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TASK 1.5.4 Analysis of Index Buildings Hiroshi Isoda (Building Research Institute, Japan) Andre Filiatrault Bryan Folz

CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 TASK 1.5.4 Analysis of Index Buildings Hiroshi Isoda (Building Research Institute, Japan) Andre Filiatrault Bryan Folz David Fischer (UC-San Diego)

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TASK 1.5.4 Analysis of Index Buildings Hiroshi Isoda (Building Research Institute, Japan) Andre Filiatrault Bryan Folz

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  1. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 TASK 1.5.4 Analysis of Index Buildings Hiroshi Isoda (Building Research Institute, Japan) Andre Filiatrault Bryan Folz David Fischer (UC-San Diego)

  2. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Overview • Task Objectives • Analysis Methodology • Description of Index Buildings • Model of Index Building No. 1: Small House

  3. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Task Objectives • Perform deterministic non-linear (time-history and/or push-over) analyses of four index buildings under various earthquake ground motions. • Coordinate with and submit work to the Subcontractor of Task 4.1: Improving Loss Estimation for Woodframe Buildings.

  4. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Methodology for Analysis • Non-linear pushover and time history dynamic analysis of the four index buildings will be performed using the specialized software being developed under Task 1.5.1: Development of Seismic Analysis Software for Woodframe Construction.

  5. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 (RUAUMOKO Program) Flowchart for Pushover and Time History Analysis of Woodframe Buildings

  6. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Description of Index Buildings • Four Index Buildings • Three Variants of Each Index Building • Superior Quality • Typical Quality • Poor Quality • Retrofit Schemes for Each Index Building

  7. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Description of Index Buildings • Small House: 1 story, 2 bedrooms, 1 bath, 1200 sq. ft. on a level lot; built before 1970. Two variations: with and without cripple walls. • Large House: 2 story, 3 bedrooms, 3 baths, 3 car garage, L-shaped; slab on grade and spread footings; recently constructed.

  8. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Description of Index Buildings • Small Townhouse: two story 1500-1800 sq. ft. unit with common wall; on a level lot; recently constructed and engineered design. • Apartment Building: 3 story with ten 800 sq. ft. units; all wood construction; parking on ground floor; constructed prior to 1970 and minimal engineering.

  9. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 30 ft 40 ft 30 ft Model of Index Building No.1: Small House • Built circa 1950 • Roof: • Composite shingle felt • Solid 1x6 straight sheathing boards • Floor: • Joists 2x6 @ 16 in • Solid 1x6 diagonal sheathing boards • Ceiling: • Gypsum board • Exterior Walls: • 3-coat 7/8 in exterior stucco • Gypsum board interior • Interior Walls: • Gypsum board

  10. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Variants of Small House

  11. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Cripple Wall Modeling Assumptions For Small House • Roof: • Only in-plane stiffness of ceiling considered • Gt = 8 kips/in (FEMA 273) • Floor: • Gt = 500 kips/in (FEMA 273) • Exterior, Interior, and Cripple Walls: • Wayne Stewart Hysteretic Model • Parameters for Stucco and Gypsum Wall Board Based on UC-Irvine Tests for City Of Los Angeles (COLA) • Parameters for Cripple Walls based on UC-Davis Tests for CUREE-Caltech Woodframe Project

  12. Hysteretic Model & Parameters CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 UC-Irvine Gypsum Board Tests UC-Davis 2-ft Level Cripple Wall Tests Wayne Stewart Hysteretic Model UC-Irvine Stucco Tests

  13. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Analysis Example

  14. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Analysis Results Floor Displacements Ceiling Displacements

  15. Hysteresis Loops: Foundation Walls CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Poor-Quality (Stucco Cripple Wall) Typical-Quality (Stucco Cripple Wall) Superior-Quality (Concrete Stem Wall)

  16. CUREe-Caltech Woodframe Project, Element 1 - Research Meeting, January 13, 2001 Schedule for Task 1.5.4

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