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IRJET- Numerical Investigation on Cold Formed Press Braking Steel Zed Sections under Axial Compression
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IRJET- Numerical Investigation on Cold Formed Press Braking Steel Zed Sections under Axial Compression
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3409 NUMERICAL INVESTIGATION ON COLD FORMED PRESS BRAKING STEEL ZED SECTIONS UNDER AXIAL COMPRESSION K. Vivek(1), M. Yuvraj(2), S. Revathi(2), R. Vijay Krishna(2), S. Santhosh(2) 1Assistant Professor, Department of Civil Engineering, Paavai Engineering College 2Under Graduate Students, Department of Civil Engineering, Paavai Engineering College, Tamilnadu, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - This paper describes a buckling behavior of a series of innovative cold form press braking steel column sections .Buckling behavior was analyzed by both theoretical and Numerical analysis. For the optimization process of arbitrarily shaped thin walled member is done by CUFSM4.03 package. The steel channel and zed sections were considered with various profile and the dimensions were comprisesasper the guidelines given in North American Specification (NAS). The parametric study was also carried outbyvaryingtheyield stresses and keeping the, thickness andlengthofthecolumnas constant. The sections were made with cold formed steel sheets of thickness 2mm and 600mm in length. The yield stresses of steel sheets were varied as 250N/mm2, 350N/mm2 and 550N/mm2 which are obtained from preliminary coupon test results. Theoretical analysis was done by Direct Strength Method, which was proposed by B.W.Schafter in 2004[9]. Numerical analysis is done by finite element modelling package ANSYS 12.1 with non-linear analysisoncolumns. This paper describes the failure modes of buckling in Cold Formed Steel sections and nominal load carried by the column under axial compression. Keywords: Cold formed steel, Zed/Zee Section, FEM, DSM, Buckling Mode. 1. INTRODUCTION Cold formed steel (CFS) is the common term for products made by rolling or pressing steel semi-finished or finished goods at relatively low temperatures (cold working). Cold- formed steel goods are created by the working of steel billet, bar, or sheet using stamping, rolling(including roll forming), or presses to deform it into a usable product. Cold-worked steel products, such as cold-rolled steel (CRS) bar stock and sheet, are commonly used in all areas of manufacturing of durable goods, such as appliances or automobiles, but the phrase cold-formed steel is most prevalently used to describe construction materials.Intheconstructionindustry both structural and non-structural elements are created from thin gauges of sheet steel. These building materials encompass columns,beams, joists,studs,floordecking,built- up sections and other components. The strengthofelements used for design is usually governed by buckling. The construction practices are more similar to timber framing using screws to assemble stud frames. A main property of steel, which is used to describe its behaviour, is the stress–strain graph. The stress–strain graphs of cold-formed steel sheet mainly fall into two categories. They are sharp yieldingandgradual yieldingtype illustrated below in Figure 1 and Figure 2, respectively.1.1 Figure -1 Sharp Yielding type Figure -2 Gradual Yielding Type 1.1 Review Literature A literature review or narrative review is a type of review article. A literature review is a scholarly paper, which includes the current knowledge including substantive findings, as well as theoretical and methodological contributions to a particular topic. Some of the literature reviews for our cold formed steel members are as follows, André Dias Martins, et al (2017) proposed a topic on ‘The direct strength design of cold-formedsteel columnsfailing in local- distortional interactivemodes.’Theydiscuss proposals for the codification of efficient design approaches for cold- formed steel columns affected by local-distortional (L-D) interaction. R.S. Glauz (2017) proposed on topic ‘Flexural-torsional buckling of general cold-formed steel columns with unequal unbraced lengths’. The design of cold-formed steel columns
