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

• National Strategy for Landslide Loss Reduction
• Abandoned Underground Mines Resources
• 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)
• Frequently Asked Questions - Bridges Over Waterways with Unknown Foundations (06/03/2009)
• 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)

Training & Workshops

• NHI 142081 Understanding Past, Current and Future Climate Conditions
• NHI 142082 Introduction to Temperature and Precipitation Projections
• NHI 142083 Systems Level Vulnerability Assessments
• NHI 142084 Adaptation Analysis for Project Decision Making

Publications

• Geohazards, Extreme Weather Events, and Climate Change Resilience Manual
• Geohazards, Extreme Weather Events, and Climate Change Resilience - Peer Exchange Report
• Manual for Abandoned Underground Mine Inventory and Risk Assessment
• Hazards Publications

Memos

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