Bridges & Structures

Geohazards

The geotechnical hazards for transportation applications covered under this technical area include method, procedural and policy guidance for seismic design and retrofit, extreme events, abandoned underground mines, and for evaluating bridges with unknown foundations.

Features

• Interstate Technical Group on Abandoned Underground Mines
• Unknown Foundations

Policy

• Additional Guidance for Assessment of Bridges Over Waterways with Unknown Foundations (10/29/2009)

Guidance

• Eligibility of Activities To Adapt To Climate Change and Extreme Weather Events Under the Federal-Aid and Federal Lands Highway Program (09/24/2012)
• Guidance on Applying Risk Based, Data Driven Decision-Making Process to the FHWA Scour Program (04/09/2012)
• HEC 18 - Evaluating Scour at Bridges (5th edition) (April, 2012)
• Geotechnical Engineering Circular No. 3 - LRFD Seismic Analysis and Design of Transportation Geotechnical Features and Structural Foundations Reference Manual (2011)
• Checklist and Guidelines for Review of Geotechnical Reports and Preliminary Plans and Specifications (February, 2003)
• Differing Site Conditions (10/09/1996)

Information

• HEC 23 - Bridge Scour and Stream Instability Countermeasures: Experience, Selection, and Design Guidance (3rd edition, Volume 1) (September, 2009)
• HEC 23 - Bridge Scour and Stream Instability Countermeasures: Experience, Selection, and Design Guidance (3rd edition, Volume 2) (September, 2009)
• Frequently Asked Questions - Bridges Over Waterways with Unknown Foundations (06/03/2009)

Training & Workshops

• All training

Publications

• Manual for Abandoned Underground Mine Inventory and Risk Assessment
• Hazards Publications

Memos

• GT-16 - Unknown Foundations (.pdf, 0.7 mb)