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Evaluating existing culverts for load capacity allowing for soil structure interaction

Description: This study explores culvert load rating practices and procedures as applied to the Texas Department of Transportation's (TxDOT's) archive of 1477 culvert designs and their inventory of more than 13,000 in-service reinforced concrete box culverts. The problem is that when older culverts are load-rated based on current AASHTO policy, many competent, serviceable culverts are shown to be deficient, requiring load posting, retrofit or replacement. A disconnect exists between culvert structural analysis practices and actual culvert performance. To address this challenge, the research focused on development of a clear, repeatable and reliable procedure for TxDOT engineers and their consultants to use for load rating culverts in the TxDOT roadway system. Articulated in TxDOT's Culvert Rating Guide, the new load rating procedure uses three increasingly-sophisticated analysis approaches, ranging from a direct stiffness frame model to a production-oriented finite element model which accounts for soil-structure interaction. Validation of the Culvert Rating Guide involved three major tasks. First, the researchers load-rated a statistically representative sample of 100 of TxDOT's culvert designs. Second, a parametric study was performed to evaluate six independent variables associated with culvert load rating. Third, instrumented load tests on three in-service culverts were conducted to compare measured demands with predicted values. This work showed that the analytical methods in the Culvert Rating Guide produce conservative load ratings yet still allow for reduction in excess over-conservatism in the load rating process.
Date: December 2010
Creator: Lawson, William D.; Wood, Timothy A.; Newhouse, Charles D. & Jayawickrama, Priyantha W.
Item Type: Report

Hydraulic capacity of type-h inlets: final report

Description: Type H Inlets are frequently used by the Texas Department of Transportation as median drains for divided highways. Despite frequent use, engineers do not have adequate design information to mathematically describe the hydraulic performance of these structures. Typically, it has been assumed that IL-H-G and IL-H-L function essentially the same as roadway grates or curb inlets, but there is no basis for that assumption. Type-H drop inlets were investigated using a database from literature-reported experiments for similar inlets and physical model studies conducted at Texas Tech University (TTU). SWMM was investigated as a predictive tool by comparison to the TTU experimental results. The SWMM model was subject to very minimal calibration yet predicted performance reasonably well, especially when full inlet capture may occur. Examples of performance prediction using HEC-22, the power-law model and SWMM are presented to provide some guidance for Type-H inlet design.
Date: December 2010
Creator: Cleveland, Theodore G.; Rainwater, Kenneth A.; Smirnov, Sergey; Barnes, Wade; DaCosta, Larissa; Basnet, Bijay et al.
Item Type: Report

Laboratory Evaluation of Constructibility Issues with Surface Treatment Binder

Description: This report discusses a study related to the use of emulsified asphalt (EA) as a binder for sealing roads after construction. Due to the number complex variables that affect EAs, this research is meant to help TxDOT personnel better predict which EA will be most effective and bond most quickly to allow roads to open for traffic.
Date: October 2011
Creator: Senadheera, Sanjaya Priyantha, 1959-; Prozzi, Jorge Alberto; Smit, Andre; Bannerjee, Ambarish; Tubb, Andrew & Niu, Lei
Item Type: Report

Pavement Repair Guidelines for Longitudinal Joints

Description: This report provides information on the implementations of Project 5-5444-01, "Pilot Implementation of Pavement Repair Guidelines for Longitudinal Cracks and joints," applies the lessons and recommendations from the previous Texas Department of Transportation (TxDOT) funded Center for Transportation Research (CTR) Research Project 0-5444, "Rehabilitation Procedures for Longitudinal Cracks and Joints Separation in Concrete Pavement,: which investigated the causes and repairs of longitudinal joint separations and faulting.
Date: November 2010
Creator: Fowler, David W.; Whitney, David & Ha, Soojun
Item Type: Report

Pavement Repair Guidelines for Longitudinal Joints

Description: This report provides information on the implementations of Project 5-5444-01, "Pilot Implementation of Pavement Repair Guidelines for Longitudinal Cracks and joints," applies the lessons and recommendations from the previous Texas Department of Transportation (TxDOT) funded Center for Transportation Research (CTR) Research Project 0-5444, "Rehabilitation Procedures for Longitudinal Cracks and Joints Separation in Concrete Pavement,: which investigated the causes and repairs of longitudinal joint separations and faulting.
Date: November 2010
Creator: Fowler, David W.; Whitney, David & Ha, Soojun
Item Type: Report

Use of dowel bars at longitudinal construction joints

Description: Report discussing the primary objective of this research project, whcih was to develop rational guidelines on the use of dowel bars in longitudinal construction joints (LCJs) for better-performing concrete pavements without potential longitudinal cracking problems.
Date: August 2011
Creator: Ha, Soojun; Cobos, Luis; Choi, Cheol Choi; Yeon, Jungheum; Cho, Byounghooi & Won, Moon C.
Item Type: Report