Fundamental Frequencies of Vibration of Footbridges in Portugal: From <i>In Situ</i> Measurements to Numerical Modelling

<table class="table-group" id="tab11"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td align="left" rowspan="2">Mode direction</td><td align="center" colspan="2">Span 22 m</td><td align="center" colspan="2">Span 12.5 m</td><td align="center" colspan="2">Span 10.7 m</td></tr><tr class="thead"><td align="center"><i>In  situ </i></td><td align="center"> Analytical</td><td align="center"><i>In  situ </i></td><td align="center">Analytical</td><td align="center"><i>In  situ </i></td><td align="center">Analytical</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td align="left">Longitudinal</td><td align="center">2.2</td><td align="center">2.25</td><td align="center">—</td><td align="center">—</td><td align="center">—</td><td align="center">—</td></tr><tr><td align="left">Transversal</td><td align="center">2.6 </td><td align="center">2.69 </td><td align="center">—</td><td align="center">—</td><td align="center">—</td><td align="center">—</td></tr><tr><td align="left">Vertical</td><td align="center">3.58</td><td align="center">3.51</td><td align="center">10.7</td><td align="center">10.64</td><td align="center">13.5</td><td align="center">14.5</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Comparison of frequencies (Hz) between measurements <i>in  situ</i> and the analytical model.

Shock and Vibration

tab11

Table 11

Table 11: Fundamental Frequencies of Vibration of Footbridges in Portugal: From <i>In Situ</i> Measurements to Numerical Modelling 

Shock and Vibration

Fundamental Frequencies of Vibration of Footbridges in Portugal: From In Situ Measurements to Numerical Modelling

Table 11