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Shake Table Testing of Self‐Centring Concentrically Braced Frames
Author(s) -
Goggins Jamie,
Jiang Yadong,
Broderick Brian M.,
Salawdeh Suhaib,
O'Reilly Gerard J.,
Elghazouli Ahmed Y.,
Alwahsh Hatim,
Bogdanovic Aleksandra,
Rakicevic Zoran,
Gjorgjiev Igor,
Poposka Angela,
Petreski Borjan,
Markovski Igor
Publication year - 2021
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.1508
Subject(s) - bracing , earthquake shaking table , centring , structural engineering , braced frame , shake , engineering , buckling , displacement (psychology) , compression (physics) , residual , brace , frame (networking) , computer science , materials science , mechanical engineering , psychology , algorithm , composite material , psychotherapist
The self‐centring system presented in this paper is a novel damage control technique designed to improve the resilience of concentrically braced frames (CBF) under seismic action. Namely, traditional CBFs can undergo large residual drifts following an earthquake event which can limit the opportunity for cost‐effective repair of the structure. Additionally, the gusset plates connecting the brace members to beams and/or columns can experience substantial rotations as a result of the compression buckling of the bracing members. Through the utilisation of post‐tensioning strands placed between flanges of beams, the novel self‐centring concentrically braced frame (SC‐CBF) system can return the frame to its original position after significant inelastic deformations experienced during large earthquakes, resulting in minimum residual drifts. In this paper, shake table testing of the aforementioned SC‐CBF system subjected to realistic earthquake loading is presented. The research is carried out as part of the H2020 “Seismology and earthquake engineering research infrastructure alliance for Europe” SERA project. Four sets of bracing configurations, incorporating varying square hollow section (SHS) braces and gusset plates were utilised in the shake table testing. Uniaxial loading with varying shake table accelerations was executed and the structural response evaluated using data from strain gauges (SG), load cells (LC), displacement transducers and accelerometers. The measured results provide information on the important parameters such as the tensile and compressive strength of the braces, post‐buckling capacity, gusset plate strains and post‐tensioning force. These findings are then presented and the crucial local and global response performance emphasised.