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.