This paper presents a study of minimizing weight by optimizing different truss parts using finite element analysis and comparing Warren trusses with other trusses. The aim of the optimization is to find a light design. Existing structural steel trusses were initially optimized for minimum weight and constrained with allowable stresses and deflections. Applicable Eurocode 3 design conditions are presented, which provide the constraints for the problem. Steel truss is a preferred solution in large-span roof structures due to its good attributes, such as being lightweight and durable. Existing structural steel trusses were initially optimized for minimum weight and constrained with allowable stresses and deflections. Constant spans of the trusses have been considered, and each truss has been subjected to the same types of load cases. The top chord member load has been kept constant in each truss at 2 kN/m. Two sets of load conditions are taken as the self-weight of the truss and the snow load, but the structure is calculated by the load combination. The structural steel trusses were optimized using the design optimization tool as a first-order optimization method in RFEM, and it was extended to compare the most suitable truss geometry for the minimum weight. Finally, it is concluded that the Warren truss has a higher stiffness-to-weight ratio than other trusses after optimization. The goal of this study was to analyze all trusses and ensure that the structural stress is less than the allowable stress and that the deflection is less than the allowable deflection. The span and height are constant in all cases because they have no impact on the weight increase; only the position of the rods and cross-section size affect the building’s ability to withstand loads and weight increases. In this paper, a finite element analysis (FEA)-based optimization technique is proposed for the optimization of a light design that is constrained by allowable stresses and deflections. For this purpose, there have been studies on sizing optimization to minimize the mass of different steel truss roof system types both in the past and today. For this purpose, weight design and analysis of the optimum weight are carried out on ten different structural systems.
References
[1]
Templeman, A.B. (1976) A Dual Approach to Optimum Truss Design. JournalofStructuralMechanics, 4, 235-255. https://doi.org/10.1080/03601217608907290
[2]
Azizi, M., Baghalzadeh Shishehgarkhaneh, M. and Basiri, M. (2022) Optimum Design of Truss Structures by Material Generation Algorithm with Discrete Variables. DecisionAnalyticsJournal, 3, Article ID: 100043. https://doi.org/10.1016/j.dajour.2022.100043
[3]
Jalili, S. and Hosseinzadeh, Y. (2015) A Cultural Algorithm for Optimal Design of Truss Structures. LatinAmericanJournalofSolidsandStructures, 12, 1721-1747. https://doi.org/10.1590/1679-78251547
[4]
Yaren Aydoğdu, A., Artar, M. and Ergün, M. (2023) Optimum Weight Design of Steel Truss Roof Systems Considering Corrosion Effect. Structures, 49, 88-105. https://doi.org/10.1016/j.istruc.2023.01.099
[5]
Smith, J., Hodgins, J., Oppenheim, I. and Witkin, A. (2002) Creating Models of Truss Structures with Optimization. ACMTransactionsonGraphics, 21, 295-301. https://doi.org/10.1145/566654.566580
Kaveh, A. and Zolghadr, A. (2013) Topology Optimization of Trusses Considering Static and Dynamic Constraints Using the CSS. AppliedSoftComputing, 13, 2727-2734. https://doi.org/10.1016/j.asoc.2012.11.014
[8]
Webb, D., Alobaidi, W. and Sandgren, E. (2017) Structural Design via Genetic Optimization. ModernMechanicalEngineering, 7, 73-90. https://doi.org/10.4236/mme.2017.73006
[9]
Patrikar, A. and Pathak, K.K. (2016) Fully Stressed Design of Fink Truss Using Staad.pro Software. OpenJournalofCivilEngineering, 6, 631-642. https://doi.org/10.4236/ojce.2016.64051
[10]
Gaur, H., Murari, K. and Acharya, B. (2016) Optimization of Sectional Dimensions of I-Section Flange Beams and Recommendations for IS 808: 1989. OpenJournalofCivilEngineering, 6, 295-313. https://doi.org/10.4236/ojce.2016.62025
[11]
Salt, S.J., Weldeyesus, A.G., Gilbert, M. and Gondzio, J. (2022) Layout Optimization of Pin-Jointed Truss Structures with Minimum Frequency Constraints. EngineeringOptimization, 55, 1403-1421. https://doi.org/10.1080/0305215x.2022.2086539
[12]
Hai-Wen, H.L.T. (2010) Factors of statically Indeterminate Truss to Achieve Full Stress. Building Technique Development, No. 7, 16-18.
[13]
Ahrari, A. and Atai, A.A. (2013) Fully Stressed Design Evolution Strategy for Shape and Size Optimization of Truss Structures. Computers&Structures, 123, 58-67. https://doi.org/10.1016/j.compstruc.2013.04.013
[14]
Hultman (2010) Weight Optimization of Steel Trusses by a Genetic Algorithm Size, Shape and Topology Optimization According to Eurocode. Department of Structural Engineering Lund Institute of Technology. http://lup.lub.lu.se/student-papers/record/3358937
[15]
Norkus, A. and Karkauskas, R. (2004) Truss Optimization under Complex Constraints and Random Loading. JournalofCivilEngineeringandManagement, 10, 217-226. https://doi.org/10.1080/13923730.2004.9636309
[16]
Fiore, A., Marano, G.C., Greco, R. and Mastromarino, E. (2016) Structural Optimization of Hollow-Section Steel Trusses by Differential Evolution Algorithm. InternationalJournalofSteelStructures, 16, 411-423. https://doi.org/10.1007/s13296-016-6013-1
[17]
Mercader Ardevol, A. (2019) Optimization of Steel Frames Using Two-Phase Approach. Master’s Thesis, Tampere University Civil Engineering. https://urn.fi/URN:NBN:fi:tty-201905061518
[18]
Helminen, M. (2017) Optimization of a Trussed Steel Portal Frame. Master’s Thesis, Tampere University of Technology. https://urn.fi/URN:NBN:fi:tty-201711202181
[19]
Ketola, T. (2019) Algorithm-Aided Design and Optimization of Steel Truss. Master’s Thesis, Tampere University. https://urn.fi/URN:NBN:fi:tty-201903201317
