THE BEHAVIOUR OF PROFILED STEEL SHEET/CONCRETE COMPOSITE SLABS

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Ph.D Thesis on THE BEHAVIOUR OF PROFILED STEEL SHEET/CONCRETE COMPOSITE SLABS includes finite element simulation using Ansys software

Text of THE BEHAVIOUR OF PROFILED STEEL SHEET/CONCRETE COMPOSITE SLABS

  • THE BEHAVIOUR OF PROFILED

    STEEL SHEET/CONCRETE

    COMPOSITE SLABS

    Imad E. H. Shobaki

    School of Environment & Life Sciences

    Division of Civil & Environmental Engineering

    University of Salford, Salford, UK

    , Submitted in Partial Fulfilment for the Degree of

    Doctor of Philosophy, October 2000

  • THE BEHAVIOUR OF PROFILED

    STEEL SHEET/CONCRETE

    COMPOSITE SLABS

    Imad E. H SHOBAKI

    Ph. D. Thesis 2000

  • Contents

    Contents ......................................................................................................................... i

    List of illustrations ..................................................................................................... vii

    List of tables ................................................................................................................ Xi

    Acknowledgements .................................................................................................... xii

    Abstract ..................................................................................................................... xiii

    Notation ..................................................................................................................... xiv

    Abbreviations .......................................................................................................... xviii

    Chapter One: Introduction

    1.1 Introduction ........................................................................................................... 1

    1.2 Composite slabs with profiled steel sheets ........................................................... 3

    1.3 Profiled steel sheeting ............................................................................................ 4

    1.4 Shapes and position of embossments ................................................................... 4

    1.5 Definition of shear-bond strength ........................................................................ 5

    1.6 Composite structures using profiled steel sheeting ............................................ 6

    1.7 Advantages of composite structures .................................................................... 7

    1.8 The use of composite structures ........................................................................... 7

    1.9 Composite behaviour ............................................................................................. 8

    1.10 Scope of the problem investigated in this thesis ................................................ 8

    1.11 Outline of the thesis ........................................................................................... 10

    Chapter Two: Shear-Bond in Composite Construction

    2.1 Introduction ......................................................................................................... 17

    2.2 Bond in conventional reinforced concrete ......................................................... 17 2.2.1 Bond for coated reinforcing bars and sheeting ............................................... 18

    2.2.2 Bond stress-slip relationship ........................................................................... 19

    2.2.3 Anchorage length ............................................................................................ 20 i

  • 2.3 Composite beams ................................................................................................. 21 2.3.1 General ............................................................................................................ 21 2.3.2 Composite beams with solid concrete slabs ................................................... 21 2.3.3 Composite beams with composite concrete slabs ........................................... 22

    2.4 Profiled composite slabs ...................................................................................... 23 2.4.1 General ............................................................................................................ 23 2.4.2 Design criteria and failure modes ................................................................... 24 2.4.3 Ductility .......................................................................................................... 26 2.4.4 Propped and unpropped construction ............................................................. 27 2.4.4.1 Temporary supports (propped) ................................................................ 27 2.4.4.2 Deflection during construction (unpropped) ........................................... 28

    2.5 Design methods .................................................................................................... 29 2.5.1 The `m-k' method ........................................................................................... 29 2.5.2 The partial shear connection method .............................................................. 31 2.5.2.1 General ..................................................................................................... 31 2.5.2.2. Determination of the bending resistance ................................................ 32 2.5.2.3 Determination of the horizontal shear strength iu. Rd ............................. 34 2.5.2.4 Extension of partial connection method .................................................. 35

    2.6 Mechanical interlock and friction ...................................................................... 36

    2.7 Numerical modelling ........................................................................................... 37

    Chapter Three: Small Scale Tests on Composite Slabs to investigate Longitudinal Shear/Slip Behaviour

    Summary .................................................................................................................... 45

    3.1 Introduction ......................................................................................................... 46

    3.2 Conventional reinforced concrete ...................................................................... 47

    3.3 Composite slabs .................................................................................................... 48

    3.4 Push-off and Pull-out tests .................................................................................. 49 3.4.1 General ............................................................................................................ 49 3.4.2 Preparation of the specimens .......................................................................... 50 3.4.3 Test set-up ....................................................................................................... 51 3.4.4 Test results and comments .............................................................................. 51

    3.5 Frictional coefficient ............................................................................................ 53

    3.6 Discussion ............................................................................................................. 54

    3.7 Conclusions ........................................................................................................... 54

    ii

  • Chapter Four: Full-Scale Tests

    4.1 Introduction ......................................................................................................... 77

    4.2 Composite slabs .................................................................................................... 77

    4.3 Materials ............................................................................................................... 78 4.3.1 Profiled steel sheeting ..................................................................................... 78 4.3.2 Concrete ..........................................................................................................

    78 4.3.3 Mesh reinforcement ........................................................................................

    78 4.3.4 Additional reinforcement ................................................................................

    79

    4.4 Casting ................................................................................................................. 79

    4.5 Test set-up ............................................................................................................ 80

    4.6 Arrangement ........................................................................................................ 80 4.6.1 Slip gauges ......................................................................................................

    80 4.6.2 Deflection gauges ...........................................................................................

    81

    4.7 Test loading procedure ........................................................................................ 81

    4.8 History of load-deflection behaviour ................................................................. 82

    4.9 Load-end slip behaviour ..................................................................................... 82

    4.10 Failure characteristics ....................................................................................... 82

    4.11 Slab behaviour during load application .......................................................... 83 4.11.1 Results summary ...........................................................................................

    83

    4.12 Regression line ................................................................................................... 85

    4.13 Evaluation of design loads .......................................................................