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3410 must consider flexural buckling, torsional buckling, and flexural- torsional buckling. Tekcham Gishan Singh, et al (2017) explains the main concept of Structural performance of YSt–310 cold–formed tubular steel stub columns. A comprehensive experimental and numerical programme to investigate material characteristics and stub column member capacities of YSt 310 cold–formed SHS and RHS was conducted. Helder D. Craveiro, et al (2016) did anExperimental analysis of built up closed cold formed steel columns with restrained thermal elongation under fire conditions. The investigation is that the interaction between the initial applied load and imposed level of restraint to thermal elongation may significantly influence the overall behaviour of cold formed steel columns under fire conditions. Yan Lu, et al (2017) determines the Novel local buckling formulae for cold-formedC-sectioncolumnsconsideringend condition effect. They derived a novel local bucklingformula for cold-formed C-section column, which takes both the effects of cross-section plate element interactions and end conditions into account. Jia-Hui Zhang, et al (2015) proposed the Numerical investigation and design of cold-formed steel built-up open section columns with longitudinal stiffeners. Itrecommends that the built-up open section columns with longitudinal stiffeners can be used as a prequalified section for column design in the current DSM. C. Jiang et al (1998) investigated the Design of Thin-Walled Purlins for Distortional Buckling. It offersaccurateapproach to cladding restraint problems that can change the conventional lateral-torsional buckling mode of failure into one of distortional buckling which increases the stability of the purlin. 1.2 Scope of study The scope of the study is to check for the effective performance of cold formed steel column sectionsthatcarry ultimate load with low buckling failure values and failure mode is predicted by carrying out various methods of analysis. CUFSM 4.03 (ConstrainedandUnconstrained Finite Strip Method) is used to calculate the buckling stress and buckling mode of arbitrarily shaped thin walled members. Numerical analysis is done by finite element modelling package ANSYS 12.1 (Analysis of Systems) with non-linear analysis on columns. Among the various sections with constant length and thicknessandvaryingyieldstrength, the section and check which section profile that gives satisfactory results and showing effectiveperformanceisthe efficient design approach of the columns. This is major parameter that the project concentrates by carrying out experiments and to compare the test results under compression. 2 PARAMETRIC STUDIES By keeping the length and thickness of the members as constant, the yield strength of the members get varied. From the above mentioned property of materials, varying cross sectional profile of Zed sections was derived. Z1 – Plain Lipped Zed Section Z2 – Plain lip stiffened Zed Section Z3 – Plain lip stiffened Zed Section by inclined members Z4 – Flange stiffened Zed Section Z5 – Flange and Web stiffened Zed Section Figure -3 Cross sectional Profile of Specimen Table -1: Parametric Study Specifications Data Specifications Data Length 600mm Poison’s ratio 0.3 Thickness 2mm Yield stress 250N/mm² 350N/mm² 550N/mm² Depth 160mm Web stiffener angle 300 Width 65mm Flange stiffener angle 450 Young’s modulus 2.03 x 105 N/mm² Lip depth 30mm 2.1 Optimization of section The column properties that fall within the geometrical limitation from DSM specifications of cold formed steel design as follows. Table -2 Section Optimization Parameter Observed result Status 76< h/t < 137 80 Satisfied 30< b/t < 56 32.5 Satisfied 0< d/t < 36 15 Satisfied 1.5 < h/b < 2.7 2.46 Satisfied
