Category: Monthly Webinar Condition Assessment of In-Service Bridge Cables Using the Innovative BTC Method

May 16, 2024 1:00 pm

Khaled Mahmoud, Ph.D., P.E., Chief Bridge Engineer, BTC, New York City


Webinar Documents:
Presentation Slides - BTC Method Webinar - May 16, 2024
Announcements - Webinar News May 2024

Description: Cables for major bridges are typically composed of thousands of high-strength steel wires.  Over time, individual wires degrade due to the combined effect of loading and the environment resulting in a reduction of cable strength.  Due to the composition of the cables, we are only able to physically inspect approximately 10% of the wires.  Because of this limited access and scarce data, the current standard of practice for condition assessment and strength evaluation of cables must follow reliability-based analysis.  This presentation will introduce the innovative BTC method for evaluation of the strength and service life expectancy of in-service bridge cable.  The BTC method is a patented, fracture-based, probabilistic methodology that can be applied to both helical and parallel wire strands.  This method has been utilized on numerous bridges in the US, Canada, Europe, and Asia and has been in two FHWA published reports.


Khaled Mahmoud, Ph.D., P.E.
Chief Bridge Engineer, BTC
New York City, New York

Khaled Mahmoud is Chief Bridge Engineer for BTC. His work includes engineering of suspension cable system for Turkey’s 3rd Bosphorous Bridge, a hybrid suspension/cable-stayed bridge and 1915 Çanakkale Bridge, the world’s longest suspension bridge. He is an expert in fracture mechanics. Known for his work on bridge cable wire, Khaled invented the BTC method for cable strength evaluation, a patented and probabilistic methodology. The BTC method has been applied at Pierre Laporte Bridge in Canada, Forth Road Bridge in Scotland, Bronx-Whitestone Bridge, Mid-Hudson Bridge and Williamsburg Bridge in New York. He is the editor-in-chief of the journal of Bridge Structures.

Presentation Photos/Graphics:

1) Wedging and Inspection of Main Suspension Cable

2) Golden Gate Bridge Cable – (BTC Method has not yet been used on this bridge, the image is to visualize a cable cross section)

3) Fatigue Damage in Bridge Cable Wire

4) Preexisting Crack in Cable Wire

5)  Mid-Hudson Bridge - New York