الفهرس 
PAST STUDIES ON BUILDINGS CONTAINING TRANSFER FLOORSOnly 14 pages are availabe for public view
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Abstract
Behavior and response of structures under strong earthquake events are challenging topics. This is because the response of structures under earthquakes is typically exceeding the linearity limit. The assessment of seismic behavior of the structures has to be done considering that these structures have non-linear response. So, post-elastic analysis has to be applied. In-order-to study and develop the structure earthquake demands, the maximum nonlinear displacement demand have to be assessed carefully.
Structural weakness locations are positions of high potential for initiation of lateral force resisting system (LFRS) damage under earthquake ground motions. These weakness locations are leading for rapid structural degradation which may in most cases lead to complete collapse.
Sudden changes in the lateral stiffness of the structure at transfer floors conforming structural vertical irregularity along the height are proposed to be locations of weakness. This irregularity of mass distribution in vertical or horizontal planes can result in irregular and complex dynamic response of the structures under earthquakes.
The effect of transfer floors on dynamic response of high rise buildings was evaluated via parametric study. Multiple numbers of frame buildings with different height ranges; 15, 30 and 60 floors covering wide range of structural fundamental periods were considered in this study. These buildings were varying according to set of factors depending mainly on presence of one or two transfer floors located at different height locations; at Ground floor, lower third of building height, middle third, mid-height and upper third of the building height. Buildings’ members were designed taking effect of ACI [17] code over strength factor once and another time without it to test the importance of this code factor. The effect of using it or not using it on the results of analysis shall be done also on the structures. These buildings were analyzed using different pushover procedures to enlarge the degree of confidence in results confidence and to have good estimate for the measurements and the results. The dynamic response of these buildings were represented by three engineering parameters; Inter-storey drift ratio, base shear to weight ratio and plastic hinges’ locations associated with failure mode happening for the building. Then these results have been extracted for all case studies and have been represented in the form of comparisons for each result individually as this form will simplify the possibility of judgment.
The parametric study has been implemented on the buildings and results have been extracted for parameters and comparisons. Analysis of results yielded some set of conclusions representing the main trends and summary of the study. These conclusions have been extracted after peer review and analysis of the results.
from the conclusions and derivations of this study, set of recommendations have been introduced to engineers facing the issue of presence of transfer floors in buildings to avoid exaggeration of problems come out in this case. It also reveal some blind angles that might not be noticeable in case of elastic analysis.