Akademik Veri Yönetim Sistemi
International IDU Engineering Symposium – IES’20 , İzmir, Türkiye, 5 - 13 Aralık 2020, cilt.1, sa.1, ss.1-10
Industrial
development has accelerated throughout the world since the early 1900s. Within
this period, many industrial buildings have constructed with precast structural
elements produced in the factory environment. Precast structures, which greatly
contribute to industrial and economic development, are one of the important
civil engineering structures. Due to the advantages provided by prefabricated
buildings in various perspectives such as usage and quality, the majority of
industrial buildings in our country consist of one-story RC precast structures.
In past earthquakes, it has been observed that the existing prefabricated
structures suffered critical damages due to weakness such as weak junction
points, insufficient diaphragm behavior, insufficient strength, and rigidity.
These situations raise the idea of comprehensively investigating the seismic
performances of prefabricated structures.
Various methods
are used to evaluate the seismic performance of the structures. The time
history analysis method is widely used by researchers and designers. In this
method, the use of various ground motion records and a detailed structure model
allows the results to contain smaller errors compared to other calculation
methods. However, the seismic responses of the structures are very sensitive to
the properties of the selected ground motion records. Therefore, appropriate
ground motion records should be selected for reliable analysis results.
When the ground
motion records in a region are examined, it can be seen that there are
differences between the near-fault ground motion and far-fault ground motion.
Near-fault ground motions contain large velocity signals and apply great energy
to the structures in the region at the earthquake. This energy can lead to
serious damage to structures. On the other hand, the fault mechanism affects
the characteristics of the near-fault ground motion, and the ground motion
records may include large-period and high-amplitude pulse effects. These
effects can dramatically increase damage levels in structures. It has been
determined by the researchers that the effects of near-fault ground motion in
1971 San Fernando, 1994 Northridge, 1995 Kobe, 1999 Kocaeli and Düzce
earthquakes increase the damage levels in the structures. Therefore, these
effects should be considered in the design and analysis of the structures.
In this study, the seismic
performance of a single-story reinforced concrete prefabricated structures
exposed to near-fault ground motions is evaluated. The finite element model of
the selected prefabricated structure is constituted by using the SAP2000
program and the nonlinear time history analyses are performed. The near-fault
ground motion sets with and without pulse effect are used in the analyses. In
the selection of pulse-like ground motions, the acceleration records with the
ratio of the pulse period to the first natural period greater than 1 are used. Thus,
ground motions with large pulse period are taken into account in the analysis.
The plastic rotations and internal forces of precast columns, peak
displacements, and base shear forces are used as comparison parameters.
Analysis results show that near-fault and pulse-type ground motion effects
should be considered in the design and analysis of precast structures.