Assessment of R. C. Flat Slab Building

Table of Contents

Chapter-1

INTRODUCTION

1. General

1.1 Objective of Study

1.2 Organization of the dissertation

Chapter-2

LITERATURE REVIEW

Chapter-3

MODELLING OF FLAT SLAB BUILDINGS

3.1.General

3.2 Types of flat slab

3.3 Different components of flat slab

3.3.1 Use of column head

3.3.2 Use of drop panel

3.4 Advantages of flat slab

3.4.1 Flexibility in room Layout

3.4.2 Prefabricated welded mesh

3.4.3 Buildable scores

3.5 Behavior of flat slab building during earthquake

3.6 Modeling of flat slab

3.6.1 Finite element approach

3.6.2 Equivalent frame method

3.6.3 Modified equivalent frame method

3.6.4 Extended beam- width procedure

3.6.5 Extended equivalent column method

3.6.6 Extended equivalent slab method

Chapter-4

SEISMIC SAFETY OF FLAT SLAB BUILDING

4.1 Building data

4.2 Comparison of cost

4.3 Materials of construction

Chapter-5

METHODS OF ANALYSIS

5.1 Static analysis

5.2 Frequency analysis

5.3 Response spectra

5.4 Design spectra

5.5 Push over analysis

5.6 Time history

Chapter-6

RESULTS AND DISCUSSION

6.1 Static analysis and validation of model

6.2 Frequency analysis

6.3 Response spectra

6.4 Pushover Analysis

6.4.1 Modeling Approach

6.4.2 Modeling of Frame

6.4.3 Material nonlinearity

6.4.4 Geometric nonlinearity

6.4.5 Plastic deformation curve

Chapter-7

STABILITY OF FLAT SLAB- A CASE STUDY

7.1 Structural configuration

Fig-7.2 FEM model of city mall building

7.2 Loads on the building

7.2.1 Earthquake Load (EL)

7.3 Results and discussions

Chapter-8

CONCLUSIONS

PUBLICATIONS

Research Objectives and Thematic Focus

This dissertation aims to evaluate the seismic performance of flat slab buildings compared to conventional beam-column structures. The primary research goal is to assess the structural feasibility and stability of flat slab systems in high seismic zones, addressing the challenges associated with their inherent lack of lateral stiffness and vulnerability to punching shear failures.

• Performance estimation of flat slab buildings under seismic loads.
• Comparative analysis of static and dynamic behavior using various building codes.
• Investigation of failure patterns through non-linear pushover and time history analysis.
• Evaluation of cost-effectiveness and structural improvements using drop panels and camouflage beams.

Excerpt from the Book

Chapter Summaries

INTRODUCTION: Outlines the shift in construction practices towards flat slab systems and defines the research objectives regarding seismic safety and performance evaluation.

LITERATURE REVIEW: Provides a summary of historical research regarding the seismic response of flat slabs, including key contributions on modeling methods and punching shear reinforcement.

MODELLING OF FLAT SLAB BUILDINGS: Discusses the structural components of flat slab systems and details various modeling techniques used to simulate their behavior.

SEISMIC SAFETY OF FLAT SLAB BUILDING: Presents the numerical data and structural models used to analyze the seismic response and costs of various flat slab configurations.

METHODS OF ANALYSIS: Explains the mathematical and computational approaches, including static, frequency, response spectra, and non-linear pushover analyses employed in this study.

RESULTS AND DISCUSSION: Details the findings from the various analyses, covering stress distributions, deflections, and the evaluation of failure patterns.

STABILITY OF FLAT SLAB- A CASE STUDY: Applies the developed methodologies to a specific shopping mall case study to test performance in high seismic zones.

CONCLUSIONS: Summarizes the key findings, confirming that while flat slab systems offer architectural benefits, they require careful structural design for stability in seismic regions.

Keywords

Flat Slab, Seismic Safety, Punching Shear, Pushover Analysis, Time History Analysis, Lateral Deformation, Structural Stability, Finite Element Method, Equivalent Frame Method, Drop Panel, Camouflage Beam, Building Codes, Earthquake Resistance, Ductility, Reinforced Concrete.

Frequently Asked Questions

What is the core focus of this research?

The research focuses on the seismic performance and stability of reinforced concrete flat slab buildings compared to conventional beam-column structures, specifically in high seismic zones.

What are the central thematic fields covered in the work?

The study covers structural modeling, punching shear strength, seismic response analysis, cost-benefit comparisons, and the effect of structural modifications like drop panels on building stability.

What is the primary objective of this dissertation?

The main objective is to verify the feasibility of using flat slab structures in high seismic zones and to identify strategies to mitigate their vulnerability to brittle failure and large lateral deformations.

Which scientific methods are utilized to evaluate the structures?

The study employs a multi-faceted analysis approach including linear static analysis, frequency analysis, response spectrum analysis, non-linear static pushover analysis, and non-linear time history analysis using SAP 2000 software.

What topics are discussed in the main part of the dissertation?

The main body covers the modeling techniques for flat slabs, the assessment of seismic safety through numerical examples, a comparative analysis of different building codes, and a practical case study of a shopping mall.

Which keywords best characterize this work?

Key terms include Flat Slab, Seismic Safety, Punching Shear, Pushover Analysis, Lateral Deformation, and Finite Element Method.

Why is the flat slab-column junction considered critical?

It is the first point of yielding in buildings without braces. Lateral loading drastically reduces the shear capacity of this connection, making it highly susceptible to brittle punching failure during an earthquake.

How does the inclusion of drop panels affect structural performance?

Drop panels significantly enhance the punching shear strength of the flat slab and improve the overall ductility of the building, which is essential for earthquake resistance.

What is the role of the 'camouflage beam' in this study?

The camouflage beam is proposed as a viable alternative for flat slab buildings, as it allows for better performance than basic flat slab configurations when combined with increased slab thickness, even outperforming conventional designs in some cases.