Analysis and optimum design of metal structures. (2020)

• Record Type: Book
• Further Information: Note: J. Farkas, K. Jármai.
• Authors: Farkas, J; Jármai, Károly
• Contents: ABOUT THE AUTHORS -- LIST OF SYMBOLS -- INTRODUCTION -- Part 1: Analysis -- 1 RESIDUAL WELDING STRESSES AND DISTORTIONS -- 1.1 Simple examples of thermoelasticity -- 1.2 The Okerblom's analysis -- 1.3 Multi-pass welding -- 1.4 Effect of initial strains -- 1.5 The effect of external loading on the welding residual stresses -- 1.6 Reduction of residual stresses -- 1.7 Numerical examples -- 1.7.1 Suitable welding sequence in the case of a welded asymmetric I-beam -- 1.7.2 Welding in a clamping device -- 1.7.3 Welding in prebent state in a clamping device -- 1.8 Weld improvement methods -- 1.8.1 Weld geometry modification methods -- 1.8.2 Residual stress methods -- 2 THIN-WALLED RODS -- 2.1 Introduction -- 2.2 Bending and shear, shear center -- 2.3 Torsion -- 2.3.1 Saint Venant torsion -- 2.3.2 Warping torsion -- 3 STABILITY -- 3.1 Introduction -- 3.2 Classes of cross-sections -- 3.3 Compression members -- 3.3.1 Flexural buckling -- 3.3.2 Flexural-torsional buckling -- 3.4 Lateral-torsional buckling of beams loaded in bending -- 3.5 Beam-columns -- 3.6 Plate buckling -- 3.6.1 Classic results for plate buckling -- 3.6.2 Post-buckling behaviour of compressed plates -- 3.6.3 Limiting plate slendernesses -- 4 VIBRATION AND DAMPING, SANDWICH STRUCTURES -- 4.1 Measures of damping -- 4.2 Relations between the measures of damping -- 4.3 Classification of damping -- 4.4 Material damping -- 4.4.1 Characterization of viscoelastic materials -- 4.5 Material property measurements -- 4.6 Material damping in structures -- 4.7 Nonmaterial damping -- 4.8 Damping of welded structures -- 4.9 Sandwich structures -- 4.9.1 Vibrations of three-layered damped beam structures -- 4.9.2 Static behaviour -- 4.9.3 Dynamic behaviour -- 4.9.4 Measurements on an experimental sandwich beam -- 5 FABRICATION COSTS -- 5.1 Introduction -- 5.2 Fabrication times for welding -- 5.2.1 Formula proposed by Pahl & Beelich -- 5.2.2 The method based on COSTCOMP data -- 5.3 Surface preparation time -- 5.4 Painting time -- 5.5 Cutting and edge grinding times -- Part 2: Optimum design -- 6 MATHEMATICAL METHODS FOR STRUCTURAL SYNTHESIS -- 6.1 Historical background -- 6.2 Design variables, objective functions, constraints and preassigned parameters -- 6.2.1 Design variables and preassigned parameters -- 6.2.2 Constraints -- 6.2.3 Objective function -- 6.3 Divisions in optimization techniques -- 6.4 Methods without derivatives -- 6.4.1 Complex method -- 6.4.2 Flexible tolerance method -- 6.4.3 Hillclimb method -- 6.5 Methods with first derivatives -- 6.5.1 Penalty methods: SUMT, exterior, interior penalties -- 6.5.2 Davidon-Fletcher-Powell method -- 6.6 Methods with second derivatives -- 6.6.1 Newton's method -- 6.6.2 Sequential quadratic programming -- 6.7 Optimality criteria methods -- 6.8 Discrete optimization techniques -- 6.8.1 Backtrack method -- 6.8.2 Discretization after continuous optimization -- 6.9 Sensitivity analysis -- 6.10 Approximation techniques -- 6.11 Multiobjecti ve optimization -- 6.12 Description of the methods of multiobjective optimization -- 6.12.1 Method of objective weighting -- 6.12.2 Method of distance functions -- 6.12.3 Min-max method -- 6.12.4 Constrained method -- 6.12.5 Hybrid methods -- 6.12.6 Selection of the 'best' solution -- 7 EXPERT SYSTEMS -- 7.1 Artificial intelligence -- 7.2 Expert systems -- 7.3 Comparison of conventional programs and expert systems -- 7.4 Architecture of an expert system -- 7.5 Advantages of expert systems -- 7.6 Capabilities of expert systems -- 7.7 Inference engine -- 7.8 Steps for the development of expert systems -- 7.9 Knowledge representation -- 7.9.1 Semantic networks, object orientated systems -- 7.9.2 Object-attribute-value triplets -- 7.9.3 Production rules -- 7.9.4 Frames -- 