A study on seismic response of reinforced structures retrofitted with fluid viscous dampers in shear walls

Table of Contents

1. INTRODUCTION

1.1 General

1.2 Modes of failure of Reinforced concrete shear walls

1.3 Different retrofitting techniques for RC shear walls

1.4 Motivation of study

1.5 Objective of work

1.6 Organization of report

2. LITERATURE REVIEW

2.1 Introduction

2.2 Introduction to the project title

2.3 Literature review

2.4 Summarized outcome of the literature review

2.5 Conclusion

3. METHODOLOGY

3.1 Introduction

3.2 Methodology followed

3.3 Model description

4. RESULT ANALYSIS

4.1 Introduction

4.2 Results and discussions for 9 storey structure with different configuration

4.3 Results for 9, 18 and 27,3d core 27 storey structures

5. CONCLUSION AND FUTURE SCOPE OF WORK

5.1 Brief summary of work

5.2 Conclusion

5.3 Future scope of work

Objectives and Research Focus

The primary objective of this research is to investigate the seismic response of multi-storey reinforced concrete buildings retrofitted with Fluid Viscous Dampers (FVDs) strategically placed within shear wall cut-outs. The work aims to provide a practical design procedure for practicing engineers to effectively mitigate seismic demands.

• Analysis of seismic performance for non-retrofitted versus FVD-retrofitted shear wall structures.
• Evaluation and comparison of different damper configurations (diagonal, chevron, upper and lower toggle).
• Assessment of optimal damper placement within building heights (relative positions) for various structure sizes (9, 18, and 27 storeys).
• Reduction of seismic demand parameters including peak storey displacements, roof accelerations, and pseudo spectral accelerations.

Excerpt from the Book

Summary of Chapters

Chapter 1 INTRODUCTION: This chapter introduces the role of RC shear walls in resisting lateral loads and the necessity for seismic retrofitting, while outlining the research motivation and objectives.

Chapter 2 LITERATURE REVIEW: This chapter reviews previous research on retrofitting techniques and damping devices, establishing the research gap regarding FVD application in shear wall cut-outs.

Chapter 3 METHODOLOGY: This chapter details the modeling process, the time history analysis parameters, and the iterative procedure used to determine the damping coefficients for the FVDs.

Chapter 4 RESULT ANALYSIS: This chapter presents the analytical results of the study, evaluating the impact of different damper configurations and placements on the seismic performance of 9, 18, and 27-storey structures.

Chapter 5 CONCLUSION AND FUTURE SCOPE OF WORK: This chapter summarizes the research findings, confirming the effectiveness of FVDs in reducing seismic demands, and suggests future research directions such as exploring non-linear FVD behavior.

Key Terms

Seismic retrofitting, Reinforced Concrete (RC) shear walls, Fluid Viscous Dampers (FVD), Energy dissipation, Seismic mitigation, Toggle-brace configuration, Time history analysis, SAP2000, Peak storey displacement, Pseudo spectral acceleration, Lateral load resisting system, Structural damping, Dynamic excitation, Seismic performance, Multi-storey buildings.

Frequently Asked Questions

What is the primary focus of this research?

The research focuses on the seismic protection of multi-storey buildings by installing Fluid Viscous Dampers (FVDs) within the cut-out sections of reinforced concrete shear walls.

What are the key themes addressed in this report?

The report covers modes of shear wall failure, various retrofitting techniques (such as concrete replacement and steel bracing), the mechanics of FVDs, and optimal damping configurations.

What is the main objective of the work?

The objective is to study the seismic response of structures retrofitted with FVDs and to determine the most efficient damper configuration and placement to reduce seismic demands like displacement and acceleration.

Which methodology is employed in this study?

The study uses linear time history analysis performed via the SAP2000 software to evaluate the structural behavior under various recorded earthquake ground motions.

What is covered in the main body of the report?

The main body includes a thorough literature review, a detailed explanation of the modeling methodology and damper design procedures, and an extensive analysis of results for various building heights and damper configurations.

Which keywords best characterize this work?

Key terms include Seismic retrofitting, RC shear walls, Fluid Viscous Dampers, energy dissipation, and lateral load resistance.

Why are toggle-brace configurations significant?

The study indicates that toggle-brace configurations are particularly efficient because they yield lower damping coefficient values, which can reduce the overall cost of the retrofitting process.

What role does the "relative position" of dampers play?

The research concludes that placing dampers in lower levels (higher relative position) generally achieves the maximum reduction in peak deflection and peak acceleration for the analyzed structures.