Only answer number 4 please ### Reinforced Concrete Column Design#### Diagram Analysis1. **Column Design 1:** - **Diagram:** - A rectangular column cross-section is shown with dimensions 12 inches by 24 inches. - Reinforcement: 4 bars of #8 rebar on the longer side, and #3 stirrups surrounding the rebar. - **Specifications:** - Concrete strength (\(f'_c\)): 5000 psi - Steel yield strength (\(f_y\)): 60 ksi - Type: Normal-weight concrete (NWC) - Cover: 2 inches - Stirrups: #3 - Task: Compute \(\Phi M_n\) (nominal flexural strength).2. **Column Design 2:** - **Diagram:** - Similar rectangular cross-section as Design 1, dimensioned at 12 inches by 28 inches. - Reinforcement: 6 bars of #9 rebar on the longer side, and #4 stirrups around the rebar. - **Specifications:** - Concrete strength (\(f'_c\)): 4000 psi - Steel yield strength: Grade 60 steel - Type: NWC - Cover: 1.5 inches - Stirrups: #4 - Task: Compute \(\Phi M_n\).3. **Column Design 3:** - **Shape Comparison:** - Same shape as Column Design 1. - **Specifications:** - Concrete strength (\(f'_c\)): 3000 psi - Reinforcement: 4 bars of #8 rebar, Grade 60 steel - Type: NWC - Cover: 1.5 inches - Stirrups: #4 - Task: Compute \(\Phi M_n\).4. **Column Design 4:** - **Shape Comparison:** - Same shape as Column Design 2. - **Specifications:** - Concrete strength (\(f'_c\)): 6000 psi - Reinforcement: 6 bars of #9 rebar, Grade 60 steel - Type: NWC - Cover: 2 inches - Stirrups: #3 - Task: Compute \(\Phi M

Breadth of beam=b=12inOverall depth of beam=h=28inmain reinforcement 6 Nos 9 (double layer)shear…

(2) 6#9 12" (4) #4 28" (3) Same shape as (1) fe= 4000 psi. Grade 60 steel Cover = 1.5" #4 stirrups & Mn = ? Same shape as (2) fé= NWC = 3000 psi, NWC 4 #8 Grade 60 steel Cover = 1.5". #4 stirrups. fé= fe= 6000 psi. NWC Grade Go steel. 6 #9. Cover = 2.0" & Mn = ? # 3 stirrops

(2) 6#9 12" (4) #4 28" (3) Same shape as (1) fe= 4000 psi. Grade 60 steel Cover = 1.5" #4 stirrups & Mn = ? Same shape as (2) fé= NWC = 3000 psi, NWC 4 #8 Grade 60 steel Cover = 1.5". #4 stirrups. fé= fe= 6000 psi. NWC Grade Go steel. 6 #9. Cover = 2.0" & Mn = ? # 3 stirrops

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

Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.

Question

Only answer number 4 please

### Reinforced Concrete Column Design

#### Diagram Analysis

1. **Column Design 1:**
- **Diagram:**
- A rectangular column cross-section is shown with dimensions 12 inches by 24 inches.
- Reinforcement: 4 bars of #8 rebar on the longer side, and #3 stirrups surrounding the rebar.
- **Specifications:**
- Concrete strength (\(f'_c\)): 5000 psi
- Steel yield strength (\(f_y\)): 60 ksi
- Type: Normal-weight concrete (NWC)
- Cover: 2 inches
- Stirrups: #3
- Task: Compute \(\Phi M_n\) (nominal flexural strength).

2. **Column Design 2:**
- **Diagram:**
- Similar rectangular cross-section as Design 1, dimensioned at 12 inches by 28 inches.
- Reinforcement: 6 bars of #9 rebar on the longer side, and #4 stirrups around the rebar.
- **Specifications:**
- Concrete strength (\(f'_c\)): 4000 psi
- Steel yield strength: Grade 60 steel
- Type: NWC
- Cover: 1.5 inches
- Stirrups: #4
- Task: Compute \(\Phi M_n\).

3. **Column Design 3:**
- **Shape Comparison:**
- Same shape as Column Design 1.
- **Specifications:**
- Concrete strength (\(f'_c\)): 3000 psi
- Reinforcement: 4 bars of #8 rebar, Grade 60 steel
- Type: NWC
- Cover: 1.5 inches
- Stirrups: #4
- Task: Compute \(\Phi M_n\).

4. **Column Design 4:**
- **Shape Comparison:**
- Same shape as Column Design 2.
- **Specifications:**
- Concrete strength (\(f'_c\)): 6000 psi
- Reinforcement: 6 bars of #9 rebar, Grade 60 steel
- Type: NWC
- Cover: 2 inches
- Stirrups: #3
- Task: Compute \(\Phi M

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