DISCUSSION Design Concepts for Jib Cranes Paper by JAMES FISHER and STEVEN THOMAS (2nd Q. 2002) Discussion by MICHAEL HEMSTAD I thank the authors for a very thorough and informative article on jib cranes. To this‚ I would add the following regarding maximizing the crane’s effect for column design. For a single jib crane on a column‚ the position of the jib crane resulting in the maximum effect on the column can be calculated as follows. The position of the jib crane is described by the angle
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SCHOOL OF CIVIL ENGINEERING ABSTRACT This report describes a compression test on concrete columns. The main aim of the tests was to illustrate the ultimate strength limit state of reinforced concrete columns in combined bending and compression and to demonstrate the influence of slenderness on the ultimate load capacity. Test methods are described. It was found that the concrete columns exhibited complicated behaviour‚ and had a squash load point of 342.7KN and moment at 0 KN
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Using ten pine boards 1.905 cm. by 2.54 cm. leaving 0.3175 cm. gaps between the boards forming a rectangular base held together with 1.27 cm. brad nails installed with a nail gun. Adding 4 boards on the outer perimeter with the nail gun. Forming the edge sides. Using a skill saw cut a 38.1 cm by 25.4 cm. rectangle out of your 0.635 cm. luan board (plywood). Repeat another time so that you have two of these boards. Using a skill saw cut a gable end at a 6-12 pits. Using a square to square the building
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Task 1 Foundry Work Sand casting involves many sequences and there are as follows: - Design and manufacturing the casting. When doing this all vertical edges must be tapered as to make it easier to lift the pattern out of the mould. - Contraction allowances have to be added to the pattern because it shrinks in size in all dimensions. In this case it’s Aluminium‚ which has a contraction allowance of 1.3%. - Machining allowance: Castings are usually machined so that they fit perfectly with
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chord length to simplify the sizing process. Wing structure design requirements‚ No structural failures at design ultimate limit which is 50% more than design limit load. All loading will be added factor of 1.5 to meeting this requirement. No buckling allow at 110% of design limit load. Rib sizing In the wing design‚ the ribs used to support and stiffen the skin to maintain
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Structures‚ 41(2-3)‚ 179-189. 2. Balfour‚ T.A.D (1992)‚ Computer analysis of structural framework‚ Blackwel l‚ Melbourne. 3. Byklum E and Amdahl J.‚ A simplified method for elastic large deflection analysis of plates and stiffened panels due to local buckling. Thin-Walled Structures 40 11 (2002)‚ pp. 923–951. 4. Ben Young and Jintang Yan. (2004)‚ Column Tests of Cold-Formed Steel Channel with Complex Stiffeners‚ ASCE: Journal of Aeronautical Science‚ Vol. 23‚ 1956. 5. British Standard Institution (BSI)
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Frame Buildings with Buckling-Restrained Braces by 1 2 Rafael Sabelli‚ Stephen Mahin and Chunho Chang 3 Abstract This paper highlights research being conducted to identify ground motion and structural characteristics that control the response of concentrically braced frames‚ and to identify improved design procedures and code provisions. The focus of this paper is on the seismic response of three and six story concentrically braced frames utilizing buckling-restrained braces. A
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columns have more load carrying capacity than hollow steel tubular columns due to the interactive effects between steel and concrete; the confining effect of the steel tube on the concrete‚ and the restraining effect of filled-concrete on the local buckling of the steel tube. However‚ only a few frame tests have been done which include Matsui ’s portal frames (1) and CFT threedimensional subassemblages (2) and portal frames (3) tested by first two authors. Test results of portal frames were
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ST03 ST04 ST05 ST06 Assessment • • Attendance: 10% Group Report: 90% (Each Lab Session: 15%). The report will be submitted 1 week after the lab session. Topic Bending Stress in a Beam Steel Bars under Pure Tensile Forces Torsion of Circular Sections Buckling of Struts Continuous and Indeterminate Beams Redundant Truss Please provide the following parts in your report: • Introduction (purpose of the experiment) • Theory • Experimental Results • Analyzing the Experimental Results • Conclusions Group
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Overview 3 Guidelines for Informal Laboratory Report 4 Guidelines for Formal Laboratory Report 6 Basic Laboratory Safety Rules 8 Experiment 1 Tensile Test 9 Experiment 2 Torsion Test 14 Experiment 3 Bending Test 20 Experiment 4 Buckling Test 23 Experiment 5 Hardness Test 34 Experiment 6 Thin Cylinder 41 Experiment 7 Impact Test 55 Experiment 8 Microstructure Analysis 61 Lab Schedule 65 References 2 Laboratory & Reports: An Overview Preparations and procedures
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