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3411 0 < d/b < 0.73 0.464 Satisfied 0 deg 450 & 300 Satisfied 2.2 Theoretical Investigation The methods used for the computation of buckling load and load factors are presented below. 2.2.1 Direct-Strength Method Direct Strength, has been created that aims to alleviate the current complexity, ease calculation, and provide a more robust and flexible design procedure, and integrate with available, established, numerical methods." Use of the Direct Strength Method requires (1) Determination of the elastic buckling behaviour of the member and (2) Using that information in a series of ultimate strength curves to predict the strength. Design Equations: 1. Local buckling load: 2. Distortional buckling load: 2.2.2 Indian Standard Method India Specification: IS: 801,Indianstandardcodesofpractice for use of cold-formed light gauge steel structural members in general building construction,BureauofIndianStandards, New Delhi (1975). (Currently underrevision)BuildingCode: see - model code National Building Code of India. Design equations: Basic design stress = Fb = 0.6Fy (W/t) lim = (1435/ ) (W/t) lim < (W/t) (b/t) = x Q = Cc = ) KL/r = slenderness ratio KL/r < Cc Fal = – x (KL/r)² Allowable load = Fal x area 2.2.3 Effective Width Method Effective Width Method, for determining the nominal distortional buckling strength of typical cold-formed steel sections subjected to bending. 2.2.4 Allowable Strength Design In this approach, the forces (bending moments, axial forces, shear forces) in structural members are computed by accepted methods of structural analysis for the specified working loads. These member forcesor momentsshouldnot exceed the allowable values permitted by the applicable design specification. The allowable stress design method employs only one factor of safety for a limit state. 2.2.5 AISI Method AISI’s codes and standards work is conducted under the Construction Market Council of the Steel Market Development Institute (SMDI), a business unitofAISI,which oversees the industry’s investment in advancing the competitive use of steel by meeting the demands of the marketplace. 2.3 CUFSM 4.01 The finite strip method is a technique of structural analysis used for bridge and tall structure design as well and in the design of construction components such as steel beams.The technique was first introduced in 1968 by B.W.Schafer and made this software package as open source software for the researchers and is less powerful and versatile than the finite element method but is more efficient in terms of computation power in some situations. Table-3 (a) Section Properties Section Area (Inch2) Ixx (Inch4) Izz (Inch4) Z1-250-600 1.0602 6.5369 1.9071 Z1-350-600 1.0602 6.5369 1.9071 Z1-550-600 1.0602 6.5369 1.9071 Z2-250-600 1.2338 7.2372 2.544 Z2-350-600 1.2338 7.2372 2.544 Z2-550-600 1.2338 7.2372 2.544 Z3-250-600 1.0675 6.7393 2.3931 Z3-350-600 1.0675 6.7393 2.3931
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3412 Z3-550-600 1.0675 6.7393 2.3931 Z4-250-600 1.1729 6.6224 1.0541 Z4-350-600 1.1729 6.6224 1.0541 Z4-550-600 1.1729 6.6224 1.0541 Z5-250-600 1.2264 6.9171 1.0571 Z5-350-600 1.2264 6.9171 1.0571 Z5-550-600 1.2264 6.9171 1.0571 The section properties obtained from the CuFSM 4.01 package which will be useful fortheoretical calculations,was mentioned in Table 3. The Graph represented in Figure 4 which shows the various buckling modes of failure regions (Local buckling, Distortional buckling and Flexural or Global buckling) and also the load factor values for various column lengths. From the obtained results, it shows that the short columns subjected to crushing and the slender columns subjected to flexural buckling. Table-3 (b) Section Properties Section Xcg Zcg Local Distortion Z1-250-600 -0.000018 3.1103 1.2935 2.3752 Z1-350-600 -0.000018 3.1103 0.9240 1.6967 Z1-550-600 -0.000018 3.1103 0.5879 1.0796 Z2-250-600 0 3.1103 1.3453 3.4968 Z2-350-600 0 3.1103 0.9610 2.4979 Z2-550-600 0 3.1103 0.6115 1.5895 Z3-250-600 0 3.1103 1.2869 1.5543 Z3-350-600 0 3.1103 0.9193 1.1103 Z3-550-600 0 3.1103 0.5849 0.7065 Z4-250-600 1.2401 3.1103 3.6563 1.9319 Z4-350-600 1.2401 3.1103 2.6119 1.38 Z4-550-600 1.2401 3.1103 1.662 0.87814 Z5-250-600 1.2402 3.1103 4.5457 1.9417 Z5-350-600 1.2402 3.1103 3.2472 1.387 Figure -4 Buckling curve 2.4 Numerical Investigation Numerical investigation on cold formed press braking steel zed members are done by finite element method technique which is commercially available in the name as ANSYS 12.0. ANSYS is numerical method for solving problems of engineering and mathematical physics. Typical problems areas of interest include structural analysis, heat transfer, fluid flow, Mass transport,andelectromagneticpotential.The analytical solution of these problems generally require the solution to boundary value problem for partial differential equation the finite element method formulation of the problem results in a system of algebraic equation. 