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Linear and Nonlinear Analysis of a High-rise Building Excited by Earthquake: Lineær og ikke-lineær analyse av høyhus utsatt for jordskjelveksitasjon
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Civil and Transport Engineering.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

The purpose of this thesis is to evaluate the linear and nonlinear response of a high-rise building located in Norway. The Oslo Plaza building, located in Oslo, has been chosen for this purpose. A finite element model of the structure was created in the structural analysis program SAP2000 with emphasis on representing the nonlinear behavior as correctly as possible. Modifications of ground motion data was performed to better represent a typical earthquake in a Norwegian environment, and the seismic response of the building was investigated using several different analysis methods. Oslo Plaza was found to behave linearly for earthquakes with an expected return period of 475 years, while for a 3000-year earthquake major nonlinear effects are expected to occur especially in the longitudinal direction. Oslo Plaza should however still not collapse during an earthquake of this size, even though it is expected to experience permanent deformations. While dimensioning high-rise buildings for 475-year earthquakes the response spectrum method described in EC8 was found to be adequate. For most engineering firms this is by far be the easiest method for analysing a high-rise building considering its simplicity and the fact that nonlinear direct integration time history analyses require significantly more computational power and calculation times. An interesting point found during the work with this thesis is that the swimming pool located in the top-stories of Oslo Plaza might work as a tuned liquid damper during the building’s linear seismic response. This damping effect was found to have the potential to be significant if the dimensions of the swimming pool had been altered by only a few meters. Keywords: Ground-motion; High-rise structure; Oslo; Nonlinear; Tuned liquid damper; Dynamic analysis

Place, publisher, year, edition, pages
Institutt for konstruksjonsteknikk , 2014. , 132 p.
URN: urn:nbn:no:ntnu:diva-26397Local ID: ntnudaim:10841OAI: diva2:747475
Available from: 2014-09-16 Created: 2014-09-16 Last updated: 2014-09-16Bibliographically approved

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