Identification of Dynamic Characteristics of a Continuous Dynamic System: Case Study for a Three-Story Flexible Steel Stairway


Abstract eng:
In this work, a modal shape identification procedure for a flexible steel stairway located within a building complex at Aristotle University in Thessaloniki, Greece is presented. The aforementioned stairway is a system with continuous distribution of mass and stiffness, a fact that makes structural identification challenging as compared to structures where these two basic parameters are observed to be lumped at certain locations such as the floors and the vertical support elements. More specifically, this stairway was instrumented using a local multi-channel network of accelerometers. Two twelve-bit nominal resolution, digital uniaxial accelerometers, connected by cables and with 'common time' and 'common start' characteristics were installed on the stairway. Dynamic input to the stairway was provided by pedestrian traffic. The dominant modes of vibration of the stairway were computed by the 'modal response acceleration time history' methodology, as developed by the authors over the last few years. In parallel, a detailed finite element method model of the stairway was built and calibrated according to the ambient vibration results. The present identification procedure used for the dynamic characteristics of spatial structures yields results that can be used to develop a family of numerical models for the stairway ranging from the simple single-degree-of-freedom system to highly detailed multiple-degree-of-freedom models. Finally, some useful information on the theoretical procedure for the identification of modal shapes is included in this work.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1011.:
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