#4 20 A 26' 14" 25' 30" Design a rectangular beam ft AB 25 simple span. fé= 3000 psi. fy= This office building has dead load of 94 psf (not including the beam weight). The live load is 50 psf for = 60000 psi, NWC. MIN. Cover = 1.5" #4 Stirrups. an office building.
#4 20 A 26' 14" 25' 30" Design a rectangular beam ft AB 25 simple span. fé= 3000 psi. fy= This office building has dead load of 94 psf (not including the beam weight). The live load is 50 psf for = 60000 psi, NWC. MIN. Cover = 1.5" #4 Stirrups. an office building.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Answer first question please
Transcribed Image Text:**Design a Rectangular Beam**
**Objective**: Design a rectangular beam for the given structural specifications.
**Beam Details**:
- Consider a simple span for beam AB that is 25 feet long.
**Concrete and Steel Specifications**:
- Concrete compressive strength (\( f'c \)): 3000 psi
- Steel yield strength (\( f'y \)): 60,000 psi (normal weight concrete, NWC)
**Building Loads**:
- The office building has a dead load of 94 psf (pounds per square foot), not including the weight of the beam itself.
- The live load is set at 50 psf for office building conditions.
**Beam Cross-Section Design**:
- The beam width is 14 inches, and the beam height is 30 inches.
- Minimum concrete cover: 1.5 inches
- Use #4 stirrups for reinforcement.
**Diagram Explanation**:
*Structural Layout Diagram*:
- The sketch illustrates a structural layout with two spans, where:
- Span sections are labeled as 20 feet and 26 feet across the width, with a 25-foot span for beam AB in focus.
*Cross-Section Diagram*:
- A detailed cross-section of the beam:
- Width: 14 inches
- Height: 30 inches
- #4 reinforcement bars are used with 1.5 inches minimum cover for protective encasing of steel.
**Conclusion**:
This design exercise illustrates how to approach designing a simple rectangular beam for an office building with specific load conditions. Consideration of both dead loads and live loads ensures the beam meets structural safety requirements.
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