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Challenge

Project 1

PPreetish Suvaratna Jena1 Nov 2022

Q. Design raft foundation of a box bridge having dimensions “12” m span and “5.5” m height. (considering 1 m width) in stadd pro.

Ans

Aim of the project -

  • To Analyze and design the raft foundation by applying earth pressure, self-weight, surcharge loading and 70R vehicle loading and calculating bending moment, shear force & deflection through staad. pro as well as by manual calculation also.
  • So first of all the Vehicular underpass is modelled as portal frame structure in Staad.pro and analyzed for a unit length.
  • Various load as described applied to the structure and being analyzed.
  • Spring foundation assigned to the structue as per the calculated value for diffrent springs as per the length of the nodes considered for the spring foundation.

The Staad model has been created according to the sizes given.

  • The model with given sizes in the problem has been created.
  • Different Properties of the frame structure has been defined and assigned.
    • top slab
    • Bottom and side wall
    • Haunch Portion

      • SUPPORT IN STAAD

        KFY = C/C OF NODES * SPRING CONSTANT

        SPRING CONSTANT KN/m3 C/C NODE m KFY kn/m
        1600 =0.45+0.45/2 1080
        1600 =1.983/2+1.983/2 3172.8
        1600 =0.991 1586.64
        1600 =0.3 480
        1600 =1.983/2+1.883/2 3092.80
  • Load & Defination
    • For Normal load case
      • overburden load (Cushion)
      • Active Earth Pressure
      • Live load surcharge Left
      • Live load surcharge Right
      • Live load surcharge Both side
      • Breaking Load Left Side
      • Breaking Load Right Side
      • Temprature Load ( Uniform Rise)
      • Temprature Load ( Uniform Fall)
      • Temprature Load ( Gradient Rise)
      • Temprature Load ( Gradient Fall)

Loads

1 SELF WEIGHT (INCLUDING FILL) 6 LLS (BOTH)
2 SIDL 7 BRAKING (RIGHT)
3 EARTH PRESSURE 8 BRAKING (LEFT)
4 LLS (LEFT) 9 TEMPRATURE (UNIFORM RISE)
5 LLS (RIGHT)

Load Combinations

Combinations in Staad (ULS)

