Affiliation:
1. Maurer Switzerland GmbH, 8118 Pfaffhausen, Switzerland
2. Maurer SE, 80807 Munich, Germany
Abstract
<p>The TMD system of the footbridge "Inwilerstrasse" near Zug in Switzerland was model-based designed for the first vertical bending mode, the expected human excitation, assuming the inherent damping of 0.3 % and ensuring the acceleration limit CL1 (0.50 m/s<sup>2</sup>) of HIVOSS. After the installation of the locked TMDs, first, the TMD frequency was optimized based on the identified bridge eigenfrequency by adjusting the TMD mass.</p><p>Then, the bridge with locked and activated TMDs was excited by five synchronized persons. These tests were re-computed adopting the experimentally identified eigenfrequency and damping ratio of the first bending mode and the optimized TMD mass. The re-computation demonstrates that the excitation force amplitude of one bouncing person must be set to approximately 600 N in order to obtain the measured acceleration of 0.117 m/s<sup>2</sup> of the bridge with activated TMDs. The value of 600 N seems reasonable as this corresponds to approximately 80 % of the average body weight (76 kg) of one person. The very low acceleration of 0.117 m/s<sup>2</sup> of the bridge with activated TMD demonstrates the effectiveness of TMDs.</p>
Publisher
Asociación Española de Ingeniería Estructural
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