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Title: Seismic design procedure for steel moment resisting frames with viscous dampers
Author: Kariniotakis, Konstantinos
ISNI:       0000 0004 6496 786X
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2017
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Modern technologies for seismic hazard mitigation in building structures, such as passive dampers, make it possible to design economically viable buildings that (a) experience significantly less damage than conventional buildings designed according to seismic codes; and (b) return to service within an acceptable short, if not immediate, time after a strong earthquake. The latter is of significant importance as recent strong earthquakes resulted in high socio-economic losses due to long disruption of the use or occupation of a large number of buildings. Among the different types of passive dampers available in the market, fluid viscous dampers are known for their major advantages including large capacity of energy dissipation and peak forces that are out of phase with the peak drifts of elastic or mildly inelastic structures. Steel moment-resisting frames (MRFs) with viscous dampers are prone to plastic mechanisms that involve hinges in columns because of the large column axial forces due to the large damper forces and have less collapse resistance than conventional steel MRFs designed for the same drift performance under the design earthquake. In this research, a seismic design procedure for steel MRFs with viscous dampers within the framework of Eurocode 8 is developed, addressing the issues of (a) the satisfaction of a sway plastic mechanism with plastic hinges in beams and column bases and (b) collapse resistance of steel MRFs with viscous dampers at least equal with that of conventional steel MRFs. A conservative design rule is proposed for the capacity design of the columns in the force path of viscous dampers. More specifically, the column axial force used to perform the capacity design is the envelope of the axial force from the peak drift state and the axial force from the peak velocity state. The capacity design rule becomes stricter for buildings with more than 10 storeys to address that linear elastic analysis methods for structures with dampers underestimate the peak damper forces in the lower storeys of yielding tall steel MRFs. Appropriate limit values for the storey drift sensitivity coefficient θ are recommended to guarantee for steel MRFs with viscous dampers collapse resistance at least equal with that of conventional steel MRFs.
Supervisor: Not available Sponsor: Engineering and Physical Sciences Research Council
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TA Engineering (General). Civil engineering (General)