CUREE Banner

CUREE-Caltech Woodframe Project

Element 1 - Testing & Analysis
Task 1.1.2 Shake Table Test of Multi-Story Apartment Building with Tuck-under Parking

PI: Khalid M. Mosalam (University of California, Berkeley)

Problem Statement

Multi-story residential wood-frame buildings with tuck-under parking experienced significant damage during recent earthquakes. Several factors led to this damage, including soft (or weak) first story and the asymmetric configuration of such structures. Under multi-directional ground motion, the seismic response of these buildings is not fully understood and cannot be reliably predicted using existing computational tools. Moreover, the poor performance of these buildings mandates developing viable rehabilitation methodologies to improve their seismic performance.

Main Objectives

The main objective of Task 1.1.2 is to conduct multi-directional shake table tests of a full-scale three-story multi-family building with tuck-under parking. The building is designed and constructed to represent 1960’s engineering practice in Northern California. In addition to testing the original building, a rehabilitated building will be tested using a special moment resisting steel frame in the open front to improve the seismic performance of the first story.

Methodology

The test structure for Task 1.1.2 represents a full-scale multi-family building with tuck-under parking in the first story. The design and construction follow typical 1960’s practice in Northern California. The floor dimensions of the test building is 16 ft x 32 ft where the long direction has a completely open front in the first story. All stories are 9 ft high with realistic sizes and locations of windows and doors in the long direction walls. Ground shaking in both short and long directions of the building will be applied. Restrictions of the shake table size led to adopting smaller floor dimensions than those of typical buildings. Therefore the design aimed at matching the UBC-64 demand to capacity ratios of the test building to those of a selected prototype building with floor dimensions of 32 ft x 60 ft.

The lateral load resisting system of the test building in the short direction consists of two exterior solid shear-walls. One interior partition wall in the short direction will be constructed in the middle of the second and third stories. On the other hand, lateral shaking in the long direction of the building is resisted by either

    a) a perforated shear-wall in the rear of the unrehabilitated building, or
    b) a rear perforated shear-wall and a front special moment resisting steel frame for the rehabilitated building.

Ten main phases of Task 1.1.2 are planned. These phases are briefly summarized in the following list:

  1. Component testing of the open front rehabilitation options. This will include testing the retrofit vertical element/header subassembly. Three options will be investigated. Currently, the options under consideration are a) special moment resisting steel frame, wood shear-wall, and c) ordinary moment resisting steel frame.
  2. Quasi-static loading at the geometric center of the first floor along the long direction of the unfinished original first story with the objective of quantifying the stiffness of the unrehabilitated first story.
  3. Quasi-static loading at the geometric center of the first floor along the long direction of the unfinished rehabilitated first story with the objective of quantifying the stiffness, capacity, and damage pattern of the rehabilitated first story. Special moment resisting steel frame will be used as the rehabilitation element.
  4. Low-level sinesweeps of the unfinished first story of the three-story building with closed front to quantify the vibration characteristics of the symmetric one-story substructure.
  5. Low-level sinesweeps of the unfinished first two stories of the three-story building with closed front in the first story to quantify the vibration characteristics of the symmetric two-story substructure.
  6. Low level sinesweeps of the unfinished first two stories of the three-story building with open front in the first story to quantify the vibration characteristics of the asymmetric two-story substructure.
  7. Bi-directional ground shaking of the unfinished original three-story building with tuck-under parking under increasing intensity of the ground shaking. The objective is to characterize the stiffness, capacity, and damage pattern of the original multi-story tuck-under building without finish materials.
  8. Bi-directional ground shaking of the unfinished rehabilitated three-story building with tuck-under parking under increasing intensity of the ground shaking. Special moment resisting steel frame will be used in the open front as the rehabilitation element. The objective is to characterize the stiffness, capacity, and damage pattern of the rehabilitated multi-story tuck-under building without finish materials.
  9. Bi-directional ground shaking of the finished rehabilitated three-story building with tuck-under parking under increasing intensity of the ground shaking. Special moment resisting steel frame will be used in the open front as the rehabilitation element. The objective is to characterize the stiffness, capacity, and damage pattern of the rehabilitated multi-story tuck-under building with finish materials.
  10. Bi-directional ground shaking of the finished original three-story building with tuck-under parking under increasing intensity of the ground shaking. The objective is to characterize the stiffness, capacity, and damage pattern of the original multi-story tuck-under building with finish materials.

More Information

Reports

    Quick Report : Oct. 12, 2001 - Shake Table Experimentation - [564 K]
    Quick Report : Dec. 12, 2001 - Shake Table Experimentation - [3.4 MB]
    Phase 6 Update
    : Jan 5-6, 2002 - Shake Table Experimentation - [1.6 MB]
    CUREE Report : W:19: Seismic Evaluation of an Asymmetric Three-Story Woodframe Building

CUREE-Kajima Project
Project Description
Organizational Chart
Personnel Directory
Testing & Analysis
Field Investigations
Building Codes & Standards
Economic Aspects
Education & Outreach
Woodframe Project Publications
Newsletter Archive
Project Video
Funded by:

through a grant administered by


© CUREE. All rights reserved.
Consortium of Universities for Research in Earthquake Engineering
last updated 09.26.11