Paper Details

This paper presents comparative study of seismic design considerations and design methodologies for steelconcentrically braced frame by force based design and performance based plastic design method. Force based design isthe design method, which is currently used in India for design of structure in elastic state of material. PerformanceBased Plastic Design (PBPD) method has been recently evolved from the Performance based seismic design (PBSD) toachieve enhanced performance of earthquake resistant structures considering the participation of inelastic state of thematerial. The concept of design is mainly based on pre-selected target drift and yield mechanism as performancecriteria. Performance Based Plastic design depends on “strong column-weak beam” theory, in which the pattern offailure is pre-determined. CBFs, when designed by conventional elastic design methods, these structures can undergoexcessive story drifts after buckling of bracing members. That can lead to early fractures of the bracing members,especially in those made of popular rectangular tube sections. A brief study on recently developed energy based plasticdesign methodology for CBF with buckling type braces is presented in this paper which exhibit somewhat “pinched”hysteretic loops.

Chokshi H K, Vaidya K K, Dalal S P, “Comparison of Force-Based Design Method and Performance-Based Plastic Design Method for Seismic Design of Steel Concentric Braced Frames”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 4, Issue 13, pp. -, January 2017.