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Curved Steel Box Girder Design
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Module 1
AASHTO LRFD Framework and Steel Bridge Essentials
1
LRFD Philosophy: Load and Resistance Factors in AASHTO
Explain the philosophy of LRFD and the role of load factors (γ) and resistance factors (φ) in AASHTO.
2
AASHTO Limit States and Load Modifiers
Identify the AASHTO limit states (Strength, Service, Fatigue, Extreme Event) and apply the load modifier η (ductility, redundancy, operational classification).
3
Factored Permanent Loads for Steel Bridges
Compute permanent loads (DC, DW) and assemble their factored values for steel bridge superstructures.
4
HL-93 Live Load Application
Apply the HL-93 vehicular live load model with dynamic load allowance (IM) and multiple presence factors (m).
5
Steel Girder Bridge Load Combinations
Assemble Strength I, Service II, and Fatigue I/II load combinations for a steel girder bridge.
6
A709 Steel Grades & Resistance Factors
Identify AASHTO-recognized A709 structural steel grades and resistance factors (φ) for flexure, shear, and connections per AASHTO 6.5.4.
7
AASHTO Compactness Classification
Classify cross-section elements as compact, noncompact, or slender using AASHTO width-to-thickness limits.
8
Limitations of AASHTO Distribution Factors for Curved Tub Girders
Explain why AASHTO's simplified live-load distribution factors are invalid for curved tub girders, motivating the use of refined analysis methods.
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