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Crane lowering a steel plate girder onto bridge bearings while ironworkers guide it.

CEGR 492 · Engineering Design Studio · Structural Engineering

Progressive Collapse

Girder erection: constructability, lifting weight and bearing detail turn a design into a built span.

Phase VI · Engineering Design Studio · Week 9

Progressive Collapse and Alternative Load Path Studio

Evaluate redundancy, tie forces and alternative load paths under notional member removal.

UFC 4-023-03
ASCE 7 Ch. 1.4
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Removal scenarios designed

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Checks passing

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Open warnings

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No removal scenario yet

Add a removal scenario to record its inputs, capacity and governing check.

Learning objectives

  • Run notional removal scenarios
  • Check alternate load paths
  • Design continuity ties

Engineering judgment

  • Redundancy is designed, not hoped for.
  • Continuity ties are cheap insurance.

Governing standards

  • ASCE 7-22

    Minimum Design Loads and Associated Criteria

    Dead, live, snow, wind, seismic, flood loads and combinations

    Ch. 2 Combinations
    Ch. 4 Live
    Ch. 26–30 Wind
    Ch. 11–12 Seismic
  • AISC 360-22

    Specification for Structural Steel Buildings

    Steel member and connection design

    Ch. D Tension
    Ch. E Compression
    Ch. F Flexure
    Ch. J Connections
  • ACI 318-19

    Building Code Requirements for Structural Concrete

    Reinforced concrete design and detailing

    Ch. 9 Beams
    Ch. 10 Columns
    Ch. 22 Strength
    Ch. 25 Detailing
  • TMS 402/602-22

    Building Code Requirements for Masonry Structures

    Masonry walls, lintels, pilasters

    Ch. 8 ASD
    Ch. 9 SD

FE Civil connection

Structural redundancy

Handbook section: Structural Analysis

Practice this FE topic

Recommended next step

Foundation Design Studio

Design shallow foundations: bearing capacity, settlement, eccentricity, sliding, overturning and reinforcement.

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