Monopole Axial Compression Analysis with and without CFRP

Introduction

Objective of the Study

The primary objective of this study is to analyze the axial compressive behavior of a telecommunication monopole under different loading conditions, with and without the use of Carbon Fiber Reinforced Polymer (CFRP) reinforcement. Monopoles, critical structures used in telecommunication towers, are exposed to significant axial loads. Over time, these loads may lead to deformation, compromising the structural integrity. CFRP reinforcement is included in this analysis to explore how it can reduce displacement and stress, ultimately enhancing the monopole’s performance under compression.

 Scope of the Report

This report compares two monopole models: 1. A **steel-only monopole** sub- jected to axial compression. 2. A **CFRP-wrapped monopole**, which includes CFRP reinforcement around the steel structure.

The study evaluates **stress** and **displacement** for both models using **manual calculations** and **finite element analysis (FEA)** performed with **ABAQUS CAE**. The effectiveness of CFRP in reducing both stress and dis- placement is analyzed and compared across varying applied loads.

Key Points

 **Monopoles** are used in telecommunications to support antennas and other equipment. They are subjected to axial compressive forces, particularly in high- wind or seismic areas. - **CFRP** is used to enhance the strength and perfor- mance of monopoles. It is lightweight, with high strength-to-weight ratio, making it an ideal material to improve monopole performance. 

Methodology

Modeling Approach

The monopole is modeled as a hollow cylindrical structure with the following dimensions:

• **Outer Diameter (D)**: 273 mm
• **Inner Diameter (D)**: 253 mm
• **Thickness (t)**: 10 mm
• **Length (L)**: 900 mm The base plate dimensions are:
• **Base Plate Diameter**: 373 mm
• **Base Plate Thickness**: 20 mm

For the steel material, the following properties are used:

• **Steel Yield Strength ()**: 350 MPa
• **Steel Young’s Modulus (E)**: 200,000 MPa
• **Poisson’s Ratio**: 25

For the **CFRP material**, the properties are:

• **CFRP Thickness**: 5 mm
• **CFRP Modulus**: 640,000 MPa
• **CFRP Tensile Strength**: 2,600 MPa

Boundary Conditions

The **boundary conditions** are as follows: - The **bottom end** is **fixed**, simulating a rigid base. - The **top end** is **free**, allowing the monopole to undergo axial compression.

Finite Element Modeling

The monopole is modeled in **ABAQUS CAE** using **5 mm mesh elements**. The simulation includes **4 bolts** securing the base plate, and **tie constraints** are applied between the steel and CFRP to simulate perfect bonding. The monopole is subjected to incremental loads from **6000 kPa** to **16000 kPa**.

Input Parameters

Finite Element Software Analyzing Method

Software analysis was carried out to guarantee the accuracy of the findings. ABAQUS software was used for the finite element analysis. ABAQUS is also known as CAE (Complete Abaqus Environment), is used to model, analyze and visualize the results of finite element analysis of mechanical assemblies and components.

The Villawood telecommunication monopole was modelled according to a chosen geometric parameter by using ABAQUS software. There are several steps that must be taken to model the structure in ABAQUS. Such as parts, properties, assembly, step, interaction, loads, mesh and job.

Part: As an initial process, the structure was modelled with the length of 900mm, outer diameter 273mm and thickness is 10mm. Similarly, the CFRP wrapping was created with shell element category. Additionally, the partitions were created on the surface to make the complex 3D surface ease for mesh.

Assessment Summary

Objective:
The assessment aimed to analyze the axial compressive behavior of a telecommunication monopole under different loading conditions. The study required comparing:

1. A steel-only monopole subjected to axial compression.

2. A CFRP-reinforced monopole, evaluating the effect of Carbon Fiber Reinforced Polymer (CFRP) wrapping on stress and displacement.

Key Points to be Covered:

• Definition and importance of monopoles in telecommunication infrastructure.
• Material properties of steel and CFRP and their influence on structural behavior.
• Modeling of the monopole, including geometry, boundary conditions, and loading scenarios.
• Use of manual calculations and finite element analysis (FEA) in ABAQUS CAE.
• Comparison of stress, displacement, and overall performance between steel-only and CFRP-wrapped models.
• Evaluation of CFRP effectiveness in enhancing structural performance under axial compression.

Assessment Approach by Academic Mentor

The Academic mentor guided the student through the assessment in a step-by-step process, ensuring clarity, accuracy, and a strong analytical foundation:

1. Understanding the Problem:

   • The mentor began by explaining the importance of axial compressive behavior in monopoles and the potential benefits of CFRP reinforcement.
   • Key learning outcome: Understanding structural performance factors and material enhancements.

2. Geometry and Modeling Setup:

   • The student was instructed to model the monopole as a hollow cylinder with specified dimensions (Outer Diameter: 273 mm, Inner Diameter: 253 mm, Length: 900 mm).
   • CFRP reinforcement modeled as a 5 mm thick shell element around the steel monopole.
   • Base plate and bolt details included to simulate realistic boundary conditions.
   • Learning outcome: Accurate geometric modeling and representation of real-world structures.

3. Material Properties Assignment:

   • Steel: Yield Strength 350 MPa, Young’s Modulus 200,000 MPa, Poisson’s Ratio 0.25.
   • CFRP: Modulus 640,000 MPa, Tensile Strength 2,600 MPa.
   • Learning outcome: Understanding how material properties influence stress and deformation.

4. Boundary Conditions and Load Application:

   • Bottom end fixed, top end free to simulate axial compression.
   • Incremental axial loads applied (6,000 kPa to 16,000 kPa).
   • Learning outcome: Application of realistic structural constraints and load conditions.

5. Finite Element Analysis (FEA) in ABAQUS:

   • The mentor guided the student through ABAQUS modules: Parts → Properties → Assembly → Step → Interaction → Loads → Mesh → Job.
   • Mesh size: 5 mm elements; tie constraints applied between steel and CFRP to simulate bonding.
   • Learning outcome: Hands-on experience with FEA software and simulation setup.

6. Analysis and Comparison:

   • Stress and displacement results compared between steel-only and CFRP-wrapped models.
   • The CFRP-reinforced monopole showed reduced displacement and stress, demonstrating improved performance.
   • Learning outcome: Analytical interpretation of FEA results and material effectiveness.

Outcome Achieved

• Accurate 3D FEA models of both monopoles were developed and analyzed.
• The student successfully compared stress and displacement responses, demonstrating the benefits of CFRP reinforcement.
• Results validated theoretical expectations, showing CFRP’s effectiveness in enhancing monopole performance.

Learning Objectives Covered:

1. Understanding axial compressive behavior of structural elements.
2. Applying material properties to real-world engineering problems.
3. Developing finite element models using ABAQUS CAE.
4. Interpreting simulation results to evaluate structural performance.
5. Enhancing critical thinking and problem-solving skills in structural engineering analysis.

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