principal investigator yan xiao, ph.d., pe. researchers: dr. l. xie

CUREe Woodframe ProjectCUREe Woodframe ProjectTask 1.4.1 - Anchorage of Woodframe BuildingsTask 1.4.1 - Anchorage of Woodframe Buildings

Hillside Connection Hillside Connection TestsTestsMeeting, January 12-13, 2001Meeting, January 12-13, 2001

Principal InvestigatorPrincipal Investigator

Yan XIAO, Ph.D., PE.Yan XIAO, Ph.D., PE.

Researchers: Dr. L. XieResearchers: Dr. L. Xie

University of Southern CaliforniaUniversity of Southern California

Program MeetingProgram Meeting

Project Meeting at USC on May 16, 2000 Nicolino G. Delli Quadri (LA DBS) Steve Pryor (Simpson Strong-Tie) Jim Russell Vida Tarasyoly (Rubicon) Chia-Ming Uang (UCSD) Yan Xiao (USC) Li Xie (USC)

Cyclic Testing of AnchorsCyclic Testing of Anchors

To experimentally define the hysteric To experimentally define the hysteric characteristics of primary and characteristics of primary and secondary anchorssecondary anchors

To identify the failure modesTo identify the failure modes To develop and calibrate analytical To develop and calibrate analytical

models for base level diaphragm design models for base level diaphragm design of hillside buildingsof hillside buildings

Test Matrix Test Matrix

Capacity by Manufacturer

Specimen AnchorJoist/

CollectorAllowableCapacityQ (kips)

EstimatedCapacityQ0 (kips)

PA-1 HD15 6x6 15.305 34.5

PrimaryAnchorsPA-2 PHD8 6x6 6.730 15.2

SA-1 HD5 (2)2x8 3.705 8.4

SA-2 PHD5 (2)2x8 4.685 10.6Secondary

Anchors

SA-3 HTT22 (2)2x8 5.250 9.9

Note: 1. All specimens use non-symmetric (single anchor) connection 2. Q0 = k Q / 1.33, where k = 2.5 for HTT22, 3.0 for other anchors.

Specimen: Primary Specimen: Primary Anchor, HD15Anchor, HD15

SPECIMEN PA-1 : PRIMARY ANCHOR HD15

NOTES:

Specimen:Specimen: Secandary Secandary Anchor, HD5Anchor, HD5

SPECIMEN SA-1 : SECONDARY ANCHOR HD5

NOTES:

Test SetupTest Setup

3 ton

2x3 ton Monorail Crane System

Frame

Reaction

Anchor HD5to be tested

Specimen SA-1 (4'x6')

Linear Potentiometers

Actuators+load cells

Actuators+load cells

for loadingAnchors

InstrumentationInstrumentation

SPECIMEN SA-1 : STRAIN GAUGE AT PLYWOOD AND JOISTS

Loading ProgramLoading ProgramLOADING PROCEDURE

1.0Q0 , 1.0D0

0.7Q0

0.5Q0

1.5D0

2.0D0

3.0D0

-1.0Q0

FORCE CONTROL

DISPLACEMENTCONTROL

-0.5Q0

-0.7Q0

Q0 = Capacity by Manufacturer (without safety factor);D0 = Displacement at Q0

Preliminary Test Results: Preliminary Test Results: PHD5PHD5

Preliminary Test Results: Preliminary Test Results: HD5HD5

Anchor BracketsAnchor Brackets

Hysteresis Loops: PHD5Hysteresis Loops: PHD5

-15

-10

-5

0

5

10

15

20

-20 0 20 40 60 80 100 120 140 160

Displacement (x10 -2 in)

Force (kips)

test

allowable capacity

estimated capacity

PullPush

Hysteresis Loops: PHD5Hysteresis Loops: PHD5

-15

-10

-5

0

5

10

15

-20 0 20 40 60 80 100 120 140 160

Displacement (x10-2 in)

Force (kips)

test

allowable capacity

estimated capacity

PullPush