Abstract
This paper introduces a review of self-centering steel frame systems for seismic-resistant structures. The components and basic mechanisms of the developing posttensioned connections and self-centering braces are briefly introduced. The structural details and seismic behaviors of the self-centering systems proposed in recent years, including connections, energy dissipating braces, and steel frames, are condensed in categories. The theoretical and experimental results indicated that self-centering action could minimize residual deformation and structural damage. The energy dissipating capability of the self-centering systems is greatly enhanced by the application of energy dissipating device. The shape memory alloys (SMAs) and prepressed springs which exhibited great potential in energy dissipation and recentering capability have been studied increasingly in recent years. Abundant numerical models were propounded to investigate the cyclic response of these self-centering systems. The current research challenges and the critical issues which need further study are discussed at the end of this paper.
Highlights
Components and MechanismsE strands provide tension force for the connection to implement the self-centering capacity
E previous studies have confirmed the satisfying properties of self-centering systems, such as the following: (1) they avoid the use of field welding; (2) the stiffnesses of these connections are similar to those of soldered momentresisting connections; (3) these connections are made with conventional materials and skills; (4) these connections are self-centering, which can significantly decrease or even eliminate residual drift; (5) the connections can localize damage, allowing easy repair following an earthquake; (6) the component dimensions and the complexity of structural skills of the self-centering steel moment-resisting frames (SC-MRFs) are similar to those of the MRFs with the welded connections. erefore, the self-centering systems can be a practical alternative to the conventional frame systems
With the increase of the applied moment, the energy dissipation (ED) components are yielding at event 2, and the PT strands are yielding at event 5. e connection stiffness of event 3 to event 5 is approximately constant, which mainly depends on the elastic stiffness of the PT strands
Summary
E strands provide tension force for the connection to implement the self-centering capacity. E ED device dissipates energy and assists in resisting shear force and moment. Unloading at event 4, the gap will eventually close restrained by the tension force in strands (event 8). Other types of self-centering connections with the different energy dissipating devices and self-centering components work . E self-centering braces that consist of bracing members, self-centering elements, and ED devices are innovatively proposed and applied to steel MRFs to reduce drift and dissipate energy.
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