چكيده به لاتين
The main purpose of seismic design is to protect human life by predicting repairable structural damage due to earthquakes. Experience from recent earthquakes - such as Northridge, Kobe and Taiwan - has shown that the new regulations are relatively reliable in areas with high seismicity to prevent earthquake hazards. But these earthquakes caused unacceptable economic losses, so repairing the damage to many buildings was very costly. Therefore, in this study, in order to study and design concrete flexural frame structures equipped with viscous dampers by DDBD method, 3 building frames of 4, 8 and 12 floors with concrete flexural frame system, which in this research is to be the desired frames with both Analyze and design the force method (2800 standard) and the direct displacement-based design method (DDBD). In addition, the samples will be analyzed in two modes without dampers and with linear viscous dampers (FVD). After gravity loading, the samples will be subjected to nonlinear static loading (folder) and nonlinear dynamic time history analysis (under 7 earthquake accelerometer) in accordance with Section 6. Also, 360 publication has been used for increasing analysis (folder) and assigning plastic joints to frame members. ETABS software was used to analyze and design the samples. As can be seen, by adding viscous dampers to the frames, the desired samples have been able to have a more desirable level of performance. As can be seen, the amount of lateral displacement has been drastically reduced by adding a damper to the frames. It can also be seen that the dampers have been a great help to withstand the applied shear force. By comparing the two design methods by DBDD method and 2800 earthquake standard, it can be seen that DBDD design can lead to the construction of a structure with a more appropriate level of performance than the analysis and design using 2800 earthquake standard. As seen in DBDD design, while reducing the amount of residual deformation in the frame, fewer plastic joints have reached their breaking point. Also, in the structural design method using the DBDD method, the frames were able to spend the entire duration of the earthquake and in some earthquakes longer than the analysis and design by the standard 2800 method. This is also seen in folder analysis. In the structural design method, the frames have been able to withstand more displacement in the center of mass of the roof.
