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Structural Monitoring of the World’s First Precast Network Arch Bridge during Construction


2014 ... Hossein Yousefpour, Todd Helwig, Oguzhan Bayrak · This report provides an overview of a monitoring study on the West 7th Street Bridge in Ft Worth, Texas, that was carried out by The University of Texas at Austin (UT). The West 7th Street Bridge was designed by the Texas Department of Transportation (TxDOT) and is believed

5253-03-1 [CTR] ... FHWA/TX-14/5-5253-03-1

Full-text Link:
12 MB

Improved Cross Frame Details for Steel Bridges


2014 ... Anthony Battistini [and five others] · Cross frames are critical members for the stability of straight and curved steel bridges. Conventional cross frames are often fabricated from steel angles; however these members have relatively poor structural behavior. Because of the low buckling strength, cross frames with angle diagonals

6564-1 [CTR] ... FHWA/TX-13/0-6564-1

Full-text Link:
14.2 MB


UT Curved Girder Analysis Tools (UTCGAT) -- Version: 1.0.0

2012 ... [Todd Helwig, University of Texas at Austin] · This software product was developed and is maintained by the University of Texas at Austin. UTCGAT is a suite of software tools for the analysis of curved girders. The suite consists of UT Bridge and UT Lift. UT Bridge is a 3-dimensional finite element program for the analysis of curved

5574-01-P2 [CTR] ... Product 5-5574-01-P2

Full-text Link:
Website with link to license agreement and software download

Cross-Frame and Diaphragm Layout and Connection Details


2011 ... RS: Michael Engelhardt; Researchers: Anthony Battistini [and five others] · The primary objective of this project was to develop an improved detail for attaching skewed cross-frames to girders that provides higher stiffness and better structural performance than the conventional bent plate detail. A secondary objective of this

5701-S [CTR] ... PSR 0-5701-PSR ... Project Summary Report, 0-5701

Full-text Link:


Cross-Frame Connection Details for Skewed Steel Bridges


2010 ... Craig Quadrato [and six others] · This report documents a research investigation on connection details and bracing layouts for stability bracing of steel bridges with skewed supports. Cross-frames and diaphragms play an important role in stabilizing steel girders, particularly during construction. The commonly used bent plate

5701-1 [CTR] ... FHWA/TX-11/0-5701-1

Full-text Link:
15 MB

Implementation of Straight and Curved Steel Girder Erection Design Tools Construction : Summary


2010 ... Jason Stith [and six others] · Project 0-5574 “Curved Plate Girder Design for Safe and Economical Construction,” resulted in the development of two design tools, UT Lift and UT Bridge. UT Lift is a spreadsheet-based program for analyzing steel girders during lifting while UT Bridge is a three-dimensional finite element

5574-01-1 [CTR] ... FHWA/TX-11/5-5574-01-1

Full-text Link:
411 KB

UT Lift 1.1


2010 ... by Jason Stith [and four others] · The purpose of this spreadsheet is to provide a tool and give information to an engineer when deciding the safety of lifting a horizontally curved steel I-girder with one crane and two lift clamps. The spreadsheet has been developed to indicate the necessary inputs and highlight the calculated

5574-01-P1 [CTR] ... Product 5-5574-01-P1

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Guidance for Erection and Construction of Curved I-Girder Bridges : Technical Report -- revised


2010 ... Jason Stith [and eight others] · This report summarizes the methods, results, and recommendations from a research investigation on the behavior of horizontally curved girders during construction. The primary focus of this study is the behavior during early stages of construction when little or no bracing is provided. Girder

5574-1 [CTR] ... FHWA/TX-10/0-5574-1

Full-text Link:
5.8 MB

Impact of Overhang Construction on Girder Design


2010 ... Seongyeong Yang [and four others] · Economical constraints on the design of bridges usually necessitate the use of as few girders as possible across the bridge width. The girders are typically uniformly spaced transversely with the deck extending past the fascia girders, thereby resulting in an overhang. While designers

5706-1 [CTR] ... FHWA/TX-10/0-5706-1

Full-text Link:
4.6 MB

Guidelines for Design and Safe Handling of Curved I-Shaped Steel Girders


2010 ... Jason Stith [and five others] · The purpose of this set of guidelines is to summarize recommendations from work completed as part of the Texas Department of Transportation (TxDOT) Research Project 0-5574 entitled “Curved Plate Girder Design for Safe and Economic Construction.” The research included field tests, three-

5574-P1 [CTR] ... Product 0-5574-P1

Full-text Link:
90 KB

Impact of Overhang Construction on Girder Design


2009 ... Todd Helwig [and four others] · Economical constraints on the design of bridges usually necessitate the use of as few girders as possible across the bridge width. The girders are typically uniformly spaced transversely with the deck extending past the fascia girders, thereby resulting in an overhang. While designers commonly

