College - Author 1

College of Architecture and Environmental Design

Department - Author 1

Architectural Engineering Department

Degree Name - Author 1

BS in Architectural Engineering

College - Author 2

College of Architecture and Environmental Design

Department - Author 2

Architectural Engineering Department

Degree - Author 2

BS in Architectural Engineering

Date

6-2022

Primary Advisor

Peter Laursen, College of Architecture and Environmental Design, Architectural Engineering Department

Additional Advisors

Cole McDaniel, College of Architecture and Environmental Design, Architectural Engineering Department

Abstract/Summary

The authors of this report are Architectural Engineering undergraduate students at California Polytechnic State University, San Luis Obispo. Damping is a complex, experimentally derived value that is affected by many structural properties and has a profound effect on the dynamic response of structures. Deducing the inherent damping of a steel moment frame and affecting the damping ratio with viscous dampers are two topics explored in this paper. Dampers are commonly implemented in resilient structures that perform better in a design basis earthquake, reducing the seismic cost and downtime. Undergraduate coursework does not delve into the factors that affect damping and further exploration of this topic can provide a better intuition for this crucial aspect of seismic design. A time history analysis in ETABS is compared with real acceleration data of a scale structure excited by a mass shaker. The tests identified a significant decrease of acceleration in the structure for each successive increase in damping, even when utilizing off-the-shelf devices. The analytical model was capable of producing results consistent with experimental data. This suggests the modeling of dampers in structural design can be reliable and showcases the utility of the application of dampers in high seismic zones.

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