Abstract
In the most of regulations, reduction factor of seismic force depends only on the kind of lateral loading system, but research has shown that this factor is a function of many factors such as period and modal characteristics of the structure, the height and especially form of plan in the building. Due to the complexity of nonlinear dynamic analysis method, today, nonlinear static analysis method called pushover, as a practical appropriate tool has developed in field of earthquake engineering based on function frequently. But traditional pushover analysis method have defects that can be noted Including the stability of lateral load pattern form, did not consider the impact of higher modes or impact of more efficient modes and lack of consideration of the stiffness matrix of member or the entire of structure changes in step of analysis. In recent years a number of researchers have proposed using adaptive load pattern, in this methods, lateral load pattern have changed and adapting in during analysis based on momentary stiffness matrix of structures. In this paper we investigate the response modification factor in L-shaped geometric asymmetry by using SAP software, Pushover analysis used in this study is divided into two categories pushover with constant load pattern (traditional method) and pushover with the adaptive load pattern (adaptive). So, it is studied building with L-shaped asymmetrical plan, with moment frame double structural system - bracing and number of floors 5, 10, 15 and 20, with four different bracing plan types at considering frames, and the end were compared obtained response modification factor from the two methods for these buildings.
Highlights
Structures in during of earthquakes have non-linear behavior, and a considerable amount of input earthquakes energy waste in the form of damping energy and solid waste
Bagheri and Tayari did a research at Tabriz university in 2017 titled response modification factor and displacement amplification factor (DAF) incriminate moment steel frame which it’s response modification factor and its effective factors and used displacement amplification factor in fourth edition of 2800 of Iran’s Standard for medium moment steel frame were evaluated, and in this study the researcher had used FEM-P645 approach
Frame two-dimensional 3, 6 and 2 floor had 3, 5 and 7 mouths which were designed based on Iran’s standard, using pushover analysis the results showed that with existence of pall friction damper in dual system steel structures with convertible bracing, the response modification factor value was improved up to 100%
Summary
Structures in during of earthquakes have non-linear behavior, and a considerable amount of input earthquakes energy waste in the form of damping energy and solid waste. In American codes and regulations, such as uniform building regulation (UBC 1997 NEHRP 2000 or 1997 regulations and FEMA 273) to (R) correction factor of response, in the National Building regulation of Canada as a correction factor for the force, in the SEAOC 1988 regulation called the functional factor of the system (Rw), in the European Regulation called the response modification factor (q), in loading standard of the New Zealand as ductility. The suggested methods in FEM-P645 for evaluating structural performance parameters had better correlation with abovementioned modification factor in 2800 standard for medium moment frames
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