Meeting at UC-San Diego13 January, 2001 Task 1.1.2: Shake Table Tests of a Multi- Story Apartment...

Meeting at UC-San Diego13 January, 2001

Task 1.1.2: Shake Table Tests of a Multi-Story Apartment Building with Tuckunder

Parking

Khalid M. MosalamAssistant Professor, University of California Berkeley

Stephen A. Mahin, Co-PIClay J. Naito, Post-doc.

Erik Kunkel, Grad. studentSuzanne Robinson, Grad. student

Patrik Meyer, Undergrad. student

Building Design

1. Apartment building with tuckunder parking (open front in the ground story) and flat roof

2. Three-story structure 3. Upper two stories have 2 units with doors and windows

on back wall and windows on front wall4. 1960’s structure designed according to UBC-645. Model dimensions: 32’ x 16’ x 27’

Rehabilitation

Reduce the risk of ground story collapse

• Design according to UBC-97• Vertical elements at open front: steel moment frames• Enhancement of ground story back wall with holdowns at

openings

System TestingQuasi-static:

1) First story with open front (initial stiffness)

2) First story with retrofitted front

Dynamic:

1) First story with closed front (vibration)

2) First two stories with closed front (vibration)

3) First two stories with open front (vibration)

4) Three story with steel moment frame at front

5) Three story with open front

6) Three story with open front and finish materials

7) Finished three story with steel moment frame at front

Component TestingTwo types of connections:

1) Vertical elements to header (SMF, OMF, shear wall)

2) Diaphragm to header (four conditions)

a) Existing b) Minimal c) Moderate d) Conservative

a) 2-10d TN (each side) b) Same as a) + A35 (every other block)c) Same as b) + 2-LS70 top d) same as b) + 8d @ 4’’

6x12

2x12

Diaphragm to Header Setup

Diaphragm to Header SpecimensID C0 C1 C2

Header to Joist(per joist)

4–10d TN 4–10d TN 2–16d TN

Joist to Blocking(ea. side)

Alternate2–16d EN

&4–8d TN

4–10d TN Alternate2–8d EdgeTN & 1–8dCorner TN

Blocking to Header None 4–10d TN None

Joist to PlywoodTypical Field Nailing of

8d @ 12 in.

Preliminary Results