2.4.1 Type of Element In this study, there are two types of Elements were used in finite element package of ANSYS 12.0 are, (1) 4 node 181 Shell elements, (2) Structural Mass 21 element. Shell 181 element is used for cold formed steel sections where as they are having 3 Translational and 3 Rotational degree of freedom. Mass 21 element is used forthecreationofCGnode where the axial load is applied. Typical DOF of Shell and Mass elements are shown in Figure 5 and Figure 6. The model creation through these elements was shown in Figure 7. Figure -5 Shell 181 Elements Figure -6 Structural Mass 21 Elements 2.4.2 Types of mesh There are two types of meshing pattern adopted in ANSYS package. The meshing can be done either by free mesh
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3413 Figure -7 Element Creation or mapped mesh which is shown in Figure 8. In this study, the elements size after meshing is kept constant as 20mm and Mapped meshing pattern is adopted throughout the project. Figure -8 Free and Mapped Mesh 2.4.3 Boundary Condition The fixed end condition in cold formed steel sections were given in software package as input parameters by arresting the displacement and rotational degrees at bottom, and except displacement degrees in axial direction, remaining are arrested. Boundary conditions adopted in thisstudywas mentioned in Table 4. The generated model in ANSYS 12.0 after meshing was shown in Figure 9. Table -4 Boundary Conditions Boundary condition Element Constraints Fixed end support Top face UX, UZ, rotx roty rotz Bottom face UX, Uy UZ, rotx roty rotz These analyses can easily be inappropriate. Care should be taken to specify appropriate model andsolutionparameters. Understanding the problem, the role played by these parameters and a planned andlogical approachwill domuch to ensure successful solution. Material nonlinearityinvolves the nonlinear behavior of a material based on a current deformation, deformation history, rate of deformation, temperature, pressure, and so on. Examples of nonlinear material models are large strain(visco)elastic-plasticityand hyper elasticity (rubber and plastic materials). Figure -9 Model Generation 2.4.4 Nonlinear Analysis A nonlinear analysis is an analysis where a nonlinear relation holds between applied forces and displacements. Nonlinear effects can originate from geometrical nonlinearity’s (i.e. large deformations), material nonlinearity’s (i.e. elasto-plastic material), and contact. These effects result in a stiffness matrix which is not constant during the load application. This is opposed to the linear static analysis, where the stiffness matrix remained constant. As a result, a different solving strategy is required for the nonlinear analysis and therefore a different solver. After nonlinear analysis of Cold formed steel Zed column sections, the various buckling modes of failure were described in Figure 10. 3. RESULTS AND DISCUSSIONS The obtained results for allowable buckling load from theoretical analysis (DirectStrengthMethod)andNumerical Investigation (ANSYS12.0) are mentionedinTable5. Typical buckling modes observed in the numerical analysis were shown in Figure 10. The load vs deflection curve obtained in ANSYS are mentioned in Figure 11. The comparison of results shows that the numerical and theoretical result matches closes to each other. Table -5 Comparison of Theoretical and Numerical Results Section ID Theoretical Analysis (DSM) Numerical Results (FEA) PFEA / PTheoritical. Z1-250 153.476 154 1.00 Z1-350 190.429 197 1.03 Z1-550 251.238 249 0.99 Z2-250 181.793 184 1.01 Z2-350 226.107 231 1.02 Z2-550 299.614 303 1.01 Z3-250 151.262 151 1.00 Z3-350 188.342 192 1.02
