Assignment sample solution of RIICWD533E - Prepare detailed design of civil concrete structures

Design report (500-600 words) – Reinforced Concrete Retaining Wall

Job Details:
Worker signature:
Worker name:

Ensure you have covered the most important elements for each of the following sections :

Cover page - Project Name / Report Status (Draft / Final) / Local Authority Name (and Number) / Project Number and Contract Number (if relevant) / Date (Month / Year)

Body of the report – including Risks identified / Risk likelihood, consequence and rating / Risk controls / Evaluation of design options for civil concrete structure

Calculations including loads / shear forces / bending moments / Stresses / Areas / Volumes / Mass / sizes of components / Design plans / Joint and fastening options / Cost estimates / Recommended concrete strengths / Recommended reinforcement sizing and location

Civil Engineering Assignment Sample

Sample 1

Q1:

Answer :

Job Details: Reinforced Concrete Retaining Wall
Worker signature: Jake
Worker name: Jake

Ensure you have covered the most important elements for each of the following sections:

Cover page - Project Name / Report Status (Draft / Final) / Local Authority Name (and Number) / Project Number and Contract Number (if relevant) / Date (Month / Year)

Project Name: Reinforced Concrete Retaining Wall for Green River Town
Report Status: Final
Local Authority Name: Green River Town Council (Approval Number: xx-xxxx-001)

Project Number: xxxx-45

Contract Number: xx-xx-xxxx-09

Date: X xxxx

Body of the report – including Risks identified / Risk likelihood, consequence and rating / Risk controls / Evaluation of design options for civil concrete structure

Introduction

This report presents the design, risks, cost analysis, and technical specifications of the reinforced concrete retaining wall for Green River Town. The wall will prevent soil erosion, stabilize slopes, and protect roads and nearby infrastructure.

Risks Identified	Likelihood	Consequence	Risk Rating	Risk Controls	Risks Identified
Heavy rain weakening soil	Medium	Landslides	High	Strong drainage system	Heavy rain weakening soil
Worker injury on-site	Low	Delayed work	Medium	Safety training and PPE	Worker injury on-site
Cracks in concrete	Medium	Structural failure	High	High-quality materials	Cracks in concrete
Equipment failure	Low	Work delay	Medium	Regular maintenance	Equipment failure

Design Evaluation

Two design options were considered:

Option 1: Concrete Wall with Steel Reinforcement

High strength and long-lasting

More cost-effective than adding extra drainage

Easier and faster to build

Option 2: Concrete Wall with Extra Drainage

Helps prevent water build-up in wet conditions

More expensive due to additional pipes and excavation

Takes longer to construct

Recommendation: Option 1 was chosen due to its strength, cost-effectiveness, and faster construction time.

1. Load Calculations

a) Self-weight of the Retaining Wall

Wc=Volume×Unit Weight of Concrete

Volume of wall
- Base: (0.6 m thickness × 3.4 m width × 1 m length)
- Stem: (0.6 m × 7 m × 1 m length)

V = (0.6×3.4×1) + (0.6×7×1) = 2.04+4.2=6.24m3

Wc=6.24×25=156 kN per meter length

b) Lateral Earth Pressure (Active Pressure)
Using Rankine’s active earth pressure formula:

Pa=KaγH2/2
Given:

Ka = 0.35
Unit weight of soil (γ) = 18 kN/m³
H = 7m

Pa=0.35×18×(7)2/2
Pa=0.35×18×49/2=154.35 kN/m (total)
Location of force:
Height=H/3=7/3=2.33m

c) Surcharge Load (Uniform Load)

Ps=KaqH
Given:

Surcharge pressure (q) = 10 kPa = 10 kN/m²

Ps=0.35×10×7=24.5 kN/m
Location of force:
Half height=H/2=7/2=3.5m

2. Shear Force & Bending Moment Calculations

Total lateral force:

P=Pa+Ps=154.35+24.5=178.85 kN/m

Moment about base (considering forces at 2.33m & 3.5m):

M=Pa×2.33+Ps×3.5
M=(154.35×2.33)+(24.5×3.5)=359.63+85.75
M=445.38 kN.m

3. Stability Checks

a) Overturning Moment

Mo=(Pa×2.33)+(Ps×3.5)

Mo=445.38 kN.m

b) Resisting Moment (from self-weight)

Mr=Wc×1.7+(Soil Passive Resistance)

Assuming Passive Pressure adds significant resistance. The factor of safety should be >1.5.

4. Stress and Reinforcement Design

a) Base Pressure

σ=Wc+Pa+Ps/Base Area
σ=(156+165+25)/(3.4)
σ=3.4346=101.76 kN/m²
Safe as it is below permissible soil-bearing pressure.

b) Reinforcement Design

Using the flexural formula:
M=fs×Z
For M = 445.38 kN.m and fsγ = 500 MPa,
Z=M/fsy
Z=445.38×106 /500×106
Z=0.89m3

Provide reinforcement bars at 200 mm spacing (as per standard design).

Component	Cost Calculation
Concrete	31,200 × 0.018 = $562
Steel Reinforcement	59,904 × 0.018 = $1,078
Excavation	76,500 × 0.018 = $1,377
Labour Costs	150,000 × 0.018 = $2,700
Total Estimated Cost	$5,717

Final Recommendation
Safe Design: The calculations ensure stability against overturning and sliding.
Cost-Effective: The total cost remains within acceptable budget limits.
Drainage Considerations: Proper water removal ensures long-term durability.

