Numerical comparison of the strengthening of a reinforced concerete building by seismic isolation and conventional method

In this thesis, performance based analiysis was performed on three (3)-storey available public building which located in the district of Tuzla, İstanbul, use student dormitory and was desined by using 1962 Earthquake Code. The scope of 2018 Türkiye Building Earthquake Code (2018 TBEC), three dimension (3D) numerical model of building which use time history non linear analiysis was created ETABS program. Two apart retrofitting methods were proposed for the available public structure that has a performance level of colapse. In the first method, it proposed to add new structual elements (strengthened with the reinforced concrete shear wall). In the second method, the use of seismic isolator was recommended to isolate the structure from the ground vibrations. It has been determined that there are significant reductions in dynamic parameters such as base force, story force, story accelerations and interstory drifts compared with double-surface friction pendulum type seismic isolators to reinforced concerete buıldıng by conventional method. The available building and retrofitting building models were created taking into account the DD-1 with DD-3 eartquake level required by non lineer analysis. In the scope of "Turkey Building Earthquake Regulation (2018): Chapter 15 - Evaluation of Existing Building System Under the Influence Seismic Loads", structure was determine based Comprehensive Knowledge Level. The properties of the concrete and steel materials used are calculated according to the sample results taken with destructive and non-destruvtive method from the available building. Within the content of deformation-based design, the numerical model according to the nonlinear behavior of the building was created with the concentrated plasticity hinge model in beams and columns. Distributed plasticity hinge model based on shear walls. M3 moment hinge was appoint the ends of the beams, the P-M2-M3 hinge which can fıgure on normal force interaction was figure on columns. XTRACT program is used that create moment-curvature relations of column and beam sections. The plastic rotation values were calculated for Collapse Prevention (CP) with Life Safety (LS) performance limits. When Nonlinear Time History Analysis (NTHA) method was calculate, The horizontal earthquake acceleration records to be used in the analysis corresponding to the design earthquake ground motion level were choose from the real earthquake records in the Pacific Earthquake Engineering Research Center (PEER) database which act on the earthquake magnitude, the source mechanism, local site class and the distance to the fault that. The simple scaling method in TBEC-2018 was performed by Seismo-Match program. As a result, eleven ground motion acceleration pairs were affected on the building by changing their directions. When the structure with double-surface friction pendulum type seismic isolator modelled, In the scope of "Turkey Building Earthquake Regulation (2018): Chapter 14 Evaluation of Seismic Isolators Under the Influence Seismic Loads, structure was determine at Comprehensive Knowledge Level, Isolation unit added systems was based on by non-linear time-history analysis with using earthquake records that scaled according to design earthquake level (DD-2) with max earthquake level (DD-1) acceleration spectrums defined. The pre-designing of the double-surface friction pendulum type seismic isolator which is going to be used in the structure was made, after the insulation parameters which are planned to be used in the model were obtained and the models were formed within the direction of these data. Earthquake parameters were achieved from AFAD Turkey Earthquake Hazard Maps Interactive Web Application. Elevan ground motion acceleration sets by changing their 3 directions were choosed from the PEER database, which are appropriate for the horizontal acceleration spectrum calculated for the DD-1 with DD-2 earthquake ground motion levels.