<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>20382</id>
    <completedYear/>
    <publishedYear>2011</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>71</pageFirst>
    <pageLast>81</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>Springer</publisherName>
    <publisherPlace>New York, NY</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2017-10-24</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Identification of the Tensile Force in Tie-rods of Historical Constructions</title>
    <abstract language="eng">This paper addresses the problem of the bending curvature due to self-weight of tie-rods when using dynamical approach to identify the tensile force in tie-rods of historical constructions. Although several dynamic testing methods have been proposed in the literature, the effect of bending curvature due to self-weight of the rods on their frequency values has not been studied. In this work, the bending curvature due to self-weight of tie-rods with small cross-section-to-length ratios is proven to have significant effect on their frequency values of the first vibration mode at low tensile stresses. As a result, the accuracy of the identified tensile force in tie-rods will be affected if the effect is not accurately considered. Four tie-rod specimens of different characteristics were tested in laboratory by dynamic tests. A numerical model was developed for axially loaded tie-rod using a FE program, assuming Euler beam with uniform cross-section and rotational springs at both supports. By calibrating the experimental and numerical results, the most suitable dynamical analysis for tie-rod models to take into account the effect of bending curvature due to their self-weights is concluded. In particular, the analysis should be performed in two steps: (i) first, the static geometric non-linear analysis to obtain the deflected shape of the tie-rod due to its self-weight and an applied tensile force; (ii) then, the modal analysis is run on the deflected tie-rod to achieve the frequencies and mode shapes via free vibration at that applied tensile force. When the effect of bending curvature due to self-weight of tie-rods is neglected, the frequency of the first mode should be excluded. Based on these conclusions, two techniques to identify in-situ the tensile stress in tie-rods are discussed. They are frequency-based identification techniques that minimize the measurement errors. In addition, a methodology to estimate a range of tensile stress using a formula or two selfconstructed standard charts is proposed.</abstract>
    <parentTitle language="eng">Civil Engineering Topics, Volume 4, Proceedings of the 29th IMAC, A Conference on Structural Dynamics, 2011</parentTitle>
    <identifier type="doi">10.1007/978-1-4419-9316-8_6</identifier>
    <identifier type="isbn">978-1-4419-9316-8</identifier>
    <identifier type="isbn">978-1-4419-9315-1</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="UBICOseries">Conference Proceedings of the Society for Experimental Mechanics Series ; 7</enrichment>
    <author>
      <firstName>Thi Mai Hoa</firstName>
      <lastName>Luong</lastName>
    </author>
    <submitter>
      <firstName>Thi Mai Hoa</firstName>
      <lastName>Luong</lastName>
    </submitter>
    <editor>
      <firstName>Tom</firstName>
      <lastName>Proulx</lastName>
    </editor>
    <author>
      <firstName>Luís F.</firstName>
      <lastName>Ramos</lastName>
    </author>
    <author>
      <firstName>Rafael</firstName>
      <lastName>Aguilar</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Axial force</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Tie-rod</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Historical constructions</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Finite element model updating</value>
    </subject>
    <collection role="institutes" number="6202">FG Bautechnikgeschichte</collection>
  </doc>
</export-example>
