Evaluation of Ductility Capacity of the Two Existing Joglo Timber Buildings

This study aimed to develop a ۳D model of existing timber buildings to obtain the capacity curve and ductility capacity of structural systems under lateral loads. The research scope involved a case study of two existing Joglo timber buildings. Nonlinear modeling of beams and columns was performed using hinge property data for each member. Joint modeling employed spring elements to account for the effect of rotational stiffness. The evaluations included the capacity curve, ductility capacity, plastic hinge mechanisms, and energy dissipation. Results from the pushover analysis produced a capacity curve used to investigate ductility capacity and energy dissipation. Structural performance in both the x- and y-directions exhibited similar behavior, characterized as partially ductile. The existing timber buildings demonstrated ductility capacities ranging from ۲.۳۶ to ۳.۲۸, placing them in the partial ductility category. These results meet the building criteria for earthquake zones with a peak ground acceleration (PGA) exceeding ۰.۱۰g. The plastic hinge mechanism satisfied the strong column–weak beam criterion. The peak displacements at the Collapse Prevention level were ۱۳۷.۳۶ mm (Joglo-M) and ۱۳۹.۰۳ mm (Joglo-N). These values indicate that the post-elastic behavior of the structures exceeds the permitted limits, suggesting good energy dissipation capacity before final failure. Notably, these two buildings have a history of withstanding several earthquakes over the past twenty years without sustaining damage.

کلیدواژه ها:

Ductility capacity ، Capacity curve ، Joglo ، Timber building ، Earthquake