Detailed seismic modelling of portal RC frames with precast beams connected by pocket joints at the upper column ends

Enrique Martinez-Rueda, Oday Al-Mamoori

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBN

Abstract

Past research works and post-earthquake field missions have revealed the vulnerability of a number of portal RC frames made of precast RC members using pocket connections to join beams and columns. Typically the beam-column joint in these frames is assumed for analysis purposes as a simple pinned joint so that relative translations between beam and column ends are neglected while allowing the free rotation of these ends; however this assumption cannot always be justified, particularly when slippage at the beam seat can occur or when the beam ends make contact with the back walls of the pocket connection as a result of slippage and relative rotations of the beam with respect to the column. Furthermore, modelling the above connections as pinned joints does not allow the assessment of beam seat loss as a possible cause of collapse. This article introduces a new approach to model the nonlinear response of the above joints accounting for the kinematics of the problem as well as material nonlinearities. To that effect the joint is modelled by an assembly of gap elements, frictional joints, rigid links and nonlinear fibre elements. A series of nonlinear inelastic time-history seismic analyses of precast RC portal frames of existing industrial buildings are included in the study. Results demonstrate the ability of the new model to predict both the frictional sliding at the beam seat region and the pounding between the beam and the back wall of the pocket connections.
Original languageEnglish
Title of host publicationProceedings of the 5th International Conference on Earthquake Engineering and Seismology
Place of PublicationMETU, Ankara, Turkey
Pages1-9
Number of pages9
Publication statusPublished - 8 Oct 2019
Event5th International Conference on Earthquake Engineering and Seismology - METU - Middle East Technical University, Ankara, Turkey
Duration: 8 Oct 201911 Oct 2019
Conference number: 5
http://5icees.com

Conference

Conference5th International Conference on Earthquake Engineering and Seismology
Abbreviated title5ICEES
CountryTurkey
CityAnkara
Period8/10/1911/10/19
Internet address

Keywords

  • seismic response of precast RC frames
  • beam-column pocket connection
  • beam seat loss

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