类型的螺柱质量、管壁厚度和螺柱直径。本文所开展的工作证明，在大多数情况下，这些螺柱与RHS钢管之间的焊接节点呈现出合理的静态性能，满足静载作用下梁柱节点的要求。
