Design Guidelines and Detailing 2019 Update Related to ......Update on the design aspect and detail...
Transcript of Design Guidelines and Detailing 2019 Update Related to ......Update on the design aspect and detail...
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Design Guidelines and Detailing Update Related to Post-Tensioning
and Segmental Bridges
Teddy S. Theryo, P.E.
FDOT Structures Design Office
2019
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Background Behind the Flexible Filler PT Policy
❖ PT Grout - Crisis of Confidence
❖ An opportunity for Improvement
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THE FDOT STUDY TOUR MEMBERS AT PROJECT SITE IN FRANCE (October 16, 2013)
Background Behind the Flexible Filler PT Policy
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Learning Objectives
❖Status of FDOT Flexible Filler PT tendons
❖Flexible Filler project implementation in the state of Florida
❖Update on the design aspect and detail requirements for post-tensioned and segmental concrete bridges
❖Update on Structures Design Guidelines related to post-tensioned and segmental bridge design
❖Update on Structures Detailing Manual related to post-tensioned and segmental bridge detailing
❖Update on tendon filler injection mock-up test requirements
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Presentation Outline
1. Introduction
2. General Requirements
3. Superstructures
4. PT Spliced Girder Bridge
5. PT Tendon Mock-up Test
6. Closing
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Introduction
Major Changes in PolicyImplement Flexible Filler as PT Tendons corrosion protection for all tendons, except PT tendons in the deck, such as cantilever tendons, transverse tendons, slab tendons with maximum 2’-0” drape.
Tendon Replaceability is one of the major factors in changing the Policy toward flexible filler.
Focus of this PresentationStructures Design Guidelines and Structures Detailing Manual updates in implementing the Policy Changes in PT bridges since 2016Reference: Structures Manual – January 2019
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Introduction (cont.)Flexible Filler/ Replaceable Tendons - Status of Post-tensioned and Segmental Bridges in Florida April 2014: Revision to FDOT Policy for Post-Tensioned bridges was posted (Structures
Design Bulletin 14-06)
January and May 2015: Updated on the Revised Policy were posted (Structures Design Bulletin 15-01 & 15-03)
Since May 2015 Structure Design Office continue updating Structure Design Guidelines related Post-tensioned and segmental bridges
The Policy for PT Bridges was effectively implemented since January 1, 2016.
Projects implementation: two flexible projects have been completed, and several other major projects are under construction
Flexible filler injection Training in Tallahassee, sponsored by FDOT, ASBI & PTI (1st
training – May 2017, 2nd training – August 2018, 3rd training – August 2019).
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IntroductionProject Implementation
Project: Wildwood I-75 Turnpike Interchange Subject: Post-tensioned straddle pier cap with flexible fillerStatus: Completed constructionProject completion: Open to traffic 2018
Photo Courtesy of VStructural
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IntroductionProject Implementation
Project: I-295 Express in JacksonvilleSubject: Three straddle pier caps are post-tensioned with flexible filler tendonsStatus: Completed constructionProject completion: Open to traffic May 2019
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IntroductionProject Implementation
Project: Wekiva – Section 6Subject: Three 3 span CIP balanced cantilever bridges, post-tensioned tendons with flexible filler and grout Status: Under constructionExpected project Completion: Spring 2021
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IntroductionProject ImplementationProject: Selmon Expressway – West Extension (THEA Project)Subject: Post-tensioned Precast segmental superstructure, including some pier columns. PT tendons are flexible in combination with grout fillersStatus: Under constructionExpected completion: Fall 2020
Rendering courtesy of Kiewit
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IntroductionProject ImplementationProject: I-395 Project in MiamiSubject: Post-tensioned Precast Segmental Structures (Arches and box girders) Status: Under constructionExpected completion: 2022
I-395 Project Renderings - Courtesy of Connecting Miami (Archer Western De Moya Joint Venture)
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General Requirements
Corrosion and Tendon Redundancy
How is this Strategy # 5 applied to flexible filler?
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General Requirements
Tendon Replaceability/Redundancy
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General Requirements
Tendon Replaceability
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Maintenance / stressing spaces at Abutment (typical for bridges in Europe)
General Requirement
Abutment
End Diaphragm
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General Requirements
Tendon Replaceability
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General Requirements
Tendon Replaceability
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General Requirements
Tendon Replaceability
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General RequirementsTendon Replaceability
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Tendon Duct Geometry
General Requirements
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Superstructure
Background for switching to Diabolo Form
Conventional detail with bonded rigid steel pipe
Rigid steel pipe pulled out due to failed tendon
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SuperstructureBackground for switching to Diabolo Form
Diabolo was prohibited by Spec. 462. The winner of D/B Team for SR 826/SR 836 Interchange in Miami proposed to use Diabolos as Technical Innovation. FDOT would only accept the Diabolos provided two tests to be conducted:• Wear test per ETAG 13• Flexibility test per ETAG 13Both test results were satisfactory and the proposal was accepted. Diabolo Static Load Testing
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SuperstructureBackground for switching to Diabolo Form
Diabolo Static and Wear Testing
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Deviator
Diabolos form
Superstructure
External Tendon
Typical diabolos form for segmental bridges in Europe
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SuperstructureAnother form of diabolos (Germany)
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Superstructure
Rendering and diabolo basic geometry per FHWA Research Project, Draft Report “Replaceable Grouted External Pos-tensioned Tendon” by Parsons Brinckerhoff (WSP), April 2017.
