ANALYSIS OF SHALLOW BURIED REINFORCED .ANALYSIS OF SHALLOW BURIED REINFORCED CONCRETE BOX STRUCTURES...

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Transcript of ANALYSIS OF SHALLOW BURIED REINFORCED .ANALYSIS OF SHALLOW BURIED REINFORCED CONCRETE BOX STRUCTURES...

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    ANALYSIS OF SHALLOW BURIED REINFORCED CONCRETE BOX STRUCTURES SUBJECTED TO AIRBLAST LOADS

    By

    KAY HYANG CHEE

    A THESIS PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT

    OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE

    UNIVERSITY OF FLORIDA

    2008

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    2008 Kay Hyang Chee

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    To my lovely wife

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    ACKNOWLEDGMENTS

    I thank my advisor, Dr Theodor Krauthammer, for his advice and guidance. I want to

    express my appreciation to Dr Serdar Astarlioglu for his valuable suggestions and help in the

    programming aspects. I am grateful to the Defence Science and Technology Agency, Singapore,

    for the postgraduate scholarship. I thank all of my friends at the Center for Infrastructure

    Protection and Physical Security, University of Florida and Maguire Village, for a great stay and

    experience in Gainesville.

    Last of all, I thank my dear wife, Hiong Suan, for all she has done for me and her

    willingness to sacrifice many things over the last two years.

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    TABLE OF CONTENTS page

    ACKNOWLEDGMENTS ...............................................................................................................4

    LIST OF TABLES ...........................................................................................................................7

    LIST OF FIGURES .........................................................................................................................8

    LIST OF SYMBOLS .....................................................................................................................12

    ABSTRACT ...................................................................................................................................16

    CHAPTER

    1 INTRODUCTION ..................................................................................................................17

    1.1 Problem Statement ........................................................................................................17 1.2 Objectives and Scope ....................................................................................................18 1.3 Research Significance ...................................................................................................18

    2 BACKGROUND AND LITERATURE REVIEW ................................................................19

    2.1 Introduction ...................................................................................................................19 2.2 Blast Loads ....................................................................................................................19

    2.2.1 Airblast from High Explosive ...........................................................................20 2.2.2 Nuclear Devices ................................................................................................21

    2.3 Effects on Buried Structures .........................................................................................22 2.3.1 Soil Arching Effect ...........................................................................................22

    2.4 Dynamic Structural Behavior and Analysis ..................................................................24 2.4.1 Single-Degree-of-Freedom (SDOF) System .....................................................27 2.4.2 Transformation Factors for Equivalent SDOF ..................................................28 2.4.3 Numerical Integration (Newmark-Beta method) ..............................................29

    2.5 Behavior of Reinforced Concrete Slabs ........................................................................30 2.5.1 Flexural Behavior: Johansens Yield Line Theory ...........................................30 2.5.2 Flexural Behavior: Membrane Action ..............................................................31 2.5.3 Slab Compressive Membrane ...........................................................................33 2.5.4 Slab Tensile Membrane.....................................................................................38 2.5.5 Reinforced Concrete Slab Flexural Model ........................................................39 2.5.6 Direct Shear Behavior .......................................................................................40 2.5.7 Hawkins Shear Model .......................................................................................41 2.5.8 Dynamic Resistance Function and Response ....................................................43

    2.6 Pressure-Impulse Diagrams and their Application .......................................................46 2.6.1 Characteristics of P-I Diagram ..........................................................................46 2.6.2 Numerical Approach to P-I Diagram ................................................................48 2.6.3 Multiple Failure Modes .....................................................................................48

    2.7 Summary .......................................................................................................................50

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    3 METHODOLOGY .................................................................................................................51

    3.1 Introduction ...................................................................................................................51 3.2 Flexural Mode ...............................................................................................................51

    3.2.1 Externally Applied Thrust .................................................................................51 3.2.2 Numerical Approach for Resistance Curve Calculation ...................................54 3.2.3 Variation of Mass and Load Factor ...................................................................58

    3.3 Soil Structural Interaction .............................................................................................60 3.3.1 Influence of Parameters on Soil Arching Effect ...............................................60 3.3.2 Effect on SDOF Load and Mass Factor ............................................................61

    3.4 Direct Shear Mode ........................................................................................................65 3.4.1 Resistance Curve ...............................................................................................65 3.4.2 Shear Mass and Load Factors ...........................................................................67

    3.5 Shear Failure Mode for Slab .........................................................................................68 3.6 Program Flowchart ........................................................................................................70 3.7 Summary .......................................................................................................................70

    4 RESULTS AND DISCUSSIONS...........................................................................................73

    4.1 Introduction ...................................................................................................................73 4.2 Validation with Experimental Data ...............................................................................73

    4.2.1 Test FH1 ............................................................................................................74 4.2.2 Test FH2 ............................................................................................................77 4.2.3 Test FH3 ............................................................................................................81 4.2.4 Test FH4 ............................................................................................................84 4.2.5 Test FH5 ............................................................................................................88 4.2.6 Test FH6 ............................................................................................................92 4.2.7 Summary ...........................................................................................................96

    4.3 Assessment by P-I Diagrams ........................................................................................96 4.4 Summary .....................................................................................................................100

    5 CONCLUSIONS AND RECOMMENDATIONS ...............................................................101

    5.1 Summary .....................................................................................................................101 5.2 Conclusions .................................................................................................................101 5.3 Recommendations for Future Study ...........................................................................102

    APPENDIX EXPERIMENT TEST ON SHALLOW BURIED FLAT ROOF STRUCTURES ....................................................................................................................103

    LIST OF REFERENCES .............................................................................................................113

    BIOGRAPHICAL SKETCH .......................................................................................................115

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    LIST OF TABLES

    Table page 4-1 Summary of results ..........................................................................................