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Structural Loads Part 2 Civil Engineering and Architecture

Structural Loads Part 2 Civil Engineering and Architecture. Unit 6 Structures. In this lesson:. Solve the Building Design Problem “Chase” the Load Calculate Beam and Girder Loading Select the Beam and Girder Size Size the footings. Building Design Problem.

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Structural Loads Part 2 Civil Engineering and Architecture

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  1. Structural Loads Part 2 Civil Engineering and Architecture Unit 6 Structures

  2. In this lesson: • Solve the Building Design Problem • “Chase” the Load • Calculate Beam and Girder Loading • Select the Beam and Girder Size • Size the footings

  3. Building Design Problem • A Steel Framed Retail Building with Concrete Floors and Flat Roof Please click here to obtain Revit file of the building.

  4. Girder Beam Column Footing Second Floor Framing

  5. Design Steps

  6. Load Chasing for this Problem • Calculate beam loading, obtain reactions • Transfer reaction loads to girder • Carry girder reactions to column then to footing

  7. Foundation Plan

  8. Design Area Partial 2nd Floor Framing Plan

  9. 6’8” Width Tributary or Contributing Area Beam B.3 Column B-3 Girder 3BC

  10. Calculating Beam Loading Please click here to obtain “Steps for Calculating Beam Loading.”

  11. Dead and Live Load Documents Click Here for the Live Load Sheet Click Here for the Dead Load Sheet

  12. 2nd Floor Beam, Girder Calculations 2nd Floor Loading for Beam B.3 - Dead Load • Span Length 18’-0” • Dead Load • 4” thick concrete slab 50 lb/ft2 • Flooring- Ceramic Tile 10 lb/ft2 • Partitions (Drywall with metal stud) 8 lb/ft2 • Suspended Ceiling 2 lb/ft2 • Mechanical/ Electrical Items 10 lb/ft2 • Total DL 80 lb/ft2 • Assumed Dead Load Weight of Beam: 20 lb/ft

  13. 2nd Floor Beam, Girder Calculations 2nd Floor Loading for Beam B.3 - Live Load • Live Load • Retail Space 80 lb/ft2 • Total Load DL + LL (per lineal foot of beam) • [80lb/ft2 + 80 lb/ft2 ] x 6.67 ft = 1067.2 lb/ft • Add the Beam Weight of 20 lb/ft • Total DL + LL + Beam Weight = 1087.2 lb/ft • Use 1090 lb/ft

  14. 2nd Floor Beam B.3 Calculations MD Solids Span Length is 18 feet. Uniform Load w = 1090 lb/ft

  15. Shear Moment 2nd Floor Beam B.3 Calculations MD Solids – Shear and Moment Diagrams

  16. Fb = (Yield Strength) (36,000 psi) = 24,000 psi Fb = (50,000 psi) = 33,000 psi Fb = Allowable Bending Stress Allowable Bending Stress = Fb • A36 Structural Steel – 36,000 psi

  17. = Fb = 24,000 psi = Section Modulus M = 44,145 ft-lbs SRequired = 22.073 in3

  18. MDSolids Design Results B.3

  19. Design Results for B.3- con.

  20. Deflection limited to: 216 in 0.6 in = 360 Beam B.3 Deflection Professional Development Lesson ID Code: 8009

  21. Beam B.3 Comparisons SELECT

  22. Girder 3BC Calculations Beam B.3 Span Length is 18 feet. Uniform Load = 1090 lb/ft P1 = P2 = (18ft)(1090 lb/ft) P1 = P2 = 19,620 lb.

  23. Girder 3BC Moment and Shear

  24. = Deflection Limit = Design Results Deflection Limit = 0.666”

  25. Footing Calculations

  26. Footing Loads • Allowable Soil Bearing Capacity = 3000 lb/ft2 • Loads Considered • Dead & Live load from 2nd floor and roof • Column’s weight (dead load) • Load from 1st floor slab • Dead load from footing

  27. Roof Load Roof Type: Corrugated Steel Deck with insulation and 5 ply membrane roof and gravel, located in Rochester NY. • Dead Load • Suspended Ceiling 2 lb/ft2 • Mechanical Equipment 10 lb/ft2 • Steel Deck 5 lb/ft2 • Insulation 2 lb/ft2 • Roof Membrane and Gravel 6 lb/ft2 • Roof Framing 10 lb/ft2 • Total DL 35 lb/ft2

  28. Roof Load – Snow • Snow Load • Rochester, NY 55 lb/ft2 • Total Load on Roof • DL + SL = 35 lb/ft2 + 55 lb/ft2 = 90 lb/ft2 • Axial Load on Column B-3 from Roof • Tributary Area of Roof = 18 ft x 20 ft = 360 ft2 • (DL + SL)(Trib. Area) = (90 lb/ft2)(360 ft2) = 32,400 lb

  29. Roof Loads Column B-3 2nd Floor Loads 1st Floor/ Slab Loads Soil Bearing Reaction Loads on Column and Footing

  30. Loads on Column - Footing • Loads on the Column • 2nd Floor • Girder x 2 = 2(20,120 lb) = 40,240 lb • Beams x 2 = 2(9,810 lb) = 19,620 lb • Roof • Concentrated Load = 32,400 lb • Column Self Weight • 21 ft x 50 lb/ft (estimated) = 1,050 lb • Total 93,310 lb • Use 94,000 lbs

  31. Soil Bearing Capacity Available • Soil Capacity Available=3000 lb/ft2 - 150lb/ft2 = 2850 lb/ft2 = qnet Allowable Soil Bearing Capacity= 3000 lb/ft2 Footing wt. = (1 ft)(150 lb/ft3) = 150 lb/ft2

  32. Sizing the Footing • Load Column Footing = 94,000 lbs Soil Capacity Available = 2850 lb/ft2 = qnet Use 6’-0” x 6’-0” Square Footing

  33. The Solutions: • Beam B.3 W12x22 • Girder B3B W16x45 • Footing under Column B-3 6’ x 6’

  34. Curriculum Alignment: Unit 6 – Structural Engineering Lesson 6.1 – Introduction to Structural Engineering Act. 1.1 – Structural Calculations Act. 1.2 – More Load Calculations Lesson 6.2 – Roof Systems Lesson 6.3 – Columns and Beams

  35. References: Jefferis, A. & Madsen, D.A. (2001). Architectural Drafting and Design, Albany, NY: Delmar Kane, K. & Onouye B., (2002). Statics and Strength of Materials for Architecture and Building Construction, 2nd ed., Saddle River, NJ: Pearson Education, Inc Shaeffer, R.E. (2002). Elementary Structures for Architects and Builders, 4th ed.. Columbus, OH: Prentice Hall Manual of Steel Construction, 8th ed., American Institute of Steel Construction http://pbs.org/wgbh/buildingbig/lab/forces.html

  36. Credits: Writer: Constance Bertucci Content Editor: Donna E. Scribner Narration: Donna E. Scribner PLTW Editor: Ed Hughes Production: CJ Amarosa Video Production: CJ Amarosa Audio: CJ Amarosa Project Manager: Donna E. Scribner

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