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Dynamic response of structural timber flooring systems.

Weckendorf, Jan (2009) Dynamic response of structural timber flooring systems. PhD thesis, Edinburgh Napier University.

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      Abstract/Description

      The dynamic response of structural timber flooring systems can cause vibrational serviceability problems in terms of discomfort experienced by the occupants. A unified
      method to control timber floor vibrations has not been established to-date. The vibration problem is manifold. The complexity and the limited amount of research with respect to
      timber floor vibrations have shown an urgent need for further investigations.

      This thesis has focused on the effects of structural and non-structural modifications on the dynamic performance of timber flooring systems by using experimental data from
      sixty-seven full-scale flooring systems for analytical investigations so as to identify structural configurations and vibration parameters, which are promising to further the
      design against disturbing vibrations. The collected data have also been used to identify weaknesses of current design criteria and to build and validate a finite element (FE)
      model for eigenproblem analyses of timber I-joist floors. The experimental work has been carried out with support from industry, and part of the investigations with respect
      to the design criteria has been conducted as Visiting Scientist within a Short Term Scientific Mission of COST Action E55 at VTT - Technical Research Centre of Finland
      in Espoo, Finland.

      The significant effects of floor make-up and different configurations on their dynamic response are examined, with specific interest to stiffen dynamically sensitive locations
      targeted, and the most promising designs (configurations) are identified. The important effects of damping on the dynamic performance of flooring systems are addressed by
      determination of damping ratios from the full-scale experimental work. The results were then used to perform a series of statistical studies to identify and recommend more
      appropriate damping ratios for design of bare light-weight timber flooring structures based on a number of distinct structural properties. The computer-based finite element
      analysis has been successfully used to model a series of timber flooring systems incorporating timber I-joists for predicting modal parameters and their relative changes
      due to structural modifications. The analysis has demonstrated the significant influence of assigning spring stiffness at the supports and at the interface of deck and joists on the floor responses.

      Overall, this research has helped to achieve a much broader knowledge and greater understanding of dynamic response and vibrational characteristics of timber flooring systems, and has made a contribution to identifying improved structural design and furthering vibration prediction and assessment. Undertaking of any such measures and future work as suggested in this thesis could significantly contribute to the improvement of the structural design and the design to Eurocode 5 if results are incorporated in future revisions. This would lead to fewer nuisances for residential occupants and enhanced quality of life.

      Item Type: Thesis (PhD)
      Uncontrolled Keywords: Structural engineering; Timber floors; Dynamic response; Floor vibrations; Survey; Flooring systems; Floor configuration; Stiffening; Spring stiffness; Damping ratios; Eurocode 5 revision;
      University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
      Dewey Decimal Subjects: 600 Technology > 620 Engineering > 624 Civil engineering
      Library of Congress Subjects: T Technology > TA Engineering (General). Civil engineering (General)
      Item ID: 2962
      Depositing User: Dr. David A. Cumming
      Date Deposited: 22 Oct 2009 09:58
      Last Modified: 12 Jan 2011 04:51
      URI: http://researchrepository.napier.ac.uk/id/eprint/2962

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