Research and Education in Structural Dynamics and Control

The City College of New YorkThe City College of New York

Mr. Zhihua Yi (Presenter) Anil Agrawal (MCEER PI)

Research and Education Goals

Education of undergraduate students in structural dynamics and control through independent study and small scale experiments on Quansar shaking table

Integrated research and education of undergraduate and graduate students through 10,000 lb shaking table and 5-story building model

Advanced theoretical and experimental research in structural control

EducationEducation

Undergraduate students offered independent study course in structural dynamics, including experimental knowledge using Quansar shaking table facility

Seven undergraduate students took independent study course with Prof. Agrawal

Experimental structural dynamics introduced in undergraduate course during Spring 2003.

Undergraduate Students Using Quansar Undergraduate Students Using Quansar Shaking TableShaking Table

Quansar Shaking Table at CCNY

Undergraduate Students Using Quansar Undergraduate Students Using Quansar Shaking TableShaking Table

Graduate Student Teaching Structural Dynamics Through Shake Table

Undergraduate Students Using Quansar Undergraduate Students Using Quansar Shaking TableShaking Table

Undergraduate Student Performing Free Vibration

Integrated Research and EducationIntegrated Research and Education

A 10,000 lb unidirectional shaking table installed at the CCNY.

Force: 10,000 lb, Stroke: ± 6”, Vel.: 90 in/sec, Frequency: 0.4- 100 Hz

A 5-storey building model of 5000 lb weight being constructed.

Undergraduate students will participate in theoretical and experimental research from Summer 2003

Currently, 3 undergraduate students participate in research.

One undergraduate student visiting Japan during Summer 2003 to participate in REU Program in Japan.

Integrated Research and EducationIntegrated Research and Education

Advanced Theoretical and Experimental Advanced Theoretical and Experimental Research in Structural ControlResearch in Structural Control

Smart Base Isolation SystemsSmart Base Isolation Systems

A new design approach for smart base isolation system using a ground motion filter recently developed at the CCNY.

With this design, drift as well as absolute acceleration of the base-isolated buildings can be reduced simultaneously using semi-active or active controllers.

Performance of active and semi-active controllers is similar.

Earthquake ResponsesUn-

controlled

Viscous Damper (=37%)

Active Control

I

Active Control

II

Semi-active

Control

Viscous Damper (=15%)

(1) (2) (3) (4) (5) (6) (7) (8)

Rinaldi Receiving

Station (RRS228)

Base Drift (cm) 55.28 36.47 32.58 31.24 30.78 46.09

Sup. Drift

(cm)0.88 1.00 1.12 0.41 0.83 0.87

Base Acc. (g) 0.35 0.37 0.48 0.15 0.15 0.33

Sup. Acc. (g) 0.36 0.41 0.46 0.15 0.14 0.36

Peak Force   106.11 123.55 50 50 46.65

Takatori (TAK000)

Base Drift (cm) 89.53 39.42 39.01 33.77 39.47 55.46

Sup. Drift

(cm)1.43 0.94 1.20 0.59 0.92 0.97

Base Acc. (g) 0.57 0.38 0.48 0.12 0.15 0.38

Sup. Acc. (g) 0.59 0.39 0.49 0.13 0.15 0.40

Peak Force   92.87 115.83 50 50 49.41

Smart Base Isolation SystemsSmart Base Isolation Systems