guidelines for accelerated bridge construction using precastprestressed concrete components

8/11/2019 Guidelines for Accelerated Bridge Construction Using PrecastPrestressed Concrete Components

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PCMAC

Paul C. Chung, MS, PE

Raymond W. Wolfe, PhD, PE

Jason Q. Fang, PhD, PE

ABC- Advisory Council

California Department of Transportation

CaltransCaltrans

Accelerated Bridge ConstructionAccelerated Bridge Construction(ABC)(ABC)

InitiativeInitiative


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One Mission One Vision

Enhance Mobility across California

Need for Accelerated Project Delivery ABC works towards reducing roadway delayimpacts on the traveling public

ABC deliver project early, provide speedycapital investments

Minimize construction and reduce safety-related issues, environmental impacts

Improve constructability, product quality

and performance.


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The Bigger Picture-

Caltrans Strategic Plan ABC is an element of Accelerated Project

Delivery (APD)

APD encompasses all aspects of project

delivery, including ABC Benefits of APD: lead to expedited capital

improvement (commerce, regional business

& services, traveling public)= expeditiously

Stimulate & Improve the states economy


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Accelerated Project Delivery

NCHRP 20-73 Accelerating Transportation

Project and Program Delivery: Conception toCompletion

Charlie Fielder, District 1 Director representing the

Department

Ongoing coordination, discussions, and efforts

with HQ and Districts develop and implementaccelerated project delivery


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National Spotlight

2006 ABC Workshop, Reno, NV Guidelines for Accelerated Bridge Construction using

Precast/Prestressed Concrete Components, PCI NortheastBridge Technical Committee (2006)

Seismic ABC Meeting at 2007 TRB Annual Meeting

2007 SABC meeting in San Diego

2008 FHWA ABC Conference in Baltimore, MD

2008 TRB SABC Collaboration Meetings

UDOT ABC Standards Workshop report (anticipated April2008)

FHWA/WashDOT ABC Workshop (September 2008)

FHWA Connections Manual (2008)


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ABC XYZ?

Technical

Prefabricating Bridge Elements and Systems

(PBES) and erecting on-site Precast concrete super- and sub-structure- Majorityof PBES in California

Steel superstructure

Steel & FRP superstructure

Segmental construction methods (could be C.I.P.)

Launch or Roll-in (SPMT) girders/superstructures

Contract and Construction

Double shifts

Discentive and Incentives


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California Issues

Costs of ABC use

Construction and material costs

Projects programmed before ABC tools considered

Industry reluctance- CIP the preferred method(typically not a speedy operation)

Seismic risk mitigation Performance objectives risk


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California ABC Strategic Plan

Engineering Services: ABC- Advisory Council

Pursues further widespread ABC practice for

future standard bridge projects1. Lessons Learned Report and Survey

2. ABC Selection Criteria

3. Industry Engagement

4. Construction Specifications Development

5. Technical Research and Development

6. Project Implementation- Pilot Program


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Document Lessons Learned

ABC Projects in California in last three years-(completed in less than ~5 months)

Identify project goals Define ABC techniques employed

Quantify successes/challenges Determine effectiveness

Establish ABC Techniques Selection Guides

Recommend improvements for future projectsand research needs

Living document


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Rte99/120 Separation

PC/PS Box Beams, Post-Tensioned w/ Inter Cap


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Reduce construction time for abutments to allow quicker girderplacements

Total 12 bridges completed in 3 months

I-40 Marble Wash Bridge Replace

Replace w/ Precast Girders Marble Wash completed in 28 days


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ABC Selection Criteria-

Reference- FHWA: PBES Framework for Decision Making

http://www.fhwa.dot.gov/bridge/prefab/framework.cfm

Utah DOT

Quantify Costs/Benefits

Impact on air quality due to increased vehicleemissions, quality of life due to personal time delays,

Untimely business service for workforce, supplier, andcustomers

Incur significant costs to traveling public and regionbusinesses ~tens of thousands of dollars per weekday


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Benefits- Reduces traffic delays, hazards, andprovides infrastructure improvement at a fast pace.

Generate cost model for impact time duration (CIT)-

$/day1. Facility: Local street, Major Artery/Highway, LandmarkBridges

o Percentage of traffic effected

2. Type of Impact: Environmental, Traffic Delay, and/orCapacity Improve/Restore

3. Time Duration of Impact: # of days (week or weekend)

Estimate CTI ($/day) for Conventional Construction (CC)

Estimate CTI ($/day) for ABC

Calculate Economic Savings-ECS= CTI (CC) CTI (ABC)


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Balance Risks/Benefits State pays construction premium in advance, cost

savings from ABC apply directly to travelingpublic & regional economy.

