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# Reinforced Concrete Beams Analysis

Created by
@ComfortingNiobium

### What is the purpose of STEP 3 in the analysis of T-beams using USD?

• To determine the reduction factor
• To calculate the effective depth
• To check if steel reinforcements yield (correct)
• To determine the moment capacity
• ### What is the value of Φ in the transition region?

• 0.9
• 0.85
• 0.65
• 0.65 + 0.25(1000 - fy) (correct)
• ### What is the effective depth of the beam in the situation described?

• 700 mm
• 750 mm
• 650 mm (correct)
• 300 mm
• ### What is the purpose of STEP 5 in the analysis of T-beams using USD?

<p>To determine the moment capacity</p> Signup and view all the answers

### What is the diameter of the reinforcing bars used in the situation described?

<p>25 mm</p> Signup and view all the answers

### What is the formula derived from the Strain Diagram?

<p>𝜀𝑐 / 𝜀𝑠 = 𝑐 / (𝑑 - 𝑐)</p> Signup and view all the answers

### What is the compressive strength of the concrete used in the situation described?

<p>21 MPa</p> Signup and view all the answers

### What is the yield strength of the reinforcing steel used in the situation described?

<p>350 MPa</p> Signup and view all the answers

### What is the equilibrium equation used to derive the formula from the Stress Diagram?

<p>∑Fx = 0: ↑=↓</p> Signup and view all the answers

### What is the value of fs in terms of f′c?

<p>fs = 0.85f′c</p> Signup and view all the answers

### What is the spacing of the columns on centers in the situation described?

<p>4 m</p> Signup and view all the answers

### What is the relationship between C and T in the Stress Diagram?

<p>C = T</p> Signup and view all the answers

### What is the purpose of the Strain Diagram in reinforced concrete beam design?

<p>To derive the formula for fs</p> Signup and view all the answers

### What is the subject of the provided content?

<p>Analysis of Rectangular Beams (USD)</p> Signup and view all the answers

### What is the value of 𝜙, approximately?

<p>0.8528</p> Signup and view all the answers

### What is the equation to calculate the effective flange width (bf)?

<p>bf = bw + 16tf</p> Signup and view all the answers

### What is the unit of fs, fy, and Mu?

<p>MPa</p> Signup and view all the answers

### What is the purpose of calculating the effective flange width?

<p>To design the reinforced concrete beam</p> Signup and view all the answers

### What is the formula to calculate Mu?

<p>Mu = ϕMn</p> Signup and view all the answers

### What is the range of fs in the given problem?

<p>fy ≤ fs ≤ 1000 MPa</p> Signup and view all the answers

### What is the value of fy in the given problem?

<p>415 MPa</p> Signup and view all the answers

### What is the term for the clear beam length?

<p>Ln</p> Signup and view all the answers

## Study Notes

### Analysis of T-Beams (USD)

• STEP 3: Check if steel reinforcements yield: fs = 600 and φ = 0.65 + 0.25 in the transition region
• STEP 4: Determine the reduction factor: φ = 0.65 + 0.25 if fy &lt; fs &lt; 1000 or εy &lt; εs &lt; 0.005
• STEP 5: Determine the moment capacity: Mu = φ(C or T) d - a/2

### Analysis of Rectangular Beams (USD)

• Derivation of formulas using stress-strain diagram:
• From the strain diagram: (εc / c) = (εs / d-c)
• From the stress diagram: C = T and fs = 600
• Simplified formulas: fs = 600 and φ = 0.8528

### Effective Flange Width (NSCP 2015)

• Formula: bf = bw + 16tf or bf = bw + (s1^2 + s2^2) / 2 or bf = bw + Ln/4
• Where: bw is the base of the web, bf is the base of the flange, tf is the flange thickness, s1 and s2 are the spacings of the beam web, and Ln is the clear beam length

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## Description

This quiz covers the analysis of T-Beams, specifically checking if steel reinforcements yield and calculating the value of φ in the Transition Region.

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