## 4 Conclusions and Recommendations  
The level of destruction of structures during earthquakes usually depends on the interaction between the earthquake, the ground, and the structure. Correct analysis of these factors can help to predict the seismic performance of structures during and after the earthquake more realistically. Although it is difficult to determine the earthquake risk of any region precisely today, regional earthquake hazards can be statistically evaluated with seismic hazard analyses. In order for these analyses to yield accurate and realistic results, local ground conditions in particular must be evaluated in detail. Because earthquakes usually start on the ground, it is known that local ground conditions play a critical role in determining the characteristics of the earthquake. Local ground properties can directly affect the seismic performance of structures; therefore, it is important to consider these factors in structural analyses. When the results of large and destructive earthquakes that have occurred in the world and in Turkey are examined, it is observed that the damage rates due to ground conditions are increasing. This situation is mostly due to the increase in the plain settlements of the cities and the observation of the basin effect more in the structures related to this, the ignoring of the ground amplification effect in loose soils, the effect of seismic waves originating from topographic irregularities on the structures from different angles, the bearing capacity changes due to the differences in groundwater levels and the effects of nearby faults. Although liquefaction potential is a concept that can be determined in advance, it causes permanent deformation in the structures especially in the soils that have not been improved against liquefaction in old settlements during earthquakes. This study examined the local soil conditions affecting the earthquake performance of the structures in detail through seven different variables. For example, while the local soil conditions were determined as the first variable in the selected RC structure model, other factors such as damping ratio, structure importance class, earthquake zone, ground floor height, number of floors, frame opening, and floor height were also taken into account. The results of the static pushover analyses performed separately for each structure model were obtained to understand the seismic performance of the structures. All the quantitative results obtained once again revealed that the local soil conditions significantly affect the performance of the structures in a possible earthquake. For this reason, it is clearly emphasized that local ground conditions should be known realistically in seismic performance assessments and designs to be made on new and existing building stock. Determining local ground conditions with detailed analyses may allow for more realistic damage estimates and distributions of structures. In cases where ground properties are poor, ground improvement and reinforcement works can be carried out with different methods or superstructure construction can be continued by selecting different foundation types. This study reveals that structural analyses conducted by considering the interaction of various parameters with local ground conditions emphasize the importance of design. It has been observed that structural irregularities negatively affect the seismic performance of structures. The study focuses especially on regular reinforced concrete building models and may constitute a source for similar studies for irregular structures and different load-bearing systems. Many parameters have important effects on the design and evaluation of structures. In this context, it is necessary to consider these parameters and their interactions in terms of performance-based earthquake engineering.