puentes Postensado.pdf
of 39
-
Upload
freddy-candiotti -
Category
Documents
-
view
230 -
download
1
Transcript of puentes Postensado.pdf
-
8/10/2019 puentes Postensado.pdf
1/39
-
8/10/2019 puentes Postensado.pdf
2/39
2
Outline
Capabilities and Benefits
Design Examples Pretensioned (Threaded-Rod) Alternative
Post-Tensioned Alternative Future Innovations
-
8/10/2019 puentes Postensado.pdf
3/39
3
Up to 70 strands
WWR Long span capability Can be P/T
Super Girder
-
8/10/2019 puentes Postensado.pdf
4/39
CA Wide Flange
4Pretensioned Post Tensioned
-
8/10/2019 puentes Postensado.pdf
5/39
WF Bottom
Flange #5 Stirrup
WWR
3 5/8 diameterducts
54 Straight strand
14 Harped strand
5
-
8/10/2019 puentes Postensado.pdf
6/39
-
8/10/2019 puentes Postensado.pdf
7/39
Non-Composite Section
7
-
8/10/2019 puentes Postensado.pdf
8/39
Composite Section
8
Girder Spacing = 10 ft
-
8/10/2019 puentes Postensado.pdf
9/39
WF Span Capabilities 0.6 Strand
9
Simple SpanGirder Spacing = 10 ft
045.0=S D
-
8/10/2019 puentes Postensado.pdf
10/39
-
8/10/2019 puentes Postensado.pdf
11/39
-
8/10/2019 puentes Postensado.pdf
12/39
-
8/10/2019 puentes Postensado.pdf
13/39
13
Design Examples
-
8/10/2019 puentes Postensado.pdf
14/39
WF Girder Alternatives
Threaded Rod Alternative:
Pretensioned Girders Continuous for deck weight
Post Tensioned Alternative 2-stage P/T Pretensioned for girder self weight
14
-
8/10/2019 puentes Postensado.pdf
15/39
15
Threaded Rod Continuity
-
8/10/2019 puentes Postensado.pdf
16/39
16
Threaded Rod Continuity
-
8/10/2019 puentes Postensado.pdf
17/39
17
Threaded Rod Continuity
-
8/10/2019 puentes Postensado.pdf
18/39
-
8/10/2019 puentes Postensado.pdf
19/39
19
Post-tensioned Alternative
-
8/10/2019 puentes Postensado.pdf
20/39
20
Analysis Considerations
Elastic behavior no redistribution
Lump-sum losses Deflections superimposed from each stage
Sag soffit profile not allowed
CT Bridge used for live load and P/T
-
8/10/2019 puentes Postensado.pdf
21/39
21
Threaded Rod Alternative
-
8/10/2019 puentes Postensado.pdf
22/39
22
P/T Alternative Girder Details
-
8/10/2019 puentes Postensado.pdf
23/39
23
Girder Post-tensioning
-
8/10/2019 puentes Postensado.pdf
24/39
24
Midspan Deflections (in)
Girder + pretension 0.4 in.
Stage 1 P/T 2.5 in. Deck weight -2.6 in.
Stage 2 P/T 0.5 in. SDL -0.5 in.
Total 0.5 in.Note: Positive is upward
-
8/10/2019 puentes Postensado.pdf
25/39
25
Girder Shear
-
8/10/2019 puentes Postensado.pdf
26/39
26
MCFT Shear Capacity
vvc pscn d b f V V V V ++= 25.0
-
8/10/2019 puentes Postensado.pdf
27/39
27
Girder Shear NCHRP 579
-
8/10/2019 puentes Postensado.pdf
28/39
28
Abutments
Post-tensioned Alternative Threaded Rod Alternative
-
8/10/2019 puentes Postensado.pdf
29/39
29
Bent Cap
-
8/10/2019 puentes Postensado.pdf
30/39
30
-
8/10/2019 puentes Postensado.pdf
31/39
-
8/10/2019 puentes Postensado.pdf
32/39
-
8/10/2019 puentes Postensado.pdf
33/39
-
8/10/2019 puentes Postensado.pdf
34/39
Future Innovations
0.7 in. Strand
Full-depth precast deckpanels
Railroad applications
Prefabricated substructureconnections
34
-
8/10/2019 puentes Postensado.pdf
35/39
Pacific Street Bridge over I-680
-
8/10/2019 puentes Postensado.pdf
36/39
36
10 NU900 girders spaced 10 ft -8 in 30-0.7 in straight strands spaced 2 in horizontally and 2.5 in
vertically Two spans 98 ft each with TR continuity Opened to traffic in August 2008
D/S = 0.038
Omaha, NE
-
8/10/2019 puentes Postensado.pdf
37/39
37
-
8/10/2019 puentes Postensado.pdf
38/39
38
-
8/10/2019 puentes Postensado.pdf
39/39
39
Acknowledgements
