Consider the following statements regarding the design of T-beams : 1. To establish flange thickness hf based on flexural requirements of the slab, which normally spans transversely between perpendicular T beams. 2. Determine the effective flange width bf according to ACI limits. 3. Choose web dimensions bw and d based on either negative bending requirements at the supports or shear requirements by setting a reasonable upper limit on the nominal unit shear stress Vu in the beam web. Which of the above statements are correct ?
- A1 and 2 only
- B2 and 3 only
- C1 and 3 only
- D1, 2 and 3Correct
Solution
Concept
Design procedure for T-beams
Step-by-step solution
1. The flange thickness is set by the slab design (statement 1). 2. The effective flange width is found from code limits (statement 2). 3. The web size is chosen from negative moment or shear requirements (statement 3).
Explanation
These are the successive steps in proportioning a T-beam.
Why the other options are wrong
Each of the other options omits a valid step.
Shortcut
T-beam: flange thickness, flange width, web size.
Correct answer: D) 1, 2 and 3