Architectural Drafting and Design (MindTap Course List)
Architectural Drafting and Design (MindTap Course List)
7th Edition
ISBN: 9781285165738
Author: Alan Jefferis, David A. Madsen, David P. Madsen
Publisher: Cengage Learning
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Chapter 27, Problem 27.1Q
To determine

The major components of platform framing and its advantages.

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Platforming framing is defined as the type of framing which is used in construction for the creation of a platform for framings.

The major components of platform framing are given below.

  1. Rafter − It is the inclined member in the structure which supports the load from roofs
  2. Ceiling joists − It is a horizontal member that provides resistance to the spreading of the rafters in an outward direction.
  3. Footing −It is the foundation provided for platform framing.
  4. Floor joist − It is a structural member which is repetitively used for supporting the subfloor.
  5. Studs − It is the vertical member of the wall generally of size 2×4 or 2×6 .
  6. Roof sheathing − It is the components that are used for covering the member of the structure.

The advantages of platform framing are given below.

  1. It eliminates the requirement of fire blocks.
  2. It can be used as a platform that helps in joining walls at the platform level.

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5. (20 Points) Consider a channel width change in the same 7-foot wide rectangular in Problem 4. The horizontal channel narrows as depicted below. The flow rate is 90 cfs, and the energy loss (headloss) through the transition is 0.05 feet. The water depth at the entrance to the transition is initially 4'. 1 b₁ TOTAL ENERGY LINE V² 129 У1 I b₂ TOP VIEW 2 PROFILE VIEW h₁ = 0.05 EGL Y₂ = ? a) b) c) 2 Determine the width, b₂ that will cause a choke at location 2. Determine the water depth at the downstream end of the channel transition (y₂) section if b₂ = 5 feet. Calculate the change in water level after the transition. Plot the specific energy diagram showing all key points. Provide printout in homework. d) What will occur if b₂ = = 1.5 ft.?
4. (20 Points) A transition section has been proposed to raise the bed level a height Dz in a 7-foot wide rectangular channel. The design flow rate in the channel is 90 cfs, and the energy loss (headloss) through the transition is 0.05 feet. The water depth at the entrance to the transition section is initially 4 feet. b₁ = b = b2 1 TOTAL ENERGY LINE V² 129 Ут TOP VIEW 2 hloss = 0.05 " EGL Y₂ = ? PROFILE VIEW a) Determine the minimum bed level rise, Dz, which will choke the flow. b) If the step height, Dz = 1 ft, determine the water depth (y2) at the downstream end of the channel transition section. Calculate the amount the water level drops or rises over the step. c) Plot the specific energy diagram showing all key points. Provide printout in Bework. d) What will occur if Dz = 3.0 ft.?. Crest Front View
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