A master thesis from Aalborg University
Earthquake Design - Response assessment of steel structures under earthquake effect
Author(s)
Term
4. term
Education
Publication year
2020
Submitted on
2020-06-10
Pages
139 pages
Abstract
The aim of this project is to design and investigate the behaviour of a steel structure under earthquake effect. For this purpose, four different methods according to EC8 are used. First, the design of the structure is implemented. The structure is simulated by use of the commercial finite element software Robot and a modal analysis is applied. Moreover the structural regularity criteria are investigated. Then, two linear elastic analysis are performed: Modal response spectrum analysis and Equivalent static method of analysis. The two methods indicate a large difference to their outputs. Modal response spectrum is considered to be more accurate. Therefore, the design of the structure is implemented according to this method. Second, the response assessment of the building is implemented by means of nonlinear analysis. The finite element software Seismostruct is used for both static and dynamic time history analysis. The static nonlinear analysis determines the capacity curves of the structure for both principal horizontal directions. Additionally, the dynamic nonlinear analysis is implemented by use of three different accelerograms. Accordingly, the structural responses are evaluated by means of structural displacements and plastic deformations. Finally, the base isolation concept is investigated. Elastomeric bearings are added to the model and dynamic nonlinear analysis is implemented. A comparison between base isolated and fixed base structure’s results is performed.
Keywords
Documents
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