7.9.5 Certainty factors -- 7.10 Knowledge acquisition -- 7.11 Expert system shells and ES-s for structural design -- 7.12 Overview on Personal Consultant -- 7.13 Overview of Level 5 Object -- 7.14 Application of an es for the optimum design of the main girders of overhead travelling cranes -- 7.14.1 Objective functions -- 7.14.2 Design constraints -- 7.14.3 Main data of an example solved by Personal Consultant -- 8 STATICALLY DETERMINATE BEAMS SUBJECTED TO BENDING AND SHEAR -- 8.1 Optimum design neglecting shear -- 8.1.1 Analytical method -- 8.1.2 Graphoanalytical method -- 8.1.3 Some comparisons -- 8.1.4 Effect of painting costs -- 8.2 Optimum design considering shear -- 8.3 Multicriteria optimization of a welded box beam -- 9 TUBULAR MEMBERS -- 9.1 Compression -- 9.1.l Centrally compressed steel struts -- 9.1.2 Unsafe design using the Euler buckling curve -- 9.1.3 Absorbed energy of CHS and SHS braces cyclically loaded in tension-compression -- 9.1.4 Optimum design and imperfection-sensitivity of centrally compressed SHS and CHS aluminium struts -- 9.1.5 Tubular columns prestressed by tension ties -- 9.2 Bending of CHS beams -- 9.2.1 Elastic range -- 9.2.2 Plastic range -- 10 STEEL AND ALUMINIUM STRUCTURAL COMPONENTS WITH FATIGUE CONSTRAINTS FOR WELDED JOINTS -- 10.1 Factors influencing the fatigue of welded joints -- 10.2 Fatigue design rules of the Eurocode 3 -- 10.3 Compression square hollow section strut connected to gusset plates -- 10.3.1 Steel structure -- 10.3.2 Aluminium structure -- 10.4 Compression rod of circular hollow section with a welded splice -- 10.4.1 Steel structure -- 10.4.2 Aluminium structure -- 10.5 Welded I-section cantilever connected to a column by fillet welds -- 10.5.1 Steel structure -- 10.5.2 Aluminium structure -- 10.6 Welded box beams -- 10.6.1 Steel structure -- 10.6.2 Aluminium structure -- 10.6.3 Numerical example -- 11 TUBULAR TRUSSES -- 11.1 Effect of cross-sectional shape on the optimum geometry of truss structures -- 11.2 A tubular truss of parallel chords -- 11.3 A truss with non-parallel chords -- 12 STIFFENED AND CELLULAR PLATES -- 12.1 Main characteristics of stiffened and cellular plates -- 12.2 Optimum design of a cellular plate of square symmetry by simplified hand calculation -- 12.3 Cost comparisons of stiffened and cellular plates -- 12.3.1 Introduction -- 12.3.2 A brief literature survey -- 12.3.3 Minimum cost design of a square cellular plate -- 12.3.4 Minimum cost design of a square stiffened plate -- 12.3.5 Numerical example for both structural versions -- 12.4 Effect of fabrication cost on the optimum dimensions of a stiffened Plate -- 12.5 Minimum cost design of rectangular cellular plates -- 12.5.1 The cost function -- 12.5.2 The design constraints -- 12.5.3 The optimization procedure -- 12.5.4 Numerical examples -- 12.5.5 Conclusions -- 13 WELDED STEEL BRIDGES -- 13.1 Survey of selected literature -- 13.2 Main tubular truss girder of a belt-conveyor bridge -- 13 .3 Minimum cost design of Vierendeel SHS trusses -- 13.3.1 Introduction -- 13.3.2 The cost function -- 13.3.3 Design constraints -- 13.3.4 An illustrative numerical example -- 13.3.5 Conclusions -- 14 WELDED STEEL SILOS -- 14.1 Introduction -- 14.2 Design and cost calculation of structural parts -- 14.2.1 Roof -- 14.2.2 Bin -- 14.2.3 Hopper -- 14.2.4 Columns -- 14.2.5 Ringbeam -- 14.3 Numerical example -- 14.4 Consideration of earthquake load -- 14.5 Conclusions -- APPENDICES -- Appendix A -- Appendix B -- Appendix C -- REFERENCES & BIBLIOGRAPHY -- NAME INDEX -- SUBJECT INDEX.
• Edition: 1st
• Publisher Details: Boca Raton : CRC Press
• Publication Date: 2020
• Extent: 1 online resource
• Subjects: 624.182; Building, Iron and steel; Structural analysis (Engineering); Structural optimization
• Languages: English
• ISBNs: 9781000150612
• Related ISBNs: 9781000099935; 9781000121650; 9781003077947
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