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RISAfter-Fracture Reserve Strength of Two Four-Chord Aluminum Sign Trusses
Publisher: American Society of Civil Engineers
Abstract: Many departments of transportation use four-chord aluminum tubular truss structures to support dynamic message signs (DMS). Inspections have often revealed that these structures contain cracks that likely occurred during ...
Identifying Effective and Ineffective Retrofits for Distortion Fatigue Cracking in Steel Bridges Using Field Instrumentation
Publisher: American Society of Civil Engineers
Abstract: It is estimated that nearly 90% of all fatigue cracking is the result of out-of-plane distortion or other unanticipated secondary stresses at fatigue-sensitive details. Neither design specifications nor evaluation ...
Consistent Approach to Calculating Stresses for Fatigue Design of Welded Rib-to-Web Connections in Steel Orthotropic Bridge Decks
Publisher: American Society of Civil Engineers
Abstract: The current (2004) fatigue design provisions in the 3rd Ed. of the AASHTO
Development of a Fatigue Design Load for High-Mast Lighting Towers
Publisher: American Society of Civil Engineers
Abstract: Fatigue cracking has caused a number of high-mast lighting tower (HMLT) failures throughout the United States. Both buffeting and vortex shedding have been shown to contribute to the failures observed. To increase HMLT ...
Influence of Base Plate Flexibility on the Fatigue Performance of Welded Socket Connections
Publisher: American Society of Civil Engineers
Abstract: This study investigates the effect of base plate flexibility on the behavior and fatigue performance of welded socket connections commonly used in sign support structures. The results of a three specimen static load testing ...
Large-Scale Axial Fracture Experiments of High-Toughness Steel
Publisher: ASCE
Abstract: Fracture resistance of modern bridge steels has improved through advances in material production techniques. The enhanced performance has been quantified through a number of material characterization studies and large-scale ...
Retrofit of Steel Columns: Parametric Studies and Design
Publisher: American Society of Civil Engineers
Abstract: Cover plates are often added to existing (loaded) steel columns as an effective retrofit method for increasing their compressive design strength. Current bridge design specifications provide equations for calculating the ...
Influence of Flexibility on the Fatigue Performance of the Base Plate Connection in High-Mast Lighting Towers
Publisher: American Society of Civil Engineers
Abstract: This study investigates the effect of base connection geometry on base plate flexibility and the fatigue performance of multisided high-mast lighting towers. Three parametric studies investigating the effect of base plate ...
Proposed Method for Determining the Interval for Hands-on Inspection of Steel Bridges with Fracture Critical Members
Publisher: American Society of Civil Engineers
Abstract: The proposed assessment procedure presented in this paper may be used to establish inspection intervals for steel bridges with fracture critical members (FCMs) (if adopted by the Federal Highway Administration). The procedure ...
Rapid Ranking Procedures for Gusset Plate Connections in Existing Steel Truss Bridges
Publisher: American Society of Civil Engineers
Abstract: Evaluation and rating of steel truss bridge connections has become imperative for many transportation agencies after the recent collapse of the I-35W Bridge in Minneapolis. Detailed engineering capacity calculations of ...