5706 [CTR] ... PSR 0-5706 ... Project Summary Report, 0-5706

Full-text Link:


Curved Plate Girder Design for Safe and Economical Construction


2009 ... Todd Helwig [and eight others] · Horizontally curved steel I-girder bridges are important components of the highway system that are commonly used for providing efficient transfer of traffic between major thoroughfares. The critical stage for the stability of these curved bridges generally occurs during early stages of erection and

5574 [CTR] ... PSR 0-5574 ... Project Summary Report, 0-5574

Full-text Link:


Design Guidelines for Steel Trapezoidal Box Girder Systems


2007 ... Todd Helwig [and four others] · The frequency of use of steel box girders has increased in the state of Texas and throughout the United States over the past 10 years. Some of the advantages of the structural shape that have led to the increased utilization include improved aesthetic, maintenance, and structural benefits.

4307-1 [CTR] ... FHWA/TX-07/0-4307-1

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Steel Trapezoidal Girders : State of the Art


2007 ... Todd Helwig, Eric Williamson and Reagan Herman · Since 1995, the Texas Department of Transportation (TxDOT) has funded several studies on trapezoidal box girders. The research in these studies was some of the first detailed work on curved box girders that had been carried out in nearly twenty years. Although the studies

4307-S [TTI] ... PSR 0-4307-S ... Project Summary Report, 0-4307

Full-text Link:


Behavior of Trapezoidal Box Girders with Skewed Supports : Summary


2006 ... Reagan S. Herman, Todd A. Helwig and Dawei Li · The purpose of this investigation was to improve understanding of trapezoidal box girder systems with skewed supports. The impact of external K-frames on the behavior of the internal Kframes and top lateral truss was also studied. The research investigation included both

4148-S [UH] ... PSR 0-4148-S ... Project Summary Report, 0-4148

Full-text Link:


Cross-Frame and Diaphragm Behavior in Bridges with Skewed Supports : Summary


2005 ... Todd A. Helwig [and three others] · Lateral torsion buckling is a failure mode that is generally critical during the construction stages for steel bridges. Prior to curing of concrete deck, the steel girders must support the entire load. The buckling capacity of the girders is improved by providing cross-frames and diaphrahms at

1772-S [UH] ... PSR 0-1772-S ... Project Summary Report, 0-1772

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Lateral Bracing of Bridge Girders by Permanent Metal Deck Forms : Summary


2005 ... Todd A. Helwig, O. Ozgur Egilmez and Charles A. Jetann · Lateral torsional buckling is a failure mode that often controls the design of steel bridge girders during construction. Bracing in the form of cross-frames and diaphragms is often provided at locations along the bridge length to reduce the unbraced length and increase the

4145-S [UH] ... PSR 0-4145-S ... Project Summary Report, 0-4145

Full-text Link:


Lateral Bracing of Bridge Deck Girders by Permanent Metal Deck Forms


2005 ... Todd Helwig, Ozgur Egilmez, and Charles Jetann · Traditional bracing systems for steel bridge girders typically consist of cross frames and diaphragms spaced along the length of the bridge. Other sources of bracing may provide improved performance and economy. Permanent metal deck forms are often used as formwork for

4145-1 [UH] ... 0-4145-1

Full-text Link:
3.14 MB

Behavior of Trapezoidal Box Girders with Skewed Supports


2004 ... Todd A. Helwig, Reagan S. Herman and Dawei Li · Trapezoidal steel box girder systems are frequently used in Texas for the construction of highway interchanges and elevated expressways in urban areas. There are a number of aspects of box girder bridges, including both aesthetic and structural advantages, which make them an

4148-1 [UH] ... Research Report 0-4148-1

Full-text Link:
3.3 MB

Cross-Frame and Diaphragm Behavior for Steel Bridges with Skewed Supports


2003 ... Todd Helwig and Liqun Wang · Steel bridge girders are prone to buckling from construction loads during casting of the concrete for the composite deck. The buckling capacity of the steel girders can be increased by providing bracing at intermediate locations along the girder length. The intermediate bracing typically takes the

1772-1 [UH] ... 1772-1

Full-text Link:


Field and Computational Studies of Steel Trapezoidal Box Girder Bridges


2000 ... Todd A. Helwig and Zhanfei Fen · Trapezoidal steel box girders are seeing increased use in the state of Texas as well as throughout the United States. In addition to a number of serviceability and aesthetic advantages for trapezoidal box girders, the large torsional stiffness of the closed box section is also a major structural

1395-3 [UH] ... 0-1395-3

Full-text Link:
2.4 MB

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