LOAD COMB 13 COMBINATION LOAD CASE 13
1 1.35 2 1.75 3 1.5
LOAD COMB 14 COMBINATION LOAD CASE 14
1 1.35 2 1.75 3 1.5 4 1.2
LOAD COMB 15 COMBINATION LOAD CASE 15
1 1.35 2 1.75 3 1.5 5 1.2
LOAD COMB 16 COMBINATION LOAD CASE 16
1 1.35 2 1.75 3 1.5 5 1.2 7 1.5
LOAD COMB 17 COMBINATION LOAD CASE 17
1 1.35 2 1.75 3 1.5 6 1.2
LOAD COMB 18 COMBINATION LOAD CASE 18
1 1.35 2 1.75 3 1.5 6 1.2 8 1.5
LOAD COMB 19 COMBINATION LOAD CASE 19
1 1.35 2 1.75 3 1.5 4 1.2 9 0.0
LOAD COMB 20 COMBINATION LOAD CASE 20
1 1.35 2 1.75 3 1.5 4 1.2 10 0.0
LOAD COMB 21 COMBINATION LOAD CASE 21
1 1.35 2 1.75 3 1.5 4 1.2 11 0.0
LOAD COMB 22 COMBINATION LOAD CASE 22
1 1.35 2 1.75 3 1.5 4 1.2 12 0.0
LOAD COMB 23 COMBINATION LOAD CASE 23
1 1.35 2 1.75 3 1.5 4 1.2 9 0.0 11 0.0
LOAD COMB 24 COMBINATION LOAD CASE 24
1 1.35 2 1.75 3 1.5 4 1.2 10 0.0 12 0.0
LOAD COMB 25 COMBINATION LOAD CASE 25
1 1.35 2 1.75 3 1.5 5 1.2 7 1.5 9 0.0
LOAD COMB 26 COMBINATION LOAD CASE 26
1 1.35 2 1.75 3 1.5 5 1.2 7 1.5 10 0.0
LOAD COMB 27 COMBINATION LOAD CASE 27
1 1.35 2 1.75 3 1.5 5 1.2 7 1.5 11 0.0
LOAD COMB 28 COMBINATION LOAD CASE 28
1 1.35 2 1.75 3 1.5 5 1.2 7 1.5 12 0.0
LOAD COMB 29 COMBINATION LOAD CASE 29
1 1.35 2 1.75 3 1.5 5 1.2 7 1.5 9 0.0 11 0.0
LOAD COMB 30 COMBINATION LOAD CASE 30
1 1.35 2 1.75 3 1.5 5 1.2 6 1.5 10 0.0 11 0.0
LOAD COMB 31 COMBINATION LOAD CASE 31
1 1.35 2 1.75 3 1.5 6 1.2 8 1.5 9 0.0
LOAD COMB 32 COMBINATION LOAD CASE 32
1 1.35 2 1.75 3 1.5 6 1.2 8 1.5 10 0.0
LOAD COMB 33 COMBINATION LOAD CASE 33
1 1.35 2 1.75 3 1.5 6 1.2 8 1.5 11 0.0
LOAD COMB 34 COMBINATION LOAD CASE 34
1 1.35 2 1.75 3 1.5 6 1.2 8 1.5 12 0.0
LOAD COMB 35 COMBINATION LOAD CASE 35
1 1.35 2 1.75 3 1.5 6 1.2 8 1.5 9 0.0 11 0.0
LOAD COMB 36 COMBINATION LOAD CASE 36
1 1.35 2 1.75 3 1.5 6 1.2 8 1.5 10 0.0 12 0.0
LOAD COMB 37 COMBINATION LOAD CASE 37
1 1.35 2 1.75 3 1.5 9 0.0
LOAD COMB 38 COMBINATION LOAD CASE 38
1 1.35 2 1.75 3 1.5 10 0.0
LOAD COMB 39 COMBINATION LOAD CASE 39
1 1.35 2 1.75 3 1.5 11 0.0
LOAD COMB 40 COMBINATION LOAD CASE 40
1 1.35 2 1.75 3 1.5 12 0.0
LOAD COMB 41 COMBINATION LOAD CASE 41
1 1.35 2 1.75 3 1.5 9 0.0 11 0.0
LOAD COMB 42 COMBINATION LOAD CASE 42
1 1.35 2 1.75 3 1.5 10 0.0 12 0.0

Combinations in Staad (SLS)

******** Normal Case *********
LOAD COMB 43 COMBINATION LOAD CASE 43
1 1.0 2 1.0 3 1.0
LOAD COMB 44 COMBINATION LOAD CASE 44
1 1.0 2 1.0 3 1.0 4 0.8
LOAD COMB 45 COMBINATION LOAD CASE 45
1 1.0 2 1.0 3 1.0 5 0.8
LOAD COMB 46 COMBINATION LOAD CASE 46
1 1.0 2 1.0 3 1.0 5 0.8 7 1.0
LOAD COMB 47 COMBINATION LOAD CASE 47
1 1.0 2 1.0 3 1.0 6 0.8
LOAD COMB 48 COMBINATION LOAD CASE 48
1 1.0 2 1.0 3 1.0 6 0.8 8 1.0

*** Normal Case + Temperature load (accompanying)*********
LOAD COMB 49 COMBINATION LOAD CASE 49
1 1.0 2 1.0 4 0.8 3 1.0 9 0.6
LOAD COMB 50 COMBINATION LOAD CASE 50
1 1.0 2 1.0 3 1.0 4 0.8 10 0.6
LOAD COMB 51 COMBINATION LOAD CASE 51
1 1.0 2 1.0 3 1.0 4 0.8 11 0.6
LOAD COMB 52 COMBINATION LOAD CASE 52
1 1.0 2 1.0 3 1.0 4 0.8 12 0.6
LOAD COMB 53 COMBINATION LOAD CASE 53
1 1.0 2 1.0 3 1.0 4 0.8 9 0.6 11 0.6
LOAD COMB 54 COMBINATION LOAD CASE 54
1 1.0 2 1.0 3 1.0 4 0.8 10 0.6 12 0.6
LOAD COMB 55 COMBINATION LOAD CASE 55
1 1.0 2 1.0 3 1.0 5 0.8 7 1.0 9 0.6
LOAD COMB 56 COMBINATION LOAD CASE 56
1 1.0 2 1.0 3 1.0 5 0.8 7 1.0 10 0.6
LOAD COMB 57 COMBINATION LOAD CASE 57
1 1.0 2 1.0 3 1.0 5 0.8 7 1.0 11 0.6
LOAD COMB 58 COMBINATION LOAD CASE 58
1 1.0 2 1.0 3 1.0 5 0.8 7 1.0 12 0.6
LOAD COMB 59 COMBINATION LOAD CASE 59
1 1.0 2 1.0 3 1.0 5 0.8 7 1.0 9 0.6 11 0.6
LOAD COMB 60 COMBINATION LOAD CASE 60
1 1.0 2 1.0 3 1.0 5 0.8 7 1.0 10 0.6 12 0.6
LOAD COMB 61 COMBINATION LOAD CASE 61
1 1.0 2 1.0 3 1.0 6 0.8 8 1.0 9 0.6
LOAD COMB 62 COMBINATION LOAD CASE 62
1 1.0 2 1.0 3 1.0 6 0.8 8 1.0 10 0.6
LOAD COMB 63 COMBINATION LOAD CASE 63
1 1.0 2 1.0 3 1.0 6 0.8 8 1.0 11 0.6
LOAD COMB 64 COMBINATION LOAD CASE 64
1 1.0 2 1.0 3 1.0 6 0.8 8 1.0 12 0.6
LOAD COMB 65 COMBINATION LOAD CASE 65
1 1.0 2 1.0 3 1.0 6 0.8 8 1.0 9 0.6 11 0.6
LOAD COMB 66 COMBINATION LOAD CASE 66
1 1.0 2 1.0 3 1.0 6 0.8 8 1.0 10 0.6 12 0.6
LOAD COMB 67 COMBINATION LOAD CASE 67
1 1.0 2 1.0 3 1.0 9 0.6
LOAD COMB 68 COMBINATION LOAD CASE 68
1 1.0 2 1.0 3 1.0 10 0.6
LOAD COMB 69 COMBINATION LOAD CASE 69
1 1.0 2 1.0 3 1.0 11 0.6
LOAD COMB 70 COMBINATION LOAD CASE 70
1 1.0 2 1.0 3 1.0 12 0.6
LOAD COMB 71 COMBINATION LOAD CASE 71
1 1.0 2 1.0 3 1.0 9 0.6 11 0.6
LOAD COMB 72 COMBINATION LOAD CASE 72
1 1.0 2 1.0 3 1.0 10 0.6 12 0.6

*** Normal Case + Temperature load (leading)*********
LOAD COMB 73 COMBINATION LOAD CASE 73
1 1.0 2 1.0 3 1.0 4 0.8 9 1.0
LOAD COMB 74 COMBINATION LOAD CASE 74
1 1.0 2 1.0 3 1.0 4 0.8 10 1.0
LOAD COMB 75 COMBINATION LOAD CASE 75
1 1.0 2 1.0 3 1.0 4 0.8 11 1.0
LOAD COMB 76 COMBINATION LOAD CASE 76
1 1.0 2 1.0 3 1.0 4 0.8 12 1.0
LOAD COMB 77 COMBINATION LOAD CASE 77
1 1.0 2 1.0 3 1.0 4 0.8 10 1.0 12 1.0
LOAD COMB 78 COMBINATION LOAD CASE 78
1 1.0 2 1.0 3 1.0 5 0.8 7 0.75 9 1.0
LOAD COMB 79 COMBINATION LOAD CASE 79
1 1.0 2 1.0 3 1.0 5 0.8 7 0.75 10 1.0
LOAD COMB 80 COMBINATION LOAD CASE 80
1 1.0 2 1.0 3 1.0 5 0.8 7 0.75 11 1.0
LOAD COMB 81 COMBINATION LOAD CASE 81
1 1.0 2 1.0 3 1.0 7 0.75 12 1.0 5 0.8
LOAD COMB 82 COMBINATION LOAD CASE 82
1 1.0 2 1.0 3 1.0 5 0.8 7 0.75 9 1.0 11 1.0
LOAD COMB 83 COMBINATION LOAD CASE 83
1 1.0 2 1.0 3 1.0 5 0.8 7 0.75 10 1.0 12 1.0
LOAD COMB 84 COMBINATION LOAD CASE 84
1 1.0 2 1.0 3 1.0 6 0.8 9 0.75 10 1.0
LOAD COMB 85 COMBINATION LOAD CASE 85
1 1.0 2 1.0 3 1.0 6 0.8 8 0.75 10 1.0
LOAD COMB 86 COMBINATION LOAD CASE 86
1 1.0 2 1.0 3 1.0 6 0.8 8 0.75 11 1.0
LOAD COMB 87 COMBINATION LOAD CASE 87
1 1.0 2 1.0 3 1.0 6 0.8 8 0.75 12 1.0
LOAD COMB 88 COMBINATION LOAD CASE 88
1 1.0 2 1.0 3 1.0 6 0.8 8 0.75 9 1.0 11 1.0
LOAD COMB 89 COMBINATION LOAD CASE 89
1 1.0 2 1.0 3 1.0 6 0.8 8 0.75 10 1.0 12 1.0
LOAD COMB 90 COMBINATION LOAD CASE 90
1 1.0 2 1.0 3 1.0 9 1.0
LOAD COMB 91 COMBINATION LOAD CASE 91
1 1.0 2 1.0 3 1.0 10 1.0
LOAD COMB 92 COMBINATION LOAD CASE 92
1 1.0 2 1.0 3 1.0 11 1.0
LOAD COMB 93 COMBINATION LOAD CASE 93
1 1.0 2 1.0 3 1.0 12 1.0
LOAD COMB 94 COMBINATION LOAD CASE 94
1 1.0 2 1.0 3 1.0 9 1.0 11 1.0
LOAD COMB 95 COMBINATION LOAD CASE 95
1 1.0 2 1.0 3 1.0 10 1.0 12 1.0

Combinations in Staad (SLS-Quasi-permanent)

******** Normal Case *********

LOAD COMB 96 COMBINATION LOAD CASE 96
1 1.0 2 1.0 3 1.0
LOAD COMB 97 COMBINATION LOAD CASE 97
1 1.0 2 1.0 3 1.0 4 0.0
LOAD COMB 98 COMBINATION LOAD CASE 98
1 1.0 2 1.0 3 1.0 5 0.0
LOAD COMB 99 COMBINATION LOAD CASE 99
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0
LOAD COMB 100 COMBINATION LOAD CASE 100
1 1.0 2 1.0 3 1.0 6 0.0
LOAD COMB 101 COMBINATION LOAD CASE 101
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0

*** Normal Case + Temperature load (accompanying)*********
LOAD COMB 102 COMBINATION LOAD CASE 102
1 1.0 2 1.0 3 1.0 4 0.0 9 0.5
LOAD COMB 103 COMBINATION LOAD CASE 103
1 1.0 2 1.0 3 1.0 4 0.0 10 0.5
LOAD COMB 104 COMBINATION LOAD CASE 104
1 1.0 2 1.0 3 1.0 4 0.0 11 0.5
LOAD COMB 105 COMBINATION LOAD CASE 105
1 1.0 2 1.0 3 1.0 4 0.0 12 0.5
LOAD COMB 106 COMBINATION LOAD CASE 106
1 1.0 2 1.0 3 1.0 4 0.0 9 0.5 11 0.5
LOAD COMB 107 COMBINATION LOAD CASE 107
1 1.0 2 1.0 3 1.0 4 0.0 10 0.5 12 0.5
LOAD COMB 108 COMBINATION LOAD CASE 108
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 9 0.5
LOAD COMB 109 COMBINATION LOAD CASE 109
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 10 0.5
LOAD COMB 110 COMBINATION LOAD CASE 110
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 11 0.5
LOAD COMB 111 COMBINATION LOAD CASE 111
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 12 0.5
LOAD COMB 112 COMBINATION LOAD CASE 112
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 9 0.5 11 0.5
LOAD COMB 113 COMBINATION LOAD CASE 113
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 10 0.5 12 0.5
LOAD COMB 114 COMBINATION LOAD CASE 114
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 9 0.5
LOAD COMB 115 COMBINATION LOAD CASE 115
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 10 0.5
LOAD COMB 116 COMBINATION LOAD CASE 116
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 11 0.5
LOAD COMB 117 COMBINATION LOAD CASE 117
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 12 0.5
LOAD COMB 118 COMBINATION LOAD CASE 118
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 9 0.5 11 0.5
LOAD COMB 119 COMBINATION LOAD CASE 119
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 10 0.5 12 0.5
LOAD COMB 120 COMBINATION LOAD CASE 120
1 1.0 2 1.0 3 1.0 9 0.5
LOAD COMB 121 COMBINATION LOAD CASE 121
1 1.0 2 1.0 3 1.0 10 0.5
LOAD COMB 122 COMBINATION LOAD CASE 122
1 1.0 2 1.0 3 1.0 11 0.5
LOAD COMB 123 COMBINATION LOAD CASE 123
1 1.0 2 1.0 3 1.0 12 0.5
LOAD COMB 124 COMBINATION LOAD CASE 124
1 1.0 2 1.0 3 1.0 9 0.5 11 0.5
LOAD COMB 125 COMBINATION LOAD CASE 125
1 1.0 2 1.0 3 1.0 10 0.5 12 0.5

*** Normal Case + Temperature load (leading)*********
LOAD COMB 126 COMBINATION LOAD CASE 126
1 1.0 2 1.0 3 1.0 4 0.0 9 0.0
LOAD COMB 127 COMBINATION LOAD CASE 127
1 1.0 2 1.0 3 1.0 4 0.0 10 0.0
LOAD COMB 128 COMBINATION LOAD CASE 128
1 1.0 2 1.0 3 1.0 4 0.0 11 0.0
LOAD COMB 129 COMBINATION LOAD CASE 129
1 1.0 2 1.0 3 1.0 4 0.0 12 0.0
LOAD COMB 130 COMBINATION LOAD CASE 130
1 1.0 2 1.0 3 1.0 4 1.0 9 0.0 11 0.0
LOAD COMB 131 COMBINATION LOAD CASE 131
1 1.0 2 1.0 3 1.0 4 1.0 10 0.0 12 0.0
LOAD COMB 132 COMBINATION LOAD CASE 132
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 9 0.0
LOAD COMB 133 COMBINATION LOAD CASE 133
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 10 0.0
LOAD COMB 134 COMBINATION LOAD CASE 134
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 11 0.0
LOAD COMB 135 COMBINATION LOAD CASE 135
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 12 0.0
LOAD COMB 136 COMBINATION LOAD CASE 136
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 9 0.0 11 0.0
LOAD COMB 137 COMBINATION LOAD CASE 137
1 1.0 2 1.0 3 1.0 5 0.0 7 0.0 10 0.0 12 0.0
LOAD COMB 138 COMBINATION LOAD CASE 138
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 9 0.0
LOAD COMB 139 COMBINATION LOAD CASE 139
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 10 0.0
LOAD COMB 140 COMBINATION LOAD CASE 140
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 11 0.0
LOAD COMB 141 COMBINATION LOAD CASE 141
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 12 0.0
LOAD COMB 142 COMBINATION LOAD CASE 142
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 9 0.0 11 0.0
LOAD COMB 143 COMBINATION LOAD CASE 143
1 1.0 2 1.0 3 1.0 6 0.0 8 0.0 10 0.0 12 0.0
LOAD COMB 144 COMBINATION LOAD CASE 144
1 1.0 2 1.0 3 1.0 9 0.0
LOAD COMB 145 COMBINATION LOAD CASE 145
1 1.0 2 1.0 3 1.0 10 0.0
LOAD COMB 146 COMBINATION LOAD CASE 146
1 1.0 2 1.0 3 1.0 11 0.0
LOAD COMB 147 COMBINATION LOAD CASE 147
1 1.0 2 1.0 3 1.0 12 0.0
LOAD COMB 148 COMBINATION LOAD CASE 148
1 1.0 2 1.0 3 1.0 9 0.0 11 0.0
LOAD COMB 149 COMBINATION LOAD CASE 149
1 1.0 2 1.0 3 1.0 10 0.0 12 0.0

Load & Defination

  • For Live load case
    • 70R Bogie on Mid span
    • 70R bogie on edge
    • 70 R Tracked on mid span
    • 70 R tracked on edge
    • Class -AA tracked on mid span
    • Class- AA tracked on edge
  • Bending moment diagram for diffrent load cases & combinations
    • ULS
      • Normal Load Case
    • SLS
      • Normal Load Case
      • Normal Case + Temperature load (accompanying)
      • Normal Case + Temperature load (leading)
    • SLS-Quasi permanent
      • Normal Load Case
      • Normal Case + Temperature load (accompanying)
      • Normal Case + Temperature load (leading)
  • Bending moment diagram for Live load cases

Design Sheet & Calculation

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