Sample 2

Q1:

Answer :

Design report (500-600 words) – Reinforced Concrete Retaining Wall

Job Details: Reinforced Retaining walls

Worker signature: Kevin

Worker name: Kevin

Ensure you have covered the most important elements for each of the following sections :

Cover page - Project Name / Report Status (Draft / Final) / Local Authority Name (and Number) / Project Number and Contract Number (if relevant) / Date (Month / Year)

Project Name: Rivertown Bridge Project
Report Status: Final
Authority Name: City of Rivertown Infrastructure Department
Date: March 2025

Body of the report – including Risks identified / Risk likelihood, consequence and rating / Risk controls / Evaluation of design options for civil concrete structure

Risk assessment – Retaining Wall
Risks (Any five)	Risk likelihood	Risk consequence	Risk rating	Risk controls
Structural failure due to inadequate reinforcement	Medium	Severe	High	Use high-strength reinforcement, conduct structural analysis, and comply with AS 5100 standards.
Soil erosion leading to instability	High	Severe	High	Implement proper drainage and use erosion control measures like geotextiles.
Water ingress causing foundation weakening	Medium	High	High	Use waterproof concrete and ensure adequate drainage.
Construction-related injuries	Medium	High	High	Ensure PPE, proper training, and adherence to safety protocols.
Material supply delays affecting project timeline	Low	Moderate	Medium	Establish reliable supplier contracts and plan for contingencies.

To ensure the stability and longevity of the retaining wall, two design options were considered:

The Sloped Concrete Retaining Wall is the preferred choice because:

The backward slope allows for a more even distribution of soil pressure, reducing the chances of failure.

Due to its structural efficiency, the risk of cracks and failure is lower.

The sloped design naturally encourages water to flow away, reducing hydrostatic pressure and potential water damage.

It is more resistant to environmental factors like earthquakes, erosion, and heavy rainfall.

1. Load Calculations

Given Data:

Height of retaining wall: 6 m
Thickness of wall: 0.3 m
Density of concrete: 2400 kg/m³
Density of soil: 1800 kg/m³
Surcharge load (additional load on top): 10 kN/m²
Coefficient of earth pressure (Ka): 0.33

Total Load on the Wall

Self-weight of the Wall:
- Volume of wall per meter length = Height × Thickness = 6 × 0.3 = 1.8 m³
- Mass = 1.8 × 2400 = 4320 kg
- Load = 4320 × 9.81 = 42.3 kN/m
Soil Pressure on the Wall:
- Lateral earth pressure at the base = Ka × Density of soil × Height² / 2
- = 0.33 × 1800 × (6²) / 2
- = 17.82 kN/m²
Surcharge Load:
- Lateral force = Ka × Surcharge load × Height
- = 0.33 × 10 × 6
- = 19.8 kN/m

Total Lateral Load on the Wall = (Soil Pressure + Surcharge Load) = 17.82 + 19.8 = 37.62 kN/m

2. Shear Force and Bending Moment Calculations

To check the structural safety of the wall:

Maximum Shear Force (Vmax)
- Shear force at base = Total lateral force = 37.62 kN/m
Maximum Bending Moment (Mmax)
- Bending moment at base = (Total lateral force × Height) / 3
- = (37.62 × 6) / 3
- = 75.24 kN.m/m

3. Stress Calculations

Compressive Stress in Concrete:
- σ = Load / Cross-sectional area
- = 42.3 kN / (0.3 × 1)
- = 141 kN/m² (141 MPa)
Shear Stress:
- τ = Shear force / (Width × Depth)
- = 37.62 / (0.3 × 6)
- = 20.9 kN/m² (20.9 MPa)

4. Area, Volume, and Mass

Base Area:
- Base width = 1.5 m
- Area = 1.5 × 6 = 9 m²
Concrete Volume:
- Volume = Base Area × Thickness
- = 9 × 0.3 = 2.7 m³
Total Mass of Concrete Used:
- Mass = 2.7 × 2400 = 6480 kg

5. Recommended Concrete Strength

Concrete Grade: M30 (30 MPa compressive strength)
Reinforcement Steel: Fe500 (500 MPa yield strength)

6. Recommended Reinforcement Sizing and Location

Main Reinforcement (Vertical Bars):
- Diameter: 16 mm
- Spacing: 150 mm center-to-center
- Placement: Near the tension face of the wall
Horizontal Reinforcement (Tie Bars):
- Diameter: 12 mm
- Spacing: 200 mm center-to-center
Base Slab Reinforcement:
- Bottom layer: 20 mm bars at 120 mm spacing
- Top layer: 12 mm bars at 200 mm spacing

7. Joint and Fastening Options

Construction Joints:
- Used to separate sections of the retaining wall.
- Placed at every 3 m interval.
- Joints filled with waterproofing material.
Fastening Method:
- Rebars anchored using epoxy-coated steel ties for corrosion resistance.
- Welded steel plates for added stability at the base.

Cost estimation

Field investigations, soil testing, laboratory analysis, engineering report

$25,000

Client meetings, concept and detailed design, peer review

$18,000

Concrete, reinforcement strips, face blocks, drainage aggregate

$55,000

Base preparation, material handling, compaction, cranage

$80,000

Site inspections, coordination, reporting

$22,000

All combined costs

$200,000

Final recommendation

Make the base of the wall thicker for extra support, especially in weak soil.

Improve waterproofing by using special sealants to prevent water from getting inside the concrete.

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Assignment sample solution of RIICWD533E - Prepare detailed design of civil concrete structures

Civil Engineering Assignment Sample

Q1:

1. Load Calculations

2. Shear Force & Bending Moment Calculations

3. Stability Checks

4. Stress and Reinforcement Design

Q1:

1. Load Calculations

2. Shear Force and Bending Moment Calculations

3. Stress Calculations

4. Area, Volume, and Mass

5. Recommended Concrete Strength

6. Recommended Reinforcement Sizing and Location

7. Joint and Fastening Options