Verification of Performance and Design Criteria for High Performance Steel Bridges

Verification of Performance and Design Criteria for High Performance Steel Bridges PDF

Author:

Publisher:

Published: 2006

Total Pages: 148

ISBN-13:

DOWNLOAD EBOOK →

High Performance Steel (HPS) has quickly gained popularity in United States bridge applications due to its high yield strength and better weldability, toughness, ductility, and weathering characteristics. However, a great deal of information is missing from the body of knowledge on HPS performance and design criteria, especially concerning HPS-70W (485W) produced by thermo-mechanical controlled processing (TMCP). This research examines material characteristics and fatigue performance of HPS-70W (485W) TMCP, as well the performance of Ohio's first HPS bridge in service. Data from 96 tensile tests show that yield and ultimate strengths of HPS-70W (485W) TMCP are dependent upon plate thickness and orientation. 75 Charpy V-Notch (CVN) specimens were tested, and all met the ASTM A709 requirement for minimum toughness. Twenty-nine specimens were tested to investigate the fatigue resistance of continuous plates with punched, drilled, and reamed holes. Results from this investigation suggest that current restrictions mandated by some state departments of transportation concerning punching holes are not overly restrictive when HPS-485W (70W) is utilized. Performance of drilled and sub-punched and reamed specimens met or exceeded American Association of State Highway and Transportation Officials (AASHTO) (2004) requirements for Category B details. Performance of Submerged Arc Weld (SAW) and Narrow Gap Improved Electroslag Weld (NGI-ESW) welded butt-splices utilizing HPS-70W (485W) were examined. All specimens performed considerably better than predicted by the AASHTO fatigue life equation.

Strength and Performance Field Testing of Hybrid HPS Bridge A6101

Strength and Performance Field Testing of Hybrid HPS Bridge A6101 PDF

Author: Everett Ralph Oesch

Publisher:

Published: 2003

Total Pages: 364

ISBN-13:

DOWNLOAD EBOOK →

Bridge A6101 near Lexington, Missouri, is the first bridge in the state to utilize High Performance Steel (HPS). The Missouri Department of Transportation (MoDOT) built Bridge A6101 as part of the Federal Highway Administration's Innovative Bridge Research and Construction (IBRC) program. By placing HPS70W in only the highly stressed regions of the girder (hybrid design), a weight savings of 17% and a cost savings of 11% was achieved compared to a conventional 50W bridge. The University of Missouri-Columbia worked with MoDOT and West Virginia University to instrument, field test, analyze, and evaluate the strength and serviceability performance of Bridge A6101. This thesis presents the results of the strength portion of the testing. A companion thesis (Davis, 2003) presents the results of the strength performance study. The objectives of this work are to examine the strength performance of Bridge A6101 compared to design theory. This is accomplished through monitoring stresses when the bridge is subjected to calibrated loading. The stress results are modified to represent the design loading and compared to design theory. It is common knowledge that actual bridge response can vary significantly from design predictions. Past research (Barker, et al., 1999) has developed procedures to qualify and quantify factors that represent the differences. These field test procedures are applied to evaluate the strength performance of HPS Bridge A6101. The results show that, unlike in the design, the exterior girders were the critical component in the experimental tests. More of the truckload was distributed to the exterior girders than design predicts. This was also confirmed by finite element analysis from West Virginia University. The experimental capacity of the exterior girder was only 87.5% of the design capacity and at or just below the HS20 legal loading.

Lanterna Rally - Theme by Grace Themes