Alternative Support Systems for Cantilever - National Transportation ...

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DEVELOPMENT LENGTHS OF FLEXURAL REINF. Development Length of Longitudinal Bars Longitudinal Steel Longitudinal Steel Area Longitudinal Steel Diameter Yield Strength of Longitudinal Steel Input Development Length of Longitudinal Rein<strong>for</strong>cement Ψt := 1.3 Ψe := 1.0 Ψs := 1.0 λ := 1.0 Along 0.2 in 2 = dlong = 0.5 in fy_long = 60 ksi ACI 318-05 12.5.2 Cb_Ktr := 2.5in ACI 318-05 12.2.3 ldh_long := ⎡ ⎢⎛ ⎜ ⎢⎝ ⎢ ⎣ 3 40 ⎞ ⎛ ⎟⎠ ⋅⎜ ⎜ ⎜ ⎝ f y_long fc psi psi ⋅ ⎞ ⎟ ⎟ ⎟ ⎠ ( ) Ψt⋅Ψe⋅Ψ s⋅λ ⋅ Cb_Ktr ⎛ ⎜ ⎝ d long ⎞ ⎟ ⎠ ⎤ ⎥ ⎥ ⎥ ⎦ ⋅dlong ldh_long = 7.89 in ACI 318-05 12.2.3 ld_long := ldh_long ld_long = 7.89 in ⎛ ⎜ ⎝ ⎞ ACI 318-05 12.2.5 ld_long ld_l := ceil ⎟⋅in l in d_l = 8 in ⎠ Development Length of Longitudinal Bars Length of Shaft Required Length of Stiffeners L = 7 in Length of Breakout lbreakout = 12.54 in Length of Shaft Ls = 36 in Development Length of Longitudinal Rein<strong>for</strong>cement ld_l = 8 in Required Cover c_cover := 2.5in 148
Required Length of Shaft Based on Breakout and Development Length lshaft := lbreakout + c_cover + ld_l ( ) Check_Shaft_Length := if Ls ≥ lshaft, "Sufficient" , "Not Sufficient" Length of Shaft Required SUPERSTRUCTURE Superstructure Assembly Strength - Pipes Superstructure Test Assembly Pipe Pipe Properties - HSS 16x.500 lshaft = 23.04 in Check_Shaft_Length = "Sufficient" Design Wall Thickness tpipe := .465in Cross Sectional Area of Pipe A pipe 22.7in 2 := Diameter to Wall Thickness Ratio D_t := 34.4 Nominal Weight Wpipe 82.85 lbf := ft Moment of Inertia Ipipe 685in 4 := Elastic Section Modulus S pipe 85.7in 3 := Radius of Gyration rpipe := 5.49in Plastic Section Modulus Z pipe 112in 3 := Diameter of the Pipe Dpipe := 20in Torsional Constant J pipe 1370in 4 := HSS Torsional Constant C pipe 171in 3 := Yield Strength Fy_pipe = 42 ksi Ultimate Strength Fu_pipe = 58 ksi Modulus of Elasticity E := 29000ksi Length of Short Superstructure Pipe Ls_pipe := 17in Length of Long Superstructure Pipe Ll_pipe := 9ft 149
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Report No. BDK75 977-04 Date: Augus
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Metric Conversion Table SYMBOL WHEN
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ALTERNATIVE SUPPORT SYSTEMS FOR CAN
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EXECUTIVE SUMMARY During the 2004 h
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CHAPTER TABLE OF CONTENTS 1 INTRODU
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Torsion Test Data .................
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LIST OF FIGURES Figure page Figure
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Figure 4-15. Arrangement of the LVD
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CHAPTER 1 INTRODUCTION This project
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CHAPTER 2 BACKGROUND The following
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information obtained in the late 19
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these problems. The concern with fa
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opposite side, see Figure 2-2 The s
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2.2.4 Helical Pipes This option wou
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2.3 Alternative Foundations from Ot
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Figure 2-10. Drilled concrete piles
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Figure 2-13. Grouted soil anchors G
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The pad and pier foundation, found
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comments and recommendations on pre
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CHAPTER 3 DESIGN IMPLICATIONS Based
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Figure 3-2. Differences between con
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2 [ ] 2 2 ( r ) + 3. 25 ( r ) − (
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eakout surface for a single plate,
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strength of a headed anchor in tens
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Figure 3-9. Schematic of anticipate
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Vbfp l e tfp bfp f’c ca1 = the ba
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3.2.2 Equivalent Side-Face Blowout
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computed. See Equation 3-14 below t
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One method to quantify the failure
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• An additional 12-4.5” long, 1
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Applied load Lever arm Figure 4-4.
