Stiffness assessment of bolted beam-to-tubular column joints through modal data

  1. Miguel A. Serrano-Lopez 1
  2. Marta García-Diéguez 1
  3. Jose L. Zapico-Valle 1
  4. Carlos Lopez-Colina 1
  5. Miguel Lozano 1
  1. 1 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

Actes:
Proceedings of the 17th International Symposium on Tubular Structures (ISTS17)

Editorial: National University of Singapur

ISBN: 978-981-11-0745-0

Any de publicació: 2019

Pàgines: 619-626

Congrés: 17th International Symposium on Tubular Structures (ISTS17)

Tipus: Aportació congrés

DOI: 10.3850/978-981-11-0745-0_015-CD GOOGLE SCHOLAR

Resum

Although beam-to-tubular column joints are mostly welded instead of bolted because the difficulty to access to the inside of tubes, the use of threaded studs welded to the tube front face of rectangular hollow sections could avoid this problem and allows removable joints to be used. An important issue of these connections is the characterization of their rotational stiffness. A research on bolted I beam-to-tubular column joints using welded threaded studs, which proposes a new methodology to obtain the joint stiffness from modal data, is presented in this paper. The studied joints include angle cleats connected to the beam flanges with standard bolts and to the column face with welded threaded studs. A simplified finite element model comprising beam elements has been developed to reproduce the dynamic behavior of this kind of connections. The model is updated by minimizing the discrepancies between the analytical and experimental natural frequencies. The experimental frequencies were obtained through modal impact tests. The initial rotational stiffness, which is an essential parameter to characterize semi-rigid joints, can be easily obtained from the updated model. On the experimental side, the proposed procedure just needs a portable analyzer and an accelerometer. The goodness of the model has been validated with experimental monotonic tests and results are really promising.

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Informació de finançament

The authors would like to acknowledge the Spanish Ministry of Economy and Competitiveness for their financial support under Project BIA2017-83467-P and the CIDECT for their support under project 5CF.

Finançadors

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