Gantry Girder Design.pptx
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This document discusses the design of gantry girders for cranes. It begins with classifications of cranes based on their duty cycle. It then lists the typical parts of an overhead crane and considerations for loading, including vertical and horizontal loads. Guidelines are provided for selecting a gantry girder profile, including span to depth ratio. Structural stability factors like girder section properties, column arrangement, bracing, and crane stops are covered. Finally, the document discusses load combinations, design calculations according to code, and some additional design considerations.
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Design of Gantry Girders (1).pptx
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Similar to Gantry Girder Design.pptx
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The document presents a comparative study of different gantry girder profiles for various crane capacities and gantry spans. Bending moments, shear forces, and section properties are calculated and tabulated for 'I'-section with top and bottom plates, symmetrical plate girder, 'I'-section with 'C'-section top flange, plate girder with rolled 'C'-section top flange, and unsymmetrical plate girder sections. Graphs of steel weight required per meter length are presented. The 'I'-section with 'C'-section top flange profile is found to be optimized for biaxial bending but rolled sections may not be available for all spans.
Design of Gantry Girders (1).pptx
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D03405029037
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hello folks;
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This report is authorized by the team member's name mentioned on Slide.
Thank you!!
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- 1. CONSULTING ENGINEERS LIMITED Gantry Girder By Sandeep Jagtap
- 2. CONSULTING ENGINEERS LIMITED Crane Classification Classification as per Crane Manufacturers Association of America (CMAA) 1. Class A1 ( Standby Service ) 2. Class A2 ( Infrequent Use ) 3. Class B ( Light Service ) 4. Class C ( Moderate service) 5. Class D ( Heavy Duty) 6. Class E ( Severe Duty Cycle Service) 7. Class F ( Steel Mill)
- 3. CONSULTING ENGINEERS LIMITED Various Parts of Crane 1. Wheel Carriage 2. Crane Girder 3. Trolley or Crab 4. Hook 5. Crane Wheels 6. Gantry Girder 7. Crane Stops
- 4. CONSULTING ENGINEERS LIMITED Loading Considerations 1. Vertical Loads a. Weight of Crane Frame b. Weight of Trolley or Crab c. Hook Load d. Impact Load 2. Horizontal Loads a. Lateral (Surge) Load = = (Hook Load + Trolley Weight) x µ x (No. of breaking wheels / No. of wheels) = 10/100 (Hook Load + Trolley Weight) ……For EOT Crane = 5/100 (Hook Load + Trolley Weight) ……..For Hand Operated Crane b. Longitudinal (Drag/Tractive) Load = = 5/100 (Hook Load + Trolley Weight)
- 5. CONSULTING ENGINEERS LIMITED Selection Of Gantry Girder Points to be checked : 1. Generally, Single-span gantry girders are desirable. 2. Abrupt changes in c/s should be avoided & proper camber should also be provided. 3. Cantilever gantry girders should be avoided. 4. Deflection should be limited to as per Table-6 of IS:800-2007 5. Rail eccentricity over the gantry girder should be avoided as far as possible. 6. Stiffeners should be welded to underside of the top flange & down web. 7. To resist lateral loading, the strength of the top flange alone should be considered. 8. Generally, continuous welds shall be provided for connecting additional members to the rolled beams used as gantry girders considering fatigue factor. 9. For economic design, depth of gantry girder should be about 1/12th of the span & that width of flange should be 1/40th to 1/30th of the span.
- 6. CONSULTING ENGINEERS LIMITED Typical gantry girder profiles Typical column profiles to support gantry girder Orientation of columns supporting heavy cranes
- 8. CONSULTING ENGINEERS LIMITED Structural Stability Considerations 1. Girder Section Properties -Web of section -Top flange -Bottom flange 2. Columns -Arrangement/system of columns for load transfer from crane to base. - Orientation of columns 3. Bracings -Sections to be used : Mostly double angles -Location of bracings -Bracings system 4. Crane Stops Crane stops are used to prevent the crane moving past the end of a runway, thereby preventing the crane from falling off. -Energy absorbing fixtures shall be used. -Expansion gap of 25 mm is kept in a continuous rail at every 30m length.
- 10. CONSULTING ENGINEERS LIMITED Load Combinations For SERVICEABILITY a. DL + LL + EQPL b. DL + LL + EQPL ± WL c. DL + LL + EQPL ± 0.8EL For DESIGN a. 1.5DL + 1.5LL + 1.5EQPL b. 1.2DL + 1.2LL + 1.2EQPL ± 1.2WL c. 1.2DL + 1.2LL + 1.2EQPL ± 1.2EL d. 0.9DL ± 1.5EL
- 11. CONSULTING ENGINEERS LIMITED Design Of Gantry Girder (IS 800 : 2007) 1. Calculating max. Wheel Load from analysis data. 2. Calculating max. BM = (Due to Self Weight of Crane ) + (Due to max. Wheel Load with Impact) = 2Wc (L/2-c/4)2 / L 1. Calculating max. Shear Force = WL (2-c/L) : Clause 8.4 2. Selection of Girder Section 3. Calculating combined section properties & finding class of section 4. Calculating moment capacity of section 5. Check for Buckling Resistance, Shear, Bi-axial Bending & Deflection : Section-8, 9 6. Check for fatigue resistance : Section-13
- 12. CONSULTING ENGINEERS LIMITED Design Of Gantry Girder (Some design considerations) 1. If factored design force exceeds 0.6 times design shear strength of girder, then moment due to lateral torsional buckling will come into picture & design moment capacity should be worked out w.r.t. clause 9.2 2. Shear lag effect in flanges may be disregarded as per clause 8.2.1.5 3. Effective length for lateral torsional restraint provided as intermediate lateral restraints, shall be taken as 1.2 times length between lateral restraints. Otherwise, when beam is continuously restraint for full length, effective length shall be taken in accordance with the Table-15. 4. Resistance to shear buckling shall also be verified as per clause 8.4.2