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PROGRESS REPORT FOR EXTRUDED PRODUCTS DIVISION May 17, 2001 Yongwook Kim, PhD Student Teoman Pekz, Professor

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Objective Develop reliable methods and Specifications for efficient and optimum design of extruded and rolled aluminum members Scope Extruded and rolled aluminum sections that are either not covered or covered inadequately in the AA Specifications. Types of Members Columns, beams and beam columns

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AA Specification Actual Shape INACCURATE MODELING OF EXTRUSIONS BY THE AA SPECIFICATION

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hinge

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SOME EXTRUSIONS CANNOT BE DESIGNED ACCORDING TO THE AA SPECIFICATION

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INTEGRATED NUMERICAL METHODS AND DESIGN PROVISIONS FOR ALUMINUM STRUCTURES thin beams columns thick beams simplecomplicatedthick & thinthin Year 1Year 2Year 3 Year 1 Year 2Year 3 additional 6 month lateral buckling modified plan original plan Spec recommendations

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DOE AA FUNDING: DOE $399,225 AA $120,000 (The AA contribution enabled us to get the DOE funding) INTEGRATED NUMERICAL METHODS AND DESIGN PROVISIONS FOR ALUMINUM STRUCTURES

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What Have We Found So Far ? AA Specification Does Not Consider Load Carrying Capacity Accurately Possible Design Approaches Developed by FEM Simulations for Sections of Fig. 1 FEM Simulations Are Proved by Physical Tests Fig. 1

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What Have We Found So Far ? Current AA Specification Does Not Provisions Sections with Tapered Flanges (Fig. 2) Actual Behavior of Tapered Sections Are Simulated by FEM (Fig. 2) Fig. 2

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Beam Capacity Comparison [ Fig.1 Section ] AA Standard I-Beam:I-3x1.64 (6063-T6) EC9 : Eurocode 9 TESTS : 3 Bending Tests FEM : Simulations Using Finite Element Method

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Beam Capacity Comparison [ Fig.1 Section ] AA Standard I-Beam:I-3x1.64 (6061-T6) EC9 : Eurocode 9 APP1 ~4 : Possible Design Approaches 1~4 FEM : Simulations Using Finite Element Method

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Tests vs. Simulation [Fig.1 Section] Tests Simulation

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FEM Simulation [Fig.2 Section]

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Aluminum Design Workshops Objective Informal exchange of ideas between the US and foreign researchers Held in 1998, 2000 and to be held in 2001

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WORKSHOP 2 PARTICIPANTS

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CORNELL RESEARCHERS WHO HELPED WITH WORKSHOP 2

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A graduate student has completed a Master of Science thesis on the subject. He is now working on his PhD Thesis on the subject. Several papers have been prepared. Eight progress reports have been prepared and these reports are being reviewed by the AA Engineering Task Group. OTHER ACTIVITIES

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ACKNOWLEDGEMENT The sponsorship of the Extruded Products Division, the Aluminum Association and the DOE is gratefully acknowledged.