1. Given the following information, determine the appropriate LRFD load combination and calculate the load acting on a typical roof joist (plf). The joists span 30 ft and are spaced 5 ft on center. Select the lightest K-series joist from the LRFD joist selection tables. Since this is for a roof joist, allowable deflection is L/240. In addition to the series designation, also indicate the capacity of the joists. Dead Load: 28 psf Roof Live Load: 20 psf Snow Load: 31 psf Rain Load: 23 psf Wind Load: 33 psf (Upward)
1. Given the following information, determine the appropriate LRFD load combination and calculate the load acting on a typical roof joist (plf). The joists span 30 ft and are spaced 5 ft on center. Select the lightest K-series joist from the LRFD joist selection tables. Since this is for a roof joist, allowable deflection is L/240. In addition to the series designation, also indicate the capacity of the joists. Dead Load: 28 psf Roof Live Load: 20 psf Snow Load: 31 psf Rain Load: 23 psf Wind Load: 33 psf (Upward)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Certainly! Here's a transcription of the given information in an educational context:
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**Problem Statement:**
1. **Objective:** Calculate the appropriate LRFD (Load and Resistance Factor Design) load combination to ascertain the load acting on a typical roof joist, expressed in pounds per linear foot (plf). Select the lightest K-series joist from the LRFD joist selection tables based on the following parameters.
2. **Specifications and Requirements:**
- **Joist Span:** 30 feet
- **Spacing:** 5 feet on center
- **Allowable Deflection:** L/240 (where L is the span length)
3. **Load Information:**
- **Dead Load:** 28 pounds per square foot (psf)
- **Roof Live Load:** 20 psf
- **Snow Load:** 31 psf
- **Rain Load:** 23 psf
- **Wind Load:** 33 psf (applied upward)
4. **Tasks:**
- Determine the appropriate LRFD load combination.
- Select the lightest K-series joist that satisfies the given conditions.
- Indicate both the series designation and the capacity of the selected joists.
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This structured information is intended to assist in the understanding of load calculations and selection criteria for roof joists in engineering and architectural applications.
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