**Problem 7.21** Are the uncoated #8 bars shown anchored sufficiently with their 90° hooks? - \( f'_c = 4000 \, \text{psi} \) - \( f_y = 60 \, \text{ksi} \) The side and top cover is \( 2\frac{1}{2} \, \text{in.} \) on bar extensions. Normal-weight concrete is used. - Required steel area, \( A_s \text{required} = 2.20 \, \text{in.}^2 \). **Answer:** \( \ell_{dh} = 12.4 \, \text{in.} \), sufficient. **Diagram Explanation:** The diagram shows a right-angle hook configuration for the #8 bars. The setup includes: - **3 #8 Bars:** A label indicating three #8 rebar sections in the setup. - **12 in. Clear:** This dimension represents the clear vertical distance between adjacent elements. - **16 in. Clear Horizontal Extension:** Indicates the clear horizontal distance beyond which the bar is extended. - **14 in. Hook Length:** This is the length of the hook at the end of the rebar. - **2 in. Clear:** The clear concrete cover from the inner face of the hook to the outer concrete edge. This setup demonstrates the anchoring situation of the rebar within the concrete structure.

Problem 7.21 Are the uncoated #8 bars shown anchored sufficiently with their 90° hooks? - \( f'_c = 4000 \, \text{psi} \) - \( f_y = 60 \, \text{ksi} \) The side and top cover is \( 2\frac{1}{2} \, \text{in.} \) on bar extensions. Normal-weight concrete is used. - Required steel area, \( A_s \text{required} = 2.20 \, \text{in.}^2 \). Answer: \( \ell_{dh} = 12.4 \, \text{in.} \), sufficient. Diagram Explanation: The diagram shows a right-angle hook configuration for the #8 bars. The setup includes: - 3 #8 Bars: A label indicating three #8 rebar sections in the setup. - 12 in. Clear: This dimension represents the clear vertical distance between adjacent elements. - 16 in. Clear Horizontal Extension: Indicates the clear horizontal distance beyond which the bar is extended. - 14 in. Hook Length: This is the length of the hook at the end of the rebar. - 2 in. Clear: The clear concrete cover from the inner face of the hook to the outer concrete edge. This setup demonstrates the anchoring situation of the rebar within the concrete structure.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Design criteria for structural loading

The different loads such as loads due to self-weight (dead load) and external loads such as live load, wind loads, seismic load, snow load, and other loads and load combinations that influence the design of a building are called structural loading. The nature of the applied load differs from changes in the location, design, and type of materials used. The design criteria require that structures must be designed and constructed to be able to withstand all load types that are expected to act upon the structure and render its usage for the designated purpose. The structural members such as beams, slabs, columns, and foundations help the structure to withstand the applied load. There are different institutes such as ASCE and ACI that provide building design codes to assure minimum safety requirements and quality of the structures.

Question

**Problem 7.21**

Are the uncoated #8 bars shown anchored sufficiently with their 90° hooks?

- \( f'_c = 4000 \, \text{psi} \)
- \( f_y = 60 \, \text{ksi} \)

The side and top cover is \( 2\frac{1}{2} \, \text{in.} \) on bar extensions. Normal-weight concrete is used.

- Required steel area, \( A_s \text{required} = 2.20 \, \text{in.}^2 \).

**Answer:** \( \ell_{dh} = 12.4 \, \text{in.} \), sufficient.

**Diagram Explanation:**

The diagram shows a right-angle hook configuration for the #8 bars. The setup includes:

- **3 #8 Bars:** A label indicating three #8 rebar sections in the setup.
- **12 in. Clear:** This dimension represents the clear vertical distance between adjacent elements.
- **16 in. Clear Horizontal Extension:** Indicates the clear horizontal distance beyond which the bar is extended.
- **14 in. Hook Length:** This is the length of the hook at the end of the rebar.
- **2 in. Clear:** The clear concrete cover from the inner face of the hook to the outer concrete edge.

This setup demonstrates the anchoring situation of the rebar within the concrete structure.

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