Abstract
The paper implements a method for analyzing the stress-strain state of rectangular hollow sections (RHS) by finite-element modeling (FEM) of tests for three-point bending and torsion. Design schemes, 3-D solid-state and deformable models have been developed using the automated analysis and CAD/CAE system software, made it possible to obtain equivalent stress distributions and displacements in models. A simulation of tests for RHS with a cross section of 40 mm × 50 mm, manufactured in two ways, was carried out: (a) by direct-forming of galvanized steel strips on roll-forming mill in a semi-closed section with a longitudinal gap of 0.5 mm between the edges formed on a 40 mm web (DF-RHS); (b) similar direct-forming to the closed section and next welding the edges to a longitudinal weld along the web middle of 50 mm (DFW-RHS). RHS with various wall thicknesses (t = 1.93 mm, 1.84 mm and 0.7 mm) was investigated, given the design features that depend on the manufacturing processes of structural sections. It was found DFW-RHS is stiffer by at least 50% compared to DF-RHS, which allows to savings the metal by reducing the RHS wall thickness by 62% while maintaining the same stiffness and ensuring high strength of structural section.
Highlights
Rectangular hollow sections (RHS) are great importance for much purposes, such as construction and reinforced concrete structures, uPVC window systems of buildings and constructions, some areas of civil or mechanical engineering, shipbuilding, etc. [1,2,3]
Based on the finite-element modeling (FEM) using, RHS with a cross section of 40 mm × 50 mm was investigated, that have a difference in manufacturing options by direct-forming (DF-RHS) with longitudinal gap and direct-forming with the edge welding (DFW-RHS) into longitudinal weld seam
It was found that the existing initial differences affect to the results: (a) the gap at DF-RHS is located in the middle of the width of the smaller web (40 mm), and the weld seam at DFW-RHS is in the middle of the width of the larger web (50 mm); (b) the average wall thickness of DF-RHS is t = 1.93 mm, and DFW-RHS is t = 1.84 mm
Summary
Rectangular hollow sections (RHS) are great importance for much purposes, such as construction (load-bearing frames, columns, posts) and reinforced concrete structures, uPVC window systems of buildings and constructions, some areas of civil or mechanical engineering, shipbuilding, etc. [1,2,3]. Changing the design of the structural section [40,41,42] or introducing of consistent direct-forming with longitudinal welding of the edges of the closed section requires evaluation of the indices of stiffness and strength (stresses) of RHS to identify the advantages or disadvantages of new processes. (b) 40*50 DFW-RHS – as closed sections and subsequent welding of the edges with the longitudinal weld on the middle of the web (face) with a size of 50 mm Comparing these types of RHS with the gap and the weld will allow to see differences in the behavior of products of similar cross-section and different variants of manufacture with differences in thickness, and, as a consequence, to evaluate the prospects of reducing the material consumption of the DFW-RHS while ensuring equivalent stiffness. The geometric parameters of the model are fully consistent with the full-scale specimens (Fig. 2) and are made in a scale of 1:1 (for geometric similarity)
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