Post-tensioning System of the Precast Network Arches of the West 7 TH Street Bridge. Courtney Holle, P.E.
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1 Post-tensioning System of the Precast Network Arches of the West 7 TH Street Bridge Courtney Holle, P.E.
2 West 7 th Street Bridge Photo Courtesy of Liam Frederick 2
3 Geometry 23-6 Arch Height 2 Deep Arch Rib and Tie at Midspan 9-7½ Floor Beam Spacing 3
4 Geometry Rib Hangers Tie Floor Beam 88 ft Overall Width 2 Lanes Each Direction 10.5 ft Sidewalk Width 4
5 Geometry 4-9 ¾ Hanger Spacing 4-6 Arch Width 5
6 Tie PT Ducts and Embeds Duct for Future Tendon Light Fixture Duct for Future Tendon Hanger Tube Floor Beam Tube 6
7 Construction Sequence Arch Cast Horizontally PT Stage I Arch Rotation PT Stage II Hanger Tensioning Arch Transport Hanging Floor Beams Place Panels Bridge In Service 7
8 Knuckle Region 2 Rib Tendons 4 Tie Tendons 2 Future PT Ducts 8
9 Design of PT Layout Arch Rotation Hanger Tensioning Bridge In Service 9
10 Rib Stiffening Element 10
11 Arches Cast on its Side 11
12 PT Stage I 0.77 f pu 0.39 f pu 12
13 Curves in Tie PT Duct 13
14 PT Stage I T6 T5 T2 Stressing Order,, T2, T4, T5, T6: 52ksi, 104ksi : 156ksi, : 208ksi T4 19 Strand Tendons 0.62in Diameter Strand 14
15 End Region 15
16 Arch Rotation 6 Lifting Frames 16
17 Arch Rotation Video 17
18 Instrumentation of the Arch University of Texas at Austin Vibrating Wire Gages 18
19 PT Stage II 0.39 f pu 0.77 f pu 19
20 PT Stage II T6 T4 Stressing Order T2, T4, T5, T6: 156ksi, 208ksi,: 52ksi (De-stressing) Shims Removed from Both Ends, : 104ksi T5 T2 20
21 De-stressing Shims T6 T5 T2 T4 21
22 De-stressing Shims Protection Rings (8 ¼ ID & 9 OD) De-stressing Shims (6 ID & 8 OD) 22
23 De-stressing Shims 23
24 De-stressing Rib Tendons 208ksi 208ksi 208ksi 6 Shims per tendon 3 Shims on each tendon end Rib Plan View 208ksi 1 Shim = Theoretical Elongation 26ksi ( of 0.77f pu ) 2 Shims = 3.25 Theoretical Elongation 52ksi ( of 0.77f pu ) 3 Shims = Theoretical Elongation 78ksi ( of 0.77f pu ) 6 Shims = 9.75 Theoretical Elongation 156ksi ( of 0.77f pu ) Leaving ~52ksi in Rib Tendons at the end of de-stressing (208ksi 156ksi =52ksi) 24
25 De-stressing Rib Tendons ~182ksi 208ksi 182ksi 208ksi 208ksi Rib Plan View 1 Shim ~ 26ksi 208ksi Arch Ram Extend Ram >1.625 Loosen Wedge Plate Remove 1 Shim Reset Wedge Plate 25
26 De-stressing Rib Tendons ~182ksi 182ksi ~156ksi 208ksi Rib Plan View 2 Shims ~ 52ksi 156ksi 208ksi Ram Extend Ram >3.25 Loosen Wedge Plate Remove 2 Shims Reset Wedge Plate 26
27 De-stressing Rib Tendons ~182ksi ~130ksi 182ksi 130ksi ~156ksi Rib Plan View 2 Shims ~ 52ksi 156ksi Ram Extend Ram >3.25 Loosen Wedge Plate Remove 2 Shims Reset Wedge Plate 27
28 De-stressing Rib Tendons ~130ksi 130ksi ~156ksi ~130ksi Rib Plan View 1 Shim ~ 26ksi 156ksi 130ksi Ram Extend Ram >1.625 Loosen Wedge Plate Remove 1 Shim Reset Wedge Plate 28
29 De-stressing Rib Tendons ~130ksi 104ksi ~104ksi 130ksi ~130ksi 1 Shim ~ 26ksi Rib Plan View 130ksi Ram Extend Ram >1.625 Loosen Wedge Plate Remove 1 Shim Reset Wedge Plate 29
30 De-stressing Rib Tendons 104ksi ~104ksi ~130ksi 78ksi 2 Shims ~ 52ksi Rib Plan View ~78ksi 130ksi Ram Extend Ram >3.25 Loosen Wedge Plate Remove 2 Shims Reset Wedge Plate 30
31 De-stressing Rib Tendons 104ksi 52ksi ~104ksi ~52ksi 78ksi 2 Shims ~ 52ksi Rib Plan View ~78ksi Ram Extend Ram >3.25 Loosen Wedge Plate Remove 2 Shims Reset Wedge Plate 31
32 De-stressing Rib Tendons 52ksi ~52ksi 78ksi 52ksi 1 Shim ~ 26ksi Rib Plan View ~78ksi ~52ksi Ram Extend Ram >1.625 Loosen Wedge Plate Remove 1 Shim Reset Wedge Plate 32
33 PT Stage II T6 T4 Stressing Order T2, T4, T5, T6: 156ksi, 208ksi,: 52ksi (De-stressing) Shims Removed from Both Ends, : 104ksi T5 T2 33
34 Elongations Arch 1 Tie tendons were stressed from both sides 0.25 elongation on 2 nd side Arches 2 thru 12 Stressed from one side only Tie Elongations Stage II stressing elongations within 6% of theoretical Rib Elongations Stage I stressing (from 104ksi to 208ksi) elongations averaged 9% over theoretical 34
35 Rib Grouting Masterflow 1341 Grout For vertical duct placement Rib tendons grouted from both ends grouted up to the rise of the arch 35
36 Tie Grouting Tie tendons grouted from one end 36
37 Construction Sequence Arch Cast Horizontally PT Stage I Arch Rotation PT Stage II Hanger Tensioning Arch Transport Hanging Floor Beams Place Panels Bridge In Service 37
38 Hanger Tensioning 38
39 Arch Transportation 39
40 Arch Transportation Video 40
41 Arch on Columns 41
42 Existing Structure Demolition 42
43 Bridge Construction 43
44 Floor Beam to Arch Connection 44
45 Acknowledgements Dean Van Landuyt, P.E. Texas Department of Transportation Zuming Xia, Ph.D, P.E. VSL/Structural Technologies 45
46 West 7 th Street Bridge Photo Courtesy of Liam Frederick 46
47 Arch Transport Video 47
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