The session objective is to present state-of-the-art and emerging methodologies for the strength or serviceability evaluation of signature concrete bridges. Bridge designers, inspectors, owners, leading industry experts, students, and academicians should attend the session. The potential list of topics includes, but is not limited to: load testing at or beyond service, use of load testing for load rating or maintenance, advanced numerical or computational analysis, structural versus element rating, determination of structure specific reliability indices, use of continuous monitoring for detecting anomalies, novel inspection techniques.
(1) Describe state-of-the-art and emerging technologies for the strength or serviceability evaluation of signature concrete bridges through load-testing methods;
(2) Describe state-of-the-art and emerging technologies for the strength or serviceability evaluation of signature concrete bridges through advanced numerical or computational analysis;
(3) Identify key performance indicators that specifically apply to signature concrete bridges;
(4) Identify advanced load testing methods that can be used for signature concrete bridge evaluation.
Max capacity for a live session is 1,000. This session will be available on demand, during convention week, within 24 hours after this session takes place.
This session has been approved by AIA and ICC for 2 PDHs (0.2 CEUs). Please note: You must attend the live session for the entire duration to receive credit. On-demand sessions do not qualify for PDH/CEU credit.
Linn Cove Viaduct - Maintenance Required Since Construction
Presented By: Rich Pakhchanian
Affiliation: Federal Highway Administration, Eastern Federal La
Description: The Linn Cove Viaduct was one of the first segmental bridges constructed in the United States with a complex S-and-one-half curvature alignment. The bridge consists of pre-casted post-tensioned box girder segments that where progressively erected using top-down construction. This construction method was utilized to minimize the environmental impact at the site. The bridge is currently over 30 years old and required minimal maintenance. However, due to its complex geometry some maintenance has been needed. This session will review the bridge and the maintenance that has been done on the structure.
Shear Strengthening of Sunshine Skyway Bridge Trestle Spans Beams with CFRP
Presented By: Atiq Alvi
Affiliation: T.Y. Lin International
Description: The Sunshine Skyway Bridge is recognized as the State of Florida’s “flagship bridge.” The goal of the Florida Department of Transportation (FDOT) and specifically the FDOT entity that maintains the Skyway Bridge, the District 1&7 Structures Maintenance Office (DSMO) is to extend the life of this bridge to 100 years. Cracks in the Trestle Span beams have been noted since the 1990s. In 2005, the DSMO initiated an in-depth study to determine the cause of cracking and recommend a repair procedure. Upon completion, a committee of FDOT staff including DSMO and State Materials Office (SMO), along with consultants and experts, determined criteria to address these cracks. The repairs included crack injection, penetrant sealer, and carbon fiber reinforced polymer (CFRP) wrap installation at the beam-ends. FDOT addressed the repairs in three phases. The first repair project was in 2009, the second in 2013, and the third and final project started in 2019.
Condition Evaluation and Monitoring for Management of Post-tensioned Segmental Concrete Bridges
Presented By: Michael Brown
Affiliation: WSP USA
Description: Post-tensioned concrete has been used to successfully construct long-span highway bridges for decades. These elegant structures are structurally efficient and have the potential to serve long service lives in harsh environments. Challenges to successful management of such structures are their relative complexity and the presence of important structural components that may be difficult to inspect in service. This presentation will discuss a range of techniques have been employed to investigate the in-service condition and structural performance of cantilever segmental post-tensioned concrete bridges, with and without stay cables, for the purpose of determining their prognosis and prescribing the most appropriate repairs and preventative treatments to ensure that long service lives may be achieved.
A Case Study - The Marquette Interchange Pier TS7
Presented By: Tony Shkurti
Affiliation: HBTB Corp
Description: The Marquette Interchange, a highway system since the 1960s, was replaced with new structures and roadways. The interchange of I-94, I-794 and I-43 is the cornerstone of the southeastern Wisconsin freeway system. The $810 million project included a 5-level system interchange, 5 miles of interstate, 28 ramps, 56 bridges totaling 2.1 million square feet of bridge deck and 5 miles of retaining wall. Construction was phased so that traffic can flow through the interchange throughout the entire four-year reconstruction process. Extensive mitigation and public information campaigns were carried out to provide transportation choices and inform motorists of available routes during construction. HNTB, as part of Marquette Transportation Partners, designed the Marquette Interchange Reconstruction. The project was successfully delivered on time and to client satisfaction. During a routine, mandatory bi-annual inspection, it was observed by the inspectors that there were what seemed to be issues with the behavior of one single pier out of 199, Pier TS7. Extensive, unexpected cracking was appearing in the concrete pier cap. Tony will provide an overview of the project, the problems encountered with Pier TS7 and an overview of the investigation, navigating through the most appropriate solution and the reconstruction process.
GCRTA Special Bridge Inspection: Instrumentation, 3D FEM Calibration, and Analysis of an In-Service LRT Bridge
Presented By: Kent Dickens
Description: The RTA-NSFRONT-130 bridge over Norfolk Southern Railroad and Front Avenue, is a curved 5-span continuous, precast, post-tensioned, segmental, single cell box girder superstructure, which carries light rail traffic on continuously welded direct-fixation track for the Greater Cleveland Regional Transit Authority (GCRTA). The bridge exhibits signs of distress consistent with the effects from rail-structure interaction (RSI). HDR inspected, instrumented (in partnership with Purdue University), and performed an analysis of the structure. The data from the instrumentation program, which included thermal, strain, and displacement sensors combined with temperature recordings, allowed for the calibration of the input parameters for the non-linear hysteretic springs which are at the heart of the RSI analysis. The calibrated model was then used to determine the as-built state of stress of the structure and the magnitude of the effects of rail-structure interaction.
Use of Advanced Bridge Evaluation Techniques for the Blatnik Bridge
Presented By: Andrew Foden
Affiliation: WSP USA
Description: The John A. Blatnik Bridge spans the St. Louis River between Duluth, Minnesota and Superior Wisconsin. Significant deterioration has developed in several areas of the bridge causing the Minnesota and Wisconsin Departments of Transportation to implement an aggressive approach to maintain the condition of the bridge. The Minnesota Department of Transportation undertook a series of projects to identify investments necessary to efficiently and effectively maintain the crossing. This presentation will discuss the asset management framework developed and the results of the Technical Analysis project, which collected information to fill the knowledge gaps in structural condition needed to analyze the action scenarios presented in the overarching Bridge Management Study. The detailed condition information was collected for all bridge components using a variety of techniques including material testing, non-destructive testing, load testing, and visual inspection. The results of the condition information collected, and the methodologies used will be presented.