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ECIV 320 Structural Analysis I

ECIV 320 Structural Analysis I. Structure. A system of connected parts used to support load. A structure is designed to serve a specific function for public use. From 2500 years old…. … to present…. … and future. Engineers build structures. Savannah GA. But things don’t always work….

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ECIV 320 Structural Analysis I

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  1. ECIV 320 Structural Analysis I Structure A system of connected parts used to support load A structure is designed to serve a specific function for public use

  2. From 2500 years old…

  3. … to present…

  4. … and future

  5. Engineers build structures Savannah GA

  6. But things don’t always work…

  7. Earthquake of February 4, 1976, Guatemala

  8. Failures Northridge 1994 Parking garage at California State University

  9. Failures San Fernando Mexico City

  10. Collapsed Cypress section of Interstate 880 the 1989 Loma Prieta (California)

  11. 1989, Loma Prieta Earthquake, 7.1R San Francisco-Oakland Bay Bridge

  12. Northridge earthquake apartment building in Northridge Soft Story Effects

  13. Office Buildings, Kobe 1995

  14. Kobe 1995 Collapsed first and second stories

  15. Kobe 1995 Leaning office building Collapsed walkway

  16. Collapse of Freeway in 1989 Loma Prieta, CA Earthquake (7.1R)

  17. Kobe 1995

  18. LIQUEFACTION-DIFFERENTIAL SETTLEMENTS Niigata, Japan.June 16, 1964, 7.4

  19. GROUND DEFORMATION-DIFFERENTIAL SETTLING Earthquake of July 29, 1967, Caracas, Venezuela.

  20. Factors in Design • Safety • Aesthetics • Serviceability • Environment • Economy

  21. QUESTION What is the optimumsize of a structural element in a structure that will support the required loads?

  22. GENERAL DESIGN PROCEDURES Problem Definition Service Functions Location Surface & Subsurface Conditions Infrastructure Environmental Impact etc • Constraints • Material Availability • Zoning Requirements • Construction Expertise ...

  23. General Design Procedures Geometric/Architectural Design ………. Altern. 1 Altern. 2 Altern. 3 Altern. n Final Layout Floorplans Elevations etc

  24. General Design Procedures Preliminary Structural Design ………. Altern. 1 Altern. 2 Altern. 3 Altern. n Prliminary Design: Location and arrangement of load bearing elements, columns, beams, footings etc., Sizing of structural elements for safety and serviceability Architectural Constraints - Simplicity & Duplication - Fabrication & Construction Procedures Economy: Add preliminary $ value to each design Select Alternative for Final Design

  25. General Design Procedures FINAL DESIGN Sizing of Members Design of Details Design Drawings* (Blueprints) Bill of Materials Total Cost *Design Drawings Complete and Easy to Read AISC: Detailing for Steel Construction Engineering for Steel Construction

  26. Define External Loads Estimate/Assume Initial Size of Structural Elements Calculate Self Weight Structural Analysis Select New Sizes Check Design (Codes & Specs) Safe Functional Economic NO YES O.K. Preliminary/Final Design

  27. OBJECTIVE OF THIS CLASS • Safety • Aesthetics • Serviceability • Environment • Economy

  28. OBJECTIVE OF THIS CLASS We will learn the concepts, methods and procedures that will allow us to estimate the “demand” imposed on structural members by external loads

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