data acquisition interface to support seismic retrofit kenneth hanson cerritos college

22
Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Upload: richard-page

Post on 17-Dec-2015

215 views

Category:

Documents


1 download

TRANSCRIPT

Page 1: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Data Acquisition Interface to Support Seismic Retrofit

Kenneth Hanson

Cerritos College

Page 2: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Overview- Retrofit Project

Long Beach Public Safety BuildingCSULB Involved in Unique Project Data collection during seismic retrofit Correlate data with construction progress Identify changes in structural characteristics as

construction progresses

Critical facility-Down Town Long Beach Fire station Police station City jail Emergency response services

Page 3: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Overview- Retrofit Project

6-story, Steel-FrameUndergoing a $30M seismic retrofitDense Instrumentation

Data Collection Before retrofit During retrofit After retrofit

Page 4: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Acceleration Measurements

Project: Automate Ambient Vibration Measurements Very important, especially during

construction

National Instruments NI-4472 PCI data acquisition 24-bits Synchronized timing

Page 5: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Acceleration Measurements

K-2 Data Recorders Kinemetrics Inc. Automatic recording when

earthquake event happens Threshold-based recording

Page 6: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Structural Health Monitoring

Measurements of building structural responseCompare model predictions to measured responses Modeling

Finite element model Linear Nonlinear

Model response to earthquakes Historical earthquake records Pre-retrofit Post-retrofit

Page 7: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Statement of the Problem:

Ambient vibration data must be acquired before, during and after the retrofit. Presently stored data is manually taken twice a week at the building location. To perform real time data measurements the output of the existing system does not interface with the National Instruments Data Acquisition (DAQ) system.

Page 8: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Solution to the problem:

Design and fabricate an interface that would allow data to be routed around existing hardware to provide real time data acquisition, measurement and display.

Page 9: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Instrumentation

Vibration measurements Accelerometers

Strain measurements Strain gages Fiber-optic strain sensors

Displacement measurements Laser based displacement

Acoustic Emission Sensors

Page 10: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Instrumentation: Installation Time Line

2-axis EPI Sensor

STRONG MOTION ACCELEROMETERS. Installed pre-retrofit

K2 recorderK2 recorder DATA ACQUISITION . Pre- and Post-retrofit installation.

SGSTRAIN GAGES. Installation during retrofit.

AE ACOUSTIC EMISSION SENSORS. Post-retrofit installation.

FOSG

FIBER-OPTIC STRAIN GAGES. Post-retrofit installation.

LFD LASER-BASED FLOOR DISPLACEMENT. Install during retrofit.

EPI Sensor

STRONG MOTION ACCELEROMETERS. Post-retrofit installation.

Page 11: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

2-axis EPI Sensor

6th Floor

3-axis EPI Sensor

5th Floor

EPI Sensor

EPI Sensor

2-axis EPI Sensor

4th FloorEPI Sensor

2-axis EPI Sensor

3rd FloorEPI Sensor

3-axis EPI Sensor

2nd FloorEPI Sensor

2-axis EPI Sensor

1st FloorEPI Sensor K2 recorder

K2 recorder

K2 recorderK2 recorder

K2 recorderK2 recorder

PC

RS232

RS232

Basement Instrument cabinet on 1st floor

SG

AE

SG

SG

SG

SG

SG

FOSG

LFD

LFD

LFD

LFD

LFD

LFD

AE

Page 12: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Modified System Diagram

Page 13: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Interface Hardware

Page 14: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Retrofit Project

The Long Beach Public Safety Building

Page 15: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Starting from Scratch

LBPSBRetrofitPhase

Page 16: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Fig. 1. Three Dimensional Numerical Model ofPre-retrofit Long Beach Public Safety Building

LocationsSensor

Page 17: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Post-Retrofit Measurements

New Shear Wall

Strain Gages to be Installed

Page 18: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Acceleration Measurements

FBA - Accelerometer

3-axis

Installed in LBPSB

2nd Floor

Page 19: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Acceleration Measurements

K2 Recorders

Instrument cabinet

Page 20: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Acceleration Measurements

Computer Cabinet

Installed in LBPSB

Page 21: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Acceleration Measurements

0 2 4 6 8 10-1

0

1x 10

-3

Acc

el.

(g)

Baseline Measurements: Roof Center - Oct. 1999

0 2 4 6 8 10-3.5

-3

-2.5x 10

-3

Acc

el.

(g)

0 2 4 6 8 100.01

0.012

0.014

0.016

Time (sec)

Acc

el.

(g)

Typical

Acceleration

Measurements

Time History

Page 22: Data Acquisition Interface to Support Seismic Retrofit Kenneth Hanson Cerritos College

Post-Retrofit Activities

Remote CapabilitiesLong Term Role of CSULB