International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 07 | July 2023
p-ISSN: 2395-0072
www.irjet.net
STRUCTURAL BEHAVIOUR OF SQUARE AND ELLIPTICAL CROSS SECTIONS OF STEEL TUBULAR COLUMNS WITH DECONSTRUCTABLE SPLICE JOINT Nehana V.G1, Krishnachandran V.N2 1P.G Student, M. Tech in Structural Engineering, N.S.S College of Engineering, Kerala, India 2Assistant Professor, Department of Civil Engineering, N.S.S College of Engineering, Kerala, India
---------------------------------------------------------------------***--------------------------------------------------------------------emerge [12]. Deconstructable structural design also refers to Abstract - A steel tubular column is a vertical structural
member used in construction to provide essential support. Splice joint is a method of joining two members end to end. When the material being joined cannot be obtained in the desired length, the splice joint is used. For high rise buildings the continuity of columns may break, hence splice connections are provided and columns are installed. Splice joints are deconstructable type joints as the failed parts can be repaired, reassembled or can be even removed. Deconstructable steel structure system possesses good construction efficiency and quality. This paper focuses on developing models of square and elliptical cross sections of steel tubular columns with deconstructable splice joint using a finite element modeling software ANSYS and study their structural behavior. This paper includes a parametric study on the effect of axial loading by varying splice length and thickness, bolt diameter and pattern of square and elliptical cross sections of steel tubular columns with deconstructable splice joints. Load v/s deflection curves are obtained which gives the maximum strength and ductility cases. Cyclic load testing is done on square and elliptical cross sections to obtain bending moment rotation curves.
the use of reusable materials in the design stage to create structural components that are simple to assemble and disassemble [11]. At present the research on deconstructable steel structure system is very limited. While closed section column-to-column splicing joints frequently use fully welded connections, which can't satisfy the requirements of convenient disassembly, the majority of the column-tocolumn joints use fully bolted connections [4].The current study proposes square and elliptical cross sections of steel tubular column with conventional high-strength bolts in order to realize deconstructable connection of closed section steel column splicing joints. 3-D finite element model was built using Ansys Workbench 2022 R2 software and further validated against the experiments, which may serve as an important reference for its use in real-world engineering applications. Non-linear analysis is being conducted .In cyclic loading tests, the bending moment rotation curves were obtained. Axial loadings were given to square and elliptical column sections and corresponding ultimate load and deflection curves were plotted.
Key Words:
2. VALIDATION
Local buckling, Splice joint, ANSYS, Deconstructable joints, High strength Bolt
Cyclic loading is being tested for validation. The material properties and dimension for validation is taken from work by [4] as shown in Table 2 and Table 2. Specimen chose for validation were splice connection in square steel tubular column with splice plates being exactly placed at middle position. The square steel tubular column of size 2245mmx220mmx10mm is taken for validation. High strength type of bolt is chosen with nominal diameter M24, 10.9 grade bolt and the total number of bolts is 64. The splice plate of size 785mmx168mmx14mm is used. For cyclic testing bottom is fixed. At the top degrees of freedom in the vertical direction and rotation direction in the bending plane are released. Element type used is SOLID 186(steel plates).Adaptive meshing is used for modeling. Connector elements BEAM 188(Bolt) is used for modeling bolts[11]. Hence bolts are modeled as 1D beam element. Element size is 12mm.Element shape of meshing is HEXAHERDON with higher order element of 20 nodes. Total deformation, equivalent plastic strain and directional deformation is obtained after analysis using ANSYS workbench 2022 R2.
1.INTRODUCTION In addition to the benefits of high construction efficiency, good construction quality, and sustainable development associated with prefabricated steel structures, deconstructable steel structure systems enables quick disassembly and reuse of structural members following the completion of the structure. Deconstructable steel systems therefore have greater promise in the engineering field [4]. Splicing joint is made of lower square steel tubular column, upper column, four numbers of splice plates and number of high strength bolts. Usage of high strength bolt gives higher strength than regular bolts. High strength bolts are made of some alloy steel. These bolts ensures that structure remains safe even under harsh weathers. The splice plates are designed as four numbers of independent plates in order to make sure that the splice plates well fit into the four other component plates of the column. Steel tubular constructions with distinct advantages are being employed more frequently as long span skyscrapers and high-rise buildings continue to
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