ESWP: International Bridge Conference®: Design Part 2

Design, Part 2

Wednesday, June 4, 2008
8:00 AM - 12:30 PM

Chair: Matthew P. McTish, PE, McTish, Kunkel & Associates, Allentown, PA

IBC 08-58 - Updating the HL-93 LRFD Bridge Design Live Load Using Recent Traffic Data
Bala Sivakumar, HNTB Corporation, New York, NY; Michel Ghosn, City College of New York, New York, NY

LRFD HL-93 loading, calibrated using 1975 truck data from Ontario may not represent present U.S traffic loadings in many jurisdictions. Trucks have become much heavier and truck configurations have become more complex. Although the quality and quantity of traffic data has improved in recent years, it has not been used to update the bridge design loads. The objective of NCHRP Project 12-76, that will be completed in February 2008, is to develop and demonstrate the application of protocols for collecting and processing traffic data to calibrate national bridge live-load models for LRFD bridge design.

IBC 08-59 - Link Slab Continuity Detail on Long-Span Bridges
Wendy Haugeto, Michael Baker Jr., Inc., Princeton, NJ; Arjuna Ranasinghe, Michael Baker Jr., Inc., Newark, NJ

Many existing and new steel and concrete bridges with simply supported girders where the deck is made continuous over the supports have shown cracking of the deck and often complete separation at the point of continuity. The paper details several continuity options for simple span bridges used in both steel and concrete bridges and provides suggestions to improve them.

IBC 08-60 - An Innovative Approach to Improve Economy and Constructability of Steel Plate Girder Bridges
Richard Lawrie, Lubin Gao, Lawrie and Associates, Alexandria, VA

The paper's objective is to investigate the structural behavior of an innovative system and explore its benefits. Staging the deck pours and post-tensioning the deck in the negative moment regions can provide a more durable deck. Also, sections of the steel plate girders can be reduced, providing significant cost savings.

IBC 08-61 - Fast Track Design of Two Rail Bridges for the Farm Lane Underpass Project
Jeremey Hedden, Bergmann Associates, Lansing, MI; David Thurnherr, Bergmann Associates, Rochester, NY

The Farm Lane Road Underpass project on the campus of Michigan State University provided an opportunity to incorporate innovative contracting solutions with streamlined railroad and utility coordination to save construction time, reduce client costs, and offer significant reductions to the impacts on pedestrian and vehicular traffic on campus from the daily train delays.

IBC 08-62 - 3d Visualization in Bridge Construction Planning
Michael Mundy, R.A., HNTB, Kansas City, MO

This paper describes how 3D Visualization may be used to ensure contentment by all parties involved or affected by the bridge construction project, including examples of fixed, moveable, railroad, pedestrian and transit bridges. 3D Visualization encourages mutual understanding by builders, designers and the general public.

IBC 08-63 - Finite Element Models for Curved Hollow Tubular Flange Girders
Richard Sause, Jun Dong, Lehigh University, Bethlehem, PA

Curved hollow tubular flange girgers (CHTFGs) are innovative I-shaped steel girders with rectangular tube-shaped flanges designed for curved highway bridges. A finite element (FE) parametric study of CHTFGs is presented. The results suggest that CHTFG systems perform better than similar-sized conventional curved I-girgers during transport, erection, and deck placement.

IBC 08-64 - Fatigue Behavior of Orthotropic Steel Decks - A Full-Scale Fatigue Test Under Running Wheel Loading
Xiaohua H. Cheng, New Jersey Department of Transportation, Trenton, NJ; Jun Murakoshi, Public Works Research Institute, Tsukuba, Japan

Most fatigue tests on orthotropic decks were conducted under fixed-point cyclic loading, focusing on a specific welded detail instead of all. To simulate truck wheel loads randomly passing on a deck, a unique wheel load testing machine was used on a full-scale specimen. This paper presents test results that would be helpful for design and inspection.

IBC 08-65 - Bridge Structures Constructed in a Design Build Environment
Tony Martin, Hatch Mott MacDonald, Vancouver, BC, Canada

The Sea-to-Sky Highway Improvement DBFO Project comprises highway improvements for an existing transportation corridor extending between Horseshoe Bay, West Vancouver and Function Junction, near Whistler, B.C. New highway and structure works improvements occur on sections totaling approximately 65 km of the 95 km corridor. Construction to be completed by July, 2009, prior to the start of the 2010 Winter Olympics in Whistler

IBC 08-66 - Buckling Analysis Using Finite Elements
Terry Cakebread, LUSAS, New York, NY; Julian Moses, LUSAS, Surrey, UK

Increasingly designers are being asked to check for stability of structures during erection as well as thereafter. This presentation will show how to carry out linear and nonlinear buckling analysis on any bridge type, the ease of carrying this out, the techniques available and the key things to check for when modelling such effects.

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