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Project Details
STATUS

Completed

START DATE

12/01/11

END DATE

11/27/15

RESEARCH CENTERS InTrans, CTRE
SPONSORS

FHWA Highways for LIFE (HfL)

Researchers
Principal Investigator
Omar Smadi

Director, CTRE

Principal Investigator
Neal Hawkins

Associate Director, InTrans

Co-Principal Investigator
Shauna Hallmark

Director, InTrans

Co-Principal Investigator
Skylar Knickerbocker

Research Engineer, REACTOR

About the research

Horizontal curves make up a small percentage of total road miles, yet account for one-quarter of all highway fatalities. The majority of crashes on curves involve lane departures. The Sequential Dynamic Curve Warning System consists of a series of solar-powered, LED-enhanced BlinkerSigns (a Curve Warning BlinkerSign and an array of Chevron BlinkerSigns) that are installed throughout a curve. Approaching vehicles, sensed by radar or other ITS device, trigger the controller that wirelessly activates the LED signs to flash sequentially through the curve to warn speeding drivers to slow down. The field study will evaluate the effectiveness of the technology in reducing vehicle speeds and in reducing the frequency and/or the severity of curve-related crashes. Participating State DOTs include Iowa, Missouri, Texas, Washington, and Wisconsin.

 

Project Details
STATUS

Completed

PROJECT NUMBER

11-425, SPR 90-00-RB12-012

START DATE

11/01/11

END DATE

06/28/13

FOCUS AREAS

Infrastructure

RESEARCH CENTERS InTrans, BEC, CTRE
SPONSORS

FHWA Highways for LIFE (HfL)
Iowa Department of Transportation

Researchers
Principal Investigator
Sri Sritharan

Faculty Affiliate

Co-Principal Investigator
Sriram Aaleti
Co-Principal Investigator
Terry Wipf

Faculty Affiliate

About the research

As a part of an innovation project funded by the Federal Highway Administration (FHWA) Highways for LIFE program, a full-depth precast, ultra-high-performance concrete (UHPC) waffle deck panel and appropriate connections suitable for field implementation of waffle decks were developed.

Following a successful full-scale validation test on a unit consisting of two panels and there different types of connections under laboratory conditions, the waffle deck was successfully installed on a replacement bridge in Wapello County, Iowa. The subsequent load testing confirmed the desirable performance of the UHPC waffle deck bridge.

Using the lessons from the completed project and outcomes from a series of simple and detailed finite element analyses of waffle decks, this report was developed to serve as a guide for broadening the design and installation of the UHPC waffle deck panel in new and existing bridges.

Following an introduction to UHPC and waffle deck panels and a summary of completed work, the report presents information on: design of waffle deck, design of connections, redecking using waffle deck panels, and guidance on precast fabrication, construction, and installation of UHPC waffle deck panels.

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