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3414 Z3-550 245.102 254 1.04 Z4-250 176.611 171 0.97 Z4-350 223.858 228 1.02 Z4-550 295.948 295 1.00 Z5-250 184.896 181 0.98 Z5-350 234.469 236 1.01 Z5-550 310.107 318 1.03 Mean 1.01 Figure 10 Typical Failure modes of Buckling Figure -11 Load vs Deflection Curve Figure -12 Comparisons of Theoretical and Numerical Results 4. CONCLUSIONS Based on the investigations made on the fixed ended cold formed press braking steel zed columnmembersunderaxial compression, the following are the conclusions were made. Results of theoretical andnumerical analysisarecloserto each other. The increase in yield strength of steel sections will results in increase in allowable buckling load on the columns. The sections provided with stiffeners are failed due to distortional buckling whereas the plain zed sections are failed due to local buckling. For the given height, occurrence of global buckling is not possible. Ultimate load carrying capacity is inversely proportional to slenderness ratio (L/r ratio). REFERENCES [1] North American Specification for the Design of Cold- Formed Steel Structural Members, 2016 Edition. American Iron and Steel Institute, Washington, DC; 2016. [2] Yan Lu, et al (2017) Novel local buckling formulae for cold-formed C-section columns considering end condition effects Thin walled structures, volume 116, July 2017, pages 265 - 276 [3] Jia-Hui Zhang, et al (2015)the Numerical investigation and design of cold-formed steel built-up open section columns with longitudinal stiffeners Thin walled structures, volume 89, April 2015, pages 178 - 191 [4] Tekcham Gishan Singh, et al (2017) Structural performance of YSt–310 cold–formed tubular steel stub columns Thin walled structures, volume 121,December 2017, pages 25 - 40 [5] Helder D. Craveiro, et al (2016)Experimental analysisof built up closed cold formed steel columns with restrained thermal elongation under fire conditions. Thin walled structures, volume 107, October 2016, pages 564 - 579 [6] ANSYS analysis user manual – ANSYS Version 12.0. [7] R.S. Glauz (2017) ‘Flexural-torsional bucklingofgeneral cold-formed steel columns with unequal unbraced lengths’ Thin walled structures, volume 119, October 2017, pages 946 - 955. [8] André Dias Martins, et al (2017) ‘The direct strength design of cold-formed steel columns failing in local- distortional interactive modes.’ Thin walled structures Vol. 120, November 2017 pages 432- 445. [9] B.W.Schafter in 2004, Theoretical analysis was done by Direct Strength Method, which was proposed, Vol. 128, page 737 – 745. [10] C. Jiang et al (1997) Design of Thin-Walled Purlins for Distortional Buckling, Thin walled structures Vol. 120, December 1997 pages 189-202.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3415 BIOGRAPHIES Vivek. K is a Post graduate degree holder in Structural Engineering and working as an Assistant Professor in the Department of Civil Engineering, Namakkal for the past six years. Got university ranking in both UG and PG, and possess good knowledge in the field of structural engineering. Publishes many papers in various International journals and conferences. I am M. Yuvraj doing my final year UG Civil Engineering degree in Paavai Engineering college. I am well verse in software like Autocad, Revit, ETABS. Also a project done by me on Environmental Engineering was selected in MSME Taiwan, Japan I am S.Revathi doing my final year UG Civil Engineering degree in Paavai Engineering college. I have possess good knowledge on drafting and designing of structures. I am R.Vijay Krishna doing myfinal year UG Civil Engineering degree in Paavai Engineering college. I Completed Master Diploma course in Civil Engineering. I am S.Santhosh doing my final year UG Civil Engineering degree in Paavai Engineering college. I am well verse in various Software applications related to the field of Civil Engineering. 2nd Author Photo 4th Author Photo 3rd Author Photo 1’st Author Photo
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