Evaluation of the Dynamic Behavior of Steel Staircases with Concrete-Filled Pan Treads
Publication: Journal of Architectural Engineering
Volume 27, Issue 2
Abstract
Vibration serviceability of staircases is an increasing challenge due to evolving materials and structural forms. To predict the dynamic performance of staircases, accurate models are required. However, few technical guides are available for designing steel staircases, and those that exist are often limited in their applications due to a lack of research. This research aimed to improve the understanding and accuracy of the global vibration response (natural frequencies and mode shapes) predictions of concrete-filled pan tread stairs. In this project, experimental data were collected on two types of staircases and then used to create and tune a finite-element model using shell and beam elements. Using the experimentally updated finite-element model, a parametric study was conducted varying the railing mass and boundary conditions to demonstrate their effects on the staircases’ dynamic behavior. AISC design guide procedures were used to assess their applicability for staircases with wall- versus face-stringer boundary conditions. Finally, design suggestions for engineers are provided.
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Acknowledgments
The research presented in this study was financially supported by the University of Nebraska–Lincoln Durham School of Architectural Engineering and Construction. This support is gratefully acknowledged.
Notation
The following symbols are used in this paper:
- E = Es
- stringer elastic modulus;
- fn
- fundamental natural frequency;
- g
- gravitational acceleration;
- It
- stringer moment of inertia;
- k
- stiffness;
- L = Ls
- length of stringer;
- m
- mass;
- W = Ws
- weight of stair; and
- ωn
- natural circular frequency.
References
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© 2021 American Society of Civil Engineers.
History
Received: Sep 11, 2020
Accepted: Dec 29, 2020
Published online: Mar 17, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 17, 2021
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