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Title of Thesis

Performance Evaluation Of RC Structures Under Earthquake Loading

Author(s)

MUHAMMAD RIZWAN

Institute/University/Department Details
Department Of Civil Engineering / University Of Engineering And Technology, Lahore
Session
2008
Subject
Civil Engineering
Number of Pages
214
Keywords (Extracted from title, table of contents and abstract of thesis)
Performance, Evaluation, RC Structures, Earthquake, Loading, Confinement, seismic, residual, deformations

Abstract
Existing seismic risk in Pakistan, especially in its Northern Areas, emphasis for a detailed and careful design of RC structures to withstand expected earthquake loads. The seismic performance of RC multistory structures is a complex process. An accurate assessment of seismic behavior of RC structures requires an analysis carried out under time history or parameters of time history of real time recorded earthquakes. In Pakistan, a large data bank of strong motion recorders exists in analog form, and its use in performance assessment of structures is very difficult without digitizing it. The response of a multistory RC building is greatly dependant on performance of its columns especially in inelastic range, which can be improved by providing sufficient confinement. Post earthquake surveys revealed that most of the RC buildings collapsed due to insufficient performance of their columns, which were found deficient in confinement. A limited work has been carried out in Pakistan to study the performance of RC columns under axial and lateral loading. Internationally, the efforts are continued to enhance the performance of RC columns subjected to seismic loads.
The objective of this research has three main parts. The first part is to collect, segregate and digitize available analog form of earthquake data, which has been recorded in Pakistan. The second part is to device and test a technique which could enhance strength, ductility and stiffness of RC columns subjected to seismic loads and result in lesser residual deformations. The third part is to carry out seismic analysis of a RC multistory frame, using material behavior studied experimentally, under application of ground motion data of Pakistan.
A novel digitizing technique is developed in this study that extracts the trace of recorded acceleration as a whole by saving all points required to draw digitized ground acceleration. The proposed digitizing approach has been compared with the available techniques to assess its efficiency.
The confinement technique for RC columns developed in this study utilizes specialized rings of steel strips applied as transverse reinforcement in hinge zone. Eight large scale specimens have been cast and tested to study the performance of proposed technique. The experimental results indicated that proposed confining reinforcement, although with lesser volumetric ratio, improved the performance of RC columns by enhancing their shear resistance, ductility, energy dissipation capacity and reducing residual deformations.The columns confined by proposed technique have been named as Steel Strip Confined (SSC) columns. The observed column behavior has been modeled in Response-2000 and DRAIN-3DX.
RC frames are modeled in DRAIN-3DX using material properties calibrated with experimental data. The frames are analyzed under north-south component of El Centro ground motion and east-west component of Kashmir earthquake recorded at Abbottabad. The frames, modeled with properties of SSC columns, showed better performance by reducing the damage. The analysis indicates that Kashmir earthquake is more damaging in nature than El Centro ground motion.

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5,092 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 CONTENTS

 

vi
31 KB
2

1

INTRODUCTION

1.1 General

1.2 Aim and Objective
1.3 Scope of Work
1.4 Thesis Overview

1
22 KB
3 2 LITERATURE REVIEW

2.1 Introduction

2.2 Seismological background of Pakistan – an overview
2.3 Digitization of analog form of acclerograms

2.4 Confinement

2.5 Experimental performance of confined rc columns

2.6 Performance of RC buildings under seismic loads

6
608 KB
4 3 DIGITIZATION AND ANALYSIS OF SEISMIC DATA

3.1 Introduction

3.2 Seismological background of the region
3.3 Analog form of recorded acceleration
3.4 Digitizing approach
3.5 Modified digitizing approach

3.6 Design spectrums

3.7 Limitations

36
682 KB
5 4 PERFORMANCE OF CONVENTIONAL AND STEEL STRIP CONFINED RC COLUMNS

4.1 Introduction

4.2 Description of Specimens
4.3 Constituting materials
4.4 Construction of specimen
4.5 Testing arrangement
4.6 Loading history
4.7 Instrumentation and data acquisition system
4.8 Testing of specimen
4.9 Yield and ultimate points
4.10 Comparison of yielding, peak and ultimate cycles for critical direction
4.11 Lateral load capacity
4.12 Stiffness degradation
4.13 Ductility
4.14 Residual Displacements
4.15 Energy dissipation
4.16 Modeling on response 2000

62
2,472 KB
6 5 PERFORMANCE OF RC BUILDING

5.1 Introduction

5.2 Description of basic building structure
5.3 Ground motion selected
5.4 Description of modeling
5.5 Nonlinear time history analysis (NTHA)
5.6 Damage index used in performance evaluation
5.7 Analysis of CRCS-60 under application of El Centro ground motion
5.8 Analysis of CRCS-60 under application of Abbottabad ground motion
5.9 Analysis of crcs-60 under application of abbottabad-scaled ground motion
5.10 Analysis of SSC-02 under application of Abbottabad-scaled ground motion
5.11 Analysis of SSC-1.3 under application of Abbottabad-scaled ground motion
5.12 Comparison of El Centro, Abbottabad and Abbottabad-scaled ground motions
5.13 Summation of comparison of analysis of CRCS-60 frame analyzed by El Centro, Abbottabad and Abbottabad-scaled ground motion
5.14 Comparison of CRCS-60, SSC-02 and SSC-1.3 frames analyzed by Abbottabad ground motion
5.15 Summation of comparison of CRCS-60, SSC-02 and SSC-1.3

138
1,324 KB
7 6 CONCLUSIONS & RECOMMENDATIONS 189
17 KB
8 7 REFERENCES


 

193
103 KB