Seismic performance assessment of wide beam infill joist block frame structures in Turkey

Karaaslan, Enes
Wide-beam frame buildings are prevalent in Turkey since 1980’s due to their advantageous characteristics such as ease of construction, construction speed and cost efficiency. However; according to recent experimental studies, wide beam systems demonstrate poor energy dissipation capacity under earthquake. The capacities of the wide-beams may not fully developed at the beam-column joints. The beam reinforcements that do not anchor to the core area of the columns may not reach their full capacities unless special measures are taken. The goal of this thesis is to simulate the behavior of wide beam buildings under earthquake excitation through the earthquake simulation software OpenSees (Open System for Earthquake Simulation). The software occupies Modified Ibarra-Krawinkler Deterioration Model in order to model the hysteresis behavior of interior and exterior wide-beam connections. The hysteresis cycles of several experimental studies are calibrated through a procedure developed based on Haselton’s calibration equations. Later this calibration is implemented to the simulation of a wide-beam building model and a vulnerability study is carried out. The deformation limits of Immediate Occupancy (IO), Life Safety (LS) and Collapse Prevention (CP) are first identified through a pushover analysis. Later, a set of earthquake data is used in consecutive time history analyses and the maximum inter-story drift ratios are recorded for each ground-motion input. Finally, a set of fragility curves