Numerical analysis method for evaluating response modification factor for steel structures equipped with friction damper
- PDF / 2,648,318 Bytes
- 18 Pages / 595.276 x 790.866 pts Page_size
- 97 Downloads / 188 Views
ORIGINAL PAPER
Numerical analysis method for evaluating response modification factor for steel structures equipped with friction dampers Adel Sadeghi1 · Gholamreza Abdollahzadeh1 · Hamid Rajabnejad1 · Seyed Abolfazl Naseri1 Received: 12 May 2020 / Accepted: 20 October 2020 © Springer Nature Switzerland AG 2020
Abstract The structural response modification factor (R) is a parameter, which determines the performance of a structure in a nonlinear range during strong earthquakes. Hence, in the previous research, the effect of viscose dampers on the coefficient of structural modification has been measured. In this research, the effect of friction dampers on the R factor in steel structures with regard to traditional and advanced methods of nonlinear static analysis has been investigated. With the development of the application of pushover analysis, in recent years, several advanced pushover methods have been proposed to consider the realistic behaviors of structures, including the effect of higher modes or the effect of changes in the structural modal characteristics during the analysis owing to the yielding of members. Therefore, the adaptive pushover analysis was used to consider the impact of near- and far-field records. In general, the factors affecting the R factor are distinguishable from the following two perspectives: strength and ductility. Structural analysis has been carried out by the finite element method and by taking into account the nonlinear method of the members in an extended fiber section method, with and without frictional damper in different places and positions. The results show that in particular the R factor has increased 52.45% on average, under different conditions. Therefore, using the results of numerous cases and the application of dampers with different slip loads and the variable number of dampers in each story, a new equation (Rd) is proposed for the R factor of structures along with a friction damper (slip force, number of story, and bay of equipped with damper). Keywords Response modification factor · Adaptive pushover · Ductility factor · Over-strength factor · Friction damper
Introduction An earthquake is a natural disaster that puts a lot of human life and property at risk. An earthquake is not dangerous in itself, but danger to human life is posed by non-safety structures built by man himself. Structural design loads (dead load, live load, snow load, etc.), if applied to the structure designed according to the codes, causes elastic or close elastic behavior in structural elements. Seismic design regulations have a unique feature in comparison to other design regulations because seismic design regulations are allowed to consider the structure designed to be under a design-based earthquake (DBE) and enter a range of non-linear behavior and damage-controlled in the permitted range. The prediction of earthquake codes is that the designed structure
* Gholamreza Abdollahzadeh [email protected] 1
Babol Noshirvani University of Technology, Babol, Iran
tolerates a great ea
Data Loading...