طراحي عملكردي سازه ها براساس كنترل خسارت لرزه اي براي سازه¬هاي با قاب خمشي فولادي ويژه

چكيده انگليسي :

Performance based design of structures based on seismic damage control for structures with special steel moment frame Ali Hoseini Rad alihoseinirad1872@gmail com Date of Submission October 20 2020 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Dr Farhad Behnamfar Farhad@cc iut ac irAbstractGenerally seismic design of structures can be conducted through disparate methods including code based method and performance based ones The performance based design PBD methods are directly e g damage controlled seismic design method DCD or indirectly e g displacement based design DBD pertinent to the damage concept As for the seismic design of structures using the force baseddesign FBD well known as a simple and time saving method the earthquake phenomena is takeninto account equivalent to horizontal static load Through the using of PBD methods including DBDand DCD and defining new levels of performance a novel framework will be introduced within thefield of structures seismic design Considering the DBD method a maximum drift with regard tostructure s level of performance is taken into account and then the structure would be substituted witha single degree of freedom system SDOF Afterwards the structure will be designed using the baseshear calculated with the equivalent stiffness and damping More to DCD method it is feasible to designthe structure on the basis of global and local damage index by which the structure s damage level wouldnot exceed the considered limit Throughout this study a new method named as damage controlled seismic design has been developedand elaborated in details Through the usage of this method in the first place modified Park and Angdamage index which is based upon the relation of deformation and energy has been transformed intoa drift based damage index using regression and several analysis Having an appropriate driftdetermined from the damage index its base shear will be calculated in the considered level ofperformance In this study firstly the 4 8 12 storey structures respectively representing low rise medium rise and relatively high rise buildings within the zone of soil type D are designed in ETABSsoftware in accordance with ASCE 7 16 code Thereafter these structures are modelled in OpenSeessoftware by the exploitation of concentrated plasticity method to perform non linear dynamic analysis By the end of design process using disparate earthquake accelerogram and repeating non linear dynamicanalysis in OpenSees it has been concluded that the damage index would remain within the consideredlevel of performance In addition the proposed method provides a deep understanding of structure snon linear behavior in the course of earthquake More to present study a comparison has been drawn between DCD and FBD methods by which it hasbeen inferred that for DCD method the base shear force in 4 8 and 12 storey buildings are respectively8 95 6 11 and 6 03 less than FBD method and provide softer structures with higher periods Itshould be highlighted that these given values are pertinent to damage index of 0 4 and in case of lowerdamage index the base shear force is increased and thereby the structure would be designed heavier To make this distinction clearer having the structures designed with 0 2 damage index a comparisonhas been made between the damage index results of 0 2 and 0 4 The drawn comparison reveals that thebase shear forces of damage index 0 2 for 4 8 and 12 storey buildings are respectively 23 2 15 65 and 16 55 more than damage index 0 4 By an increase in the base shear force values the structuralelements and structure s stiffness are enlarged and consequently the maximum inter storey drift isdiminished Keywords Damage controlled seismic design Park and Ang damage index Drift non linear dynamicanalysis steel moment frame

حسيني راد، علي

طراحي عملكردي سازه ها براساس كنترل خسارت لرزه اي براي سازه¬هاي با قاب خمشي فولادي ويژه

طراحي بر اساس كنترل خسارت , شاخص خرابي پارك و انگ , دريفت , تحليل ديناميكي غيرخطي , قاب خمشي فولادي