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<https://discovery.ucl.ac.uk/id/eprint/10087625> <http://purl.org/dc/terms/title> "Rocking Damage-Free Steel Column Base with Friction Devices: Design, Numerical and Experimental Evaluation"^^<http://www.w3.org/2001/XMLSchema#string> .
<https://discovery.ucl.ac.uk/id/eprint/10087625> <http://purl.org/ontology/bibo/abstract> "Conventional seismic-resistant structures, such as steel moment resisting frames, are designed to experience\r\nsignificant inelastic deformations under strong earthquakes. Inelastic deformations result in damage of structural\r\nmembers and residual interstory drifts, which lead to high repair costs and disruption of the building use or\r\noccupation. The aforementioned socio-economic risks highlight the need for widespread implementation of minimaldamage structures, which can reduce both repair costs and downtime. Examples of such structures include steel\r\nframes equipped with self-centering beam-column connections, structural fuses, passive energy dissipation devices,\r\nself-centering braces, and others. These earthquake-resilient steel frame typologies have been extensively studied\r\nduring the last decade but little attention has been paid to the behavior of their column bases. Conventional steel\r\ncolumn bases are susceptible to experience non-repairable damage significantly affecting the resilience of the entire\r\nstructure. The present paper presents an innovative rocking damage-free self-centering steel column base and\r\nsummarize the results of the analytical, numerical and experimental studies. The proposed column base uses posttensioned high strength steel bars and friction devices respectively to control the rocking behavior and to dissipate\r\nthe seismic energy. The moment-rotation behaviors of the proposed column base can be easily described by using\r\nsimple analytical equations allowing the definition of a design procedure for the calibration of the main design\r\nparameters with the aim of achieving the damage-free behavior, the self-centering capability and an adequate energy\r\ndissipation capacity. A three-dimensional non-linear finite element model of the column base was developed in\r\nABAQUS in order to investigate the local behavior of the components, to validate the moment-rotation analytical\r\nequations and to demonstrate the efficiency of the design procedure. On the other hand, a simplified model for the\r\ncolumn base was developed in OpenSees and allow to investigate the effects of the proposed column base on a case\r\nstudy building. Nonlinear dynamic analyses show that the rocking column base fully protects the first story columns\r\nfrom yielding and eliminate the 1\r\nst story residual story drift without any detrimental effect on peak story drifts. In\r\naddition, an experimental campaign under monotonic and cyclic load protocols allows to calibrate the numerical\r\nmodels and further confirms the damage-free behavior and the high potentials of the proposed column base to be\r\nused in the design of highly resilient steel structures."^^<http://www.w3.org/2001/XMLSchema#string> .
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