Economical benefits offset construction costs

ABC Selection for Projects

Partner with project stakeholders, traffic

officials, local agencies

Identify needs, benefits, costs, and risksassociated with ABC

Work with contractors, engineers - consider

whether available ABC techniques appropriate


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Industry Engagement Caltrans to sponsor workshop with

consulting engineers, fabricators, erectors,trucking, and general contractors

a. Constructability

shapes, geometry, curvature, tolerancesb. Picking and transporting limits

c. New precast component & details solutions

d. New material applications Work with Industry to improve

construction cost competitiveness


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Contract Development

Reflect Delay/Time Costs in Bid Process

Develop use of Incentive/Disincentive

contract clause A+B contract practice


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Technical Development

Seismic Issues- future research

NCHRP- TRB, MCEER Research

Caltrans STR & others

A number of research problem topics prioritized

Precast bent cap to column connections

Precast girder to bent cap connections

Precast Segmental Columns Hybrid Connections Other Industries

Grouted splice sleeve couplers


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Seismic Research- past Spliced Girder Research- UCSD Testing

Fully reversed horizontal displacement cycles until target

ductilities reached.

T h i l D l


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Seismic Research- pastSpliced Girder Research

SuperstructurePerformance

Bent cap withstands plastic

moment induced bycolumn

Girders remain

Essentially Elastic withsmall cracks

Post-tensioned bent cap

clamps girders together


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Seismic Research- current

(a.) Bridge Elevation

(c.) Section of cap between girders

Precast Bent Connection Tests- U. Washington

NCHRP 12-74 (UCSD) studying jointed construction

Accelerated Column Construction Tests- U. Washington MCEER ABC research

UCSD-Iowa State Inverted-Tee Bent Cap

(b.) Typical Section


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Design & Construction Specifications Design Specifications & Details- findings from

research Areas of LRFD Bridge Design Specifications needs ABC

related modifications

Review FHWA Connection Manual- Develop seismic

standards Fast cure and setting concrete pour, SCC

Assess long-term connection durability & maintainability-install monitoring devices

Develop inspection practices non-destructive evaluation methods & tools

Investigate potential corrosion issues including unbonded

tendon inspection and replacement

P j I l i


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Project Implementation-

Pilot Program Establish a pool of candidate projects for ABC-

Select projects based on ABC Selection Criteria-

partner with local and traffic officials and stakeholders

Up-to-date technical research and developments-application and implementation

Engage w/ Contractor during design- Bridge Forum

Partner w/ Construction and Contracts Office (OE)-Develop contracts and construction specifications

ABC P j C did


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ABC Project Candidate

Identify candidate at PSR and APS stage I605/I10 Interchange Viaduct- Advanced PlanningAlternative

Southbound I-605 to East I-10 connector, in BaldwinPark, Los Angeles County

Replace existing on-grade connector

Existing traffic safety concern- frequent accidents Proposed bridge crosses I-605 & I-10- curved

alignment

30 feet above I-605 & 75 feet above I-10

Total bridge length= 3300 ft

Bridge width= 27 ft (single lane)

ABC P j C did


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I605/I10 Interchange Viaduct I-605 & I-10 heavily used daily- heavy traffic

congestion during commute hours

Current HOV Widen on I-10- construction

complete in 2011

ABC proposed Minimize construction impact to existing traffic

Accelerate traffic safety improvement Structure Type- ABC Alternative

Precast Segmental Balanced Cantilever

construction- Single-Cell Box Girder

ABC P j t C did t


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I605/I10 Interchange Viaduct

16-spans, span lengths = 210- 270 ft

A C j C did


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I605/I10 Viaduct- proposed construction stage

ABC On LineABC On Line


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ABC On-LineABC On-Line

http://www.dot.ca.gov/hq/esc/Structure_Design/accel_bridge_construction/

ABC O LiABC O Li


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ABC On-LineABC On-Line

FHWA Seismic ABC Workshop Report Caltrans ABC Strategic Plan

ABC Lessons Learned Report- CA Applications


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Concluding Remarks ABC critical to meet AASHTO SCOBS Grand

Challenge #3:Accelerating Bridge Construction Planning essential to proper application

National and regional coordination essentialand exists

Successful implementation requires

innovation Engage partners to succeed!

guidelines for accelerated bridge construction using precastprestressed concrete components

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