Research on Square and Circular Steel Tubular Columns with Deconstructable Splice Joint Under Cyclic and Axial Testing

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 when failure occurs. These papers focuses on developing models of square and circular cross sections of steel tubular columns with deconstructable splice joint using a finite element 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 circular cross sections of steel tubular columns with deconstructable splice joints. Bending moment rotation curves were obtained from cyclic load testing for square and circular cross sections.

Introduction

I. 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. 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 emerge [12]. Deconstructable structural design also refers to 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-to-column joints use fully bolted connections [4].The current study proposes square and circular 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 software and further validated against the experiments, which may serve as an important reference for its use in real-world engineering applications. In cyclic loading tests, the bending moment rotation curves were obtained. Axial loadings were given to square and circular column sections and corresponding ultimate load and deflection curves were plotted.

II. VALIDATION

The material properties and dimension for validation is taken from work by Fan.et.al (2022) [4] as shown in Table 1 and Table 2.Specimen H1 is chose for validation were splice connection is exactly placed at middle position. The square steel tubular column of size 2245mmx220mmx10mm is taken for validation. The type of bolt is M24 10.9 grade bolt and number of bolt is 64.The splice plate of size 785mmx168mmx14mm is used. Boundary condition adopted is bottom fixed and top cyclic load acting. Element type used is SOLID 186(steel plates).Connector elements used is BEAM 188(Bolt).Minimum element size is 12mm.Element shape of meshing is HEXAHERDON. Total deformation, equivalent plastic strain and directional deformation is obtained after analysis using ANSYS workbench 2022 R2.

Conclusion

1) Finite element analysis is an effective method to study the behavior of the connections. 2) The tubular columns with deconstructable splice connection with maximum load give greater strength. The section with maximum deflection gives greater ductility. 3) 3-D finite element models were developed and tested for cyclic loading for circular cross section which showed maximum moment of 277.67kNm with 3% drift. 4) For square column cyclic loading test almost gave same results obtained from experiment using Specimen H1 with 0.8% error in moment and storey drift of 2.44.Maximum bending moment of 251.77kNm and storey drift of 4.1 was obtained from software. 5) Studied the axial behavior of square and circular steel tubular columns with deconstructable splice joint. Columns showed local buckling in most cases. Square section has maximum load carrying capacity of 3412kN. 6) From the parametric study conducted on square and circular cross section of steel tubular column with deconstructable splice joint, we can conclude that variation of splice and bolt parameters affect the strength, stiffness and ductile characteristics of column section. Going beyond materials ultimate strength can result in failure, such as buckling or excessive deformation.

References

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Copyright

Copyright © 2023 Nehana V.G, Prof. Krishnachandran V. N. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.