AASHTO LRFD

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AASHTO Specification Background: Geotechnical Engineering Presence

History of AASHTO: Design & Construction Specifications for Bridges and Structures

“Geotechnical Scope”:   AASHTO Design & Construction Specifications for Bridges and Structures

Standard and LRFD AASHTO Specifications

LRFD IMPLEMENTATION STATUS

What are UNIQUE Geotechnical issues related to LRFD

What Should I Know and Do

Fundamentals of LRFDPrinciples of Limit State Designs

Resistance can be defined in terms of:

Limit States

Extreme Event Limit State

Subsurface Materials

Overview of Soil and Rock Materials

Soil Characteristics

Rock Characteristics

Atterberg Limits

Effective Stress – Spring Analogy

Soil Shear Strength

Undrained Strength of Cohesive Soils, s_u

Soil Deformation

Consolidation Properties

Typical Consolidation Properties

Elastic Properties of Soil

Rock Properties

Intact Rock Strength

Rock Quality

CSIR Rock Mass Rating System

Rock Mass Strength

Rock-Mass Quality and Material Constants

Intact Rock Deformation, E_i

Rock Mass Deformation