Background for switching to Diabolo Form
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Superstructure
Advantages with Adopting Diabolos Form
1. Ease of tendon installation2. Ease of external tendons replacement3. Allow more tolerances in 3D tendon geometry control
between two points, e.g. from deviator to diaphragm
Background for switching to Diabolo Form
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Superstructure
SDG 1.11.4 (E)
Background for switching to Diabolo Form
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Superstructure
FDOT DiaboloForm Standard
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SuperstructureFDOT Diabolo Form Standard
Internal tendon
External tendon
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SuperstructureFDOT Diabolo Form Standard
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Superstructure
FDOT Diabolo Form Standard
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Superstructure
FDOT Diabolo Form Standard
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SuperstructureFDOT Diabolo Form Standard
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Superstructure
Duct Spacing
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SuperstructureDuct Spacing
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SuperstructureDuct Spacing
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Substructure
Duct Spacing
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Superstructure
• Shear Capacity Limit
• Support hinge locations
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Superstructure• External PT
unsupported length
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Superstructure
Based on Study: “Review of AASHTO LRFD Bridge Design Specifications and ACI-318 Unbonded PT Provisions for FDOT Implementation” by Parsons Brinckerhoff (WSP), Nov. 17, 2015
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Superstructure
Wide Beam Member
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Superstructure
Wide Beam Member
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Superstructure
On going research on Shear and Flexural strength of combined unbonded and bonded tendons
1. NCHRP 12-118: “Design Construction Specifications for Bonded and Unbonded Post-Tensioned Concrete Bridge Element”. Expected completion: 2021
2. FDOT Research projects(a.) “Flexural Capacity of Concrete Elements with Unbonded and Bonded
Presstressing”FDOT Contract No. BD31-977-93
(b.) “Shear Behavior of Webs Post-Tensioned with Tendons Containing Flexible Filler”
FDOT Contract No. BDV31-977-71
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PT Spliced Girder Bridge
Shear Detailing in Thin Web - SDG Figure 4.5.1-1
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PT Spliced Girder Bridge
Tendon Replaceability
Staggered Tendon Overlap
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PT Spliced Girder Bridge
Tendon Replaceability
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PT Spliced Girder Bridge
External Tendon OptionSDM 23.7-4 & 23.7-6
Elevation
Tendon Vertical Layout
Section – Plan View
A
A
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PT Tendon Mock-up Test
PT mock-up test required under Standard Specification 462-7.4 Filler Injection
Required full scale mock-ups both for flexible and grout filler tendons associated with PT system components, including filler materials proposed for the project (see Index 21800 Series and its IDS for guidance in preparing mock-up test plans)
Submit a Report of the test and findings
Repeat mock-up test if required by the Engineer
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PT Tendon Mock-up Test
The objectives of mock-up test
• To demonstrate that the proposed PT system, filler material, equipment used and injection method will be able to fully fill the ducts from end to end
• Opportunity for the contractor to train the workers• Opportunity to improve the quality of their products• For FDOT to provide opportunity to observe the
results, lessons learned and improve our specifications
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PT Tendon Mock-up TestProject: Wildwood – I-75 InterchangeFlexible filer: Fill Flex 100 (Trenton)Date: July 12, 2018
Photos courtesy of VStructural
Inlet port
Heated holding tank
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PT Tendon Mock-up TestProject: Wildwood I-75 Outlet port
Vacuum device
Photos Courtesy of VStructural
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PT Tendon Mock-up Test
Project: Wildwood I-75
Void
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PT Tendon Mock-up TestProject: Wekiva Section 6 BridgeFlexible filler: RENOLIN CL 4 RO (Fuchs Lubricants, Co)Date injected: April 22, 2019
Mock-up: two span continuous with draped tendon 2 @ 100’ = 200’ total length.
Wax leaking at inlet (top) and outlet (cap) ports connections
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Curtesy of Superior ConstructionPT Tendon Mock-up Test
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PT Tendon Mock-up Test
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PT Tendon Mock-up Test
Project: Wekiva Section 6
Void
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Closing
Thank you for your attention
Any questions?