Evaluation of Behavior Factors Converged Crossover Braced Frames under Triangular Loading Pattern

The lateral load distribution pattern reflects the distribution of lateral inertial forces applied to the structure caused by the earthquake. Inertial forces caused by earthquakes with time changes and dynamic characteristics of the building are subject to change. But in the non-linear static analysis in order to avoid the complexity of this method, forces during analysis are considered constant. Hence analysis and design codes suggest different lateral load patterns to minimize the impact of this unrealistic simplicity. Pushover analysis is of non-linear static analysis methods that can be used to obtain structural capacity curve. Effective factors in determining the capacity curve of the structure is the lateral load distribution. This paper examines the triangular lateral load pattern in structures with convergent bracing previously placed under linear static analysis and a threedimensional frame structure as an example was analyzed in the SAP2000 software. Therefore pushover analysis was performed on the several frames with convergent crossover braces (with 3,5,7,10,15 number of floors) and extra strength values, ductility and behavior factor is obtained and he results are compared with a nonlinear time history dynamic analysis. Also effect of the parameters affecting the rate of behavior such as, Iranian and American sections of beams and columns, double stud sections, will be examined for braces.

کلیدواژه ها:

Force reduction factor ، behavior coefficient ، nonlinear static analysis ، the triangular load patterns ، convergent braces