Abstract
This paper reports on the dynamic characterisation of a Reinforced Concrete (RC) stadium grandstand module for the Sporting Stadium in Lisbon. To this aim, a three-dimensional (3D) Finite-Element (FE) numerical model, implemented according to the technical drawings of the structure, is first presented to provide preliminary estimates of the expected modal characteristics for the examined structural system. Ambient vibration tests are then carried out on the same grandstand, and used to extract the natural frequencies and vibration modes of the system, according to conventional state-of-the-art output-only modal parameter identification techniques. A sensitivity investigation and FE model updating study is hence presented for the grandstand, giving evidence of the major influencing parameters and key input data for the numerical fitting of the experimental modal testing results.
Highlights
Introduction andState-of-the-ArtPublic facilities suitable to host lively events, where crowd motion is expected to induce significant dynamic loads, may suffer excessive vibrations during their life-time
The present study focuses on the experimental dynamic characterisation and on the FE model updating of a Reinforced Concrete (RC) stadium grandstand
Dynamic modal parameters ofagreement a RC stadium grandstand structuretest were and mode of thethe examined grandstand, with a good between the corresponding identified using test measurements of the structural response induced by a combined natural estimations
Summary
Public facilities suitable to host lively events, where crowd motion is expected to induce significant dynamic loads, may suffer excessive vibrations during their life-time. This is the case of stadium structures, where slender and light engineering solutions are frequently adopted, turning them highly susceptible to human-induced vibrations. A large number of references on structural response and vibration serviceability of stadium structural assemblies under human-induced live loads (see for example [3,4,5,6], etc.) highlighted that their dynamic response depend on basic mechanical features—i.e., geometry, mass and damping of a given structure—and on the nature of loading, which can become quite complex when moving crowd effects have to be considered. Especially for the design of stadium structures, it is highly recommended to consider the dynamic nature of moving loads induced by lively spectators [7]
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