Page 129 - Çevre Şehir İklim İngilizce - Sayı 4

Cenk Alhan - Mert Hacıemiroğlu

For making the calculations in 4th, 5th and 6th steps given above, it is
necessary to establish and analyze three different structural models for (i)
upper limit values, (ii) lower limit values and (iii) nominal values of the isolator
parameters.
Considering that the calculations will be made for 11 earthquake record sets,
each one having two horizontal and one vertical components, the greatness of
analysis load will be better understood. Another aspect affecting the project
duration is that it is mandatory to control the isolator parameters considered
in the design by Prototype Tests, and to confirm that the variability based on
the isolator production remains within the limits considered in the design by
Production Control Tests. The vertical load, horizontal displacement, horizontal
force, number of cycles, test duration and acceptance conditions to be used
for prototype and production control tests are given in detail in TBDY (2018).
Again, according to the regulation, these tests must be conducted under the
supervision and control of the design engineer. TGUA-5 should also participate
in the tests and evaluate the results.

1. Behaviour of a Sample Seismic Isolation Building Model Under the Near-
Fault and Vertical Earthquake Impact

1.1. Sample Seismic Isolation Building Model
In this section, a sample seismic isolation building model is introduced,
which will be examined in the next section. This building was obtained by
removing the core shear system and basement floor of a sample reinforced
concrete 6-storey hotel building created by Polat et al. (2018), and by adding
an isolator floor slab and installing a curved surface friction pendulum isolator
under each column. In addition, reinforced concrete foots with dimensions
of 150 cm × 150 cm × 150 cm were formed on the raft foundation, where
the isolators will be placed. There are a total of 8 and 4 axles in the X and Y
directions, respectively, and the axle openings are 8 m. A total of 32 curved
surface friction pendulum isolators are used in the building with the plan
dimensions of 56 m × 24 m and the floor heights of 3.5 m, and the total height
of the building located on the isolation interface is 21 m. The 3D finite element
model view of the building is given in Figure 8(a). Typical column dimensions
in the superstructure consisting of reinforced concrete frame and reinforced
concrete beam slab transferring the moment bearing system are 70 cm x 70 cm
on the first floor and 60 cm x 60 cm on other floors, typical beam dimensions
are 60 cm × 75 cm and reinforced concrete floor slab thickness is 20 cm.
Columns and beams are modeled as rib elements, floors as shell elements,
and insulators as “Link” elements. The superstructure and infrastructure are
modeled in linear, and the insulation system is modeled in a non-linear way.

118 The Journal of Environment, Urban and Climate