Steel Design (Activate Learning with these NEW titles from Engineering!)
6th Edition
ISBN: 9781337094740
Author: Segui, William T.
Publisher: Cengage Learning
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Question
Chapter 2, Problem 2.5P
To determine
(a)
The maximum factored load and the controlling AISC load combination by using the load and resistance factor design.
To determine
(b)
The maximum load and the controlling AISC load combination by using allowed strength design (ASD).
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A flat roof is subject to the following uniformly distributed loads: a dead load of 21 psf (pounds per square foot of roof surface), a roof live load of 12 psf, a snow load of 13.5 psf, and a wind load of 22 psf upward. (Although the wind itself is in a horizontal direction, the force that it exerts on this roof is upward. It will be upward regardless of wind direction. The dead, live, and snow loads are gravity loads and act downward.)
a. If load and resistance factor design is used, compute the factored load (required strength) in pounds per square foot. Which AISC load combination controls?
b. If allowable strength design is used, compute the required load capacity (required strength) in pounds per square foot. Which AISC load combination controls?
A flat roof is subject to the following uniformly distributed loads: a dead load of 21 psf (pounds per square foot of roof surface), a roof live load of 12 psf, a snow load of 13.5 psf, and a wind load of 22 psf upward. (Although the wind itself is in a horizontal direction, the force that it exerts on this roof is upward. It will be upward regardless of wind direction. The dead, live, and snow loads are gravity loads and act downward.). If load and resistance factor design is used, compute the factored load (required strength) in pounds per square foot. Which AISC load combination controls?
There are 5 load combinations below:
Combination 1: 1.4DCombination 2: 1.2D+1.6L+0.5(Lr or S or R)Combination 3: 1.2D+1.6(Lr or S or R) +(0.5L or 0.5W)Combination 4: 1.2D+1.0W+0.5(Lr or S or R)Combination 5: 0.9D+1.0W
How to deal with the wind load? If the wind load W=-22 psf, then the result of combination 5 will be -3.1 psf, which is negative. And the tensile strength of materials and…
A closed storage building is located on open flat terrain in central Ohio. If the sidewall of the building is 20 ft high, determine the external wind pressure acting on the windward and leeward walls. Each wall is 60 ft long. Assume the roof is essentially flat.
Chapter 2 Solutions
Steel Design (Activate Learning with these NEW titles from Engineering!)
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- The school building has a flat roof. It is located in an open area where the ground snow load is 0.98 kN/m2. Determine the snow load that is required to design the roof.arrow_forwardA hospital located in central Illinois has a flat room. Determine the snow load in kN/m^2 that is required to design the roof.arrow_forwardThe interior wall of a building is made from 2 x 4 wood studs, plastered on two sides. If the wall is 12 ft high, determine the load in lb/ft of length of wall that it exerts on the floor. Check the minimum design dead load table for the unit weight.arrow_forward
- Compute the maximum combined loads using the recommended ASDexpressions from the AISC. D = 10,000 lb,W = ;32,000 lbarrow_forwardWind blows on the side of a fully enclosed 30-ft-high hospital located on open flat terrain in Arizona. Determine the design wind pressure acting over the windward wall of the building at the heights 0–15 ft, 20 ft, and 30 ft. The roof is flat. Take Ke = 1.0.arrow_forwardan urban hospital located in central illinois has a flat roof. determine the snow load in KN/m2 that is required to design the roofarrow_forward
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