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Figure 4-8. Isometric view of embed
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Flexural plate breakout area Torsio
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4.2.4 Annular Base Plate Design The
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torsional strength of the lever arm
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4.4 Concrete Block and Tie-Down Des
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Figure 4-13. Arrangement of the LVD
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4.7 Summary of Torsion and Flexure
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foundation displayed the predicted
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Figure 5-5. Specimen at failure 5.1
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Figure 5-7. Torsional moment and ro
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torsional 45 degree crack formation
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Figure 5-11. Widening of concrete b
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Failure cracks widen Bond loosens F
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Rear of shaft Figure 5-14. Load and
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testing, signifying that the predic
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provided in NCHRP Report 412 were i
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6.2.2 Tapered Embedded Steel Pipe a
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Figure 6-3. FDOT Design Standards I
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This option provides a possible alt
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6.2.5 Cast-in-Place Solid Concrete
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This option does have some disadvan
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Figure 6-9. Embedded steel pipe and
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However, the fillet welds are susce
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APPENDIX A TEST APPARATUS DRAWINGS
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Figure A-3. Dimensioned side elevat
Page 113 and 114: Figure A-5. Dimensioned drawings of
Page 115 and 116: Figure A-7. Dimensioned plan drawin
Page 117 and 118: Figure A-9. Dimensioned drawing of
Page 119 and 120: Figure A-11. Dimensioned view of em
Page 121 and 122: STIFFENER DESIGN Calculation of Cap
Page 123 and 124: L breakout Concrete Breakout Equiva
Page 125 and 126: Abrg L⋅b 7 in 2 := = .5 Nsb 200
Page 127 and 128: β 1 f c Calculations Using ACI Str
Page 129 and 130: Determine Flexural Capacity of Roun
Page 131 and 132: DEVELOPMENT LENGTHS OF FLEXURAL REI
Page 133 and 134: Short Pipe Design Flexural Strength
Page 135 and 136: Long Pipe Design Flexural Strength
Page 137 and 138: Superstructure Assembly Strength -
Page 139 and 140: Weld Design Tn_blowout Vweld := Tor
Page 141 and 142: Check_Bolt_Shear := "Sufficient Str
Page 143 and 144: Check Reinforcement No_Bars_Block_R
Page 145 and 146: Tie-Down Design Block Properties Wi
Page 147 and 148: Vmax Total Load that the Tie-down m
Page 149 and 150: λpf := .38⋅ λpw := 3.76⋅ E F
Page 151 and 152: Input and Properties Shaft Torsion
Page 153 and 154: ψcV := 1.4 ψecV := 1.0 ψedV := 1
Page 155 and 156: lbreakout := L + 2⋅1.5ca1 lbreako
Page 157 and 158: Rn_weld := Throat⋅FW Rn_weld 11.1
Page 159 and 160: ⎛ ⎜ ⎜⎜⎜⎜⎜⎜⎜ 9.250
Page 161 and 162: Flexural Capacity of T-Plates Using
Page 163: FAILURE EQUATIONS Torsion Threshold
Page 167 and 168: Design Axial Strength ϕcomp := .90
Page 169 and 170: Design Axial Strength ϕcomp := .90
Page 171 and 172: Zp := ⎛ ⎜ ⎝ bp tp⋅ 2 ⎞
Page 173 and 174: Bolt Properties - D1" ASTM A325 Cen
Page 175 and 176: CONCRETE BLOCK Concrete Block Desig
Page 177 and 178: Check Shear Check_Shear_B := "Suffi
Page 179 and 180: 7'-4" 8" 5'-4" 8" 1'-3" Calculate s
Page 181 and 182: Required Capacity of the Channel As
Page 183 and 184: Check_Flange_Compact_Unit := "Compa
Page 185 and 186: Rear of Shaft Face of Shaft Figure
Page 187 and 188: Bolt slippage ends Predicted failur
Page 189 and 190: APPENDIX D DESIGN GUIDELINES For th
Page 191 and 192: The designer should then use this i
Page 193 and 194: • Determine the angle required fo
Page 195 and 196: Superstructure Base Connection Foun
Page 197 and 198: 1.5ca1 1.5ca1 Length of bearing are
Page 199 and 200: Vu = 9.04 kip T .u = 198.88 ft·kip
Page 201 and 202: Increase threaded rod diameter to 2
Page 203 and 204: Embedded Pipe and Torsion Plates De
Page 205 and 206: ⎝ ⎠ Check_Breakout_Torsion := "
Page 207 and 208: Lbreakout := tflex.plate + 2⋅1.5c
Page 209 and 210: ( ) .85 if fc < 4000psi β 1 f c .6
Page 211 and 212: REFERENCES 1. Cook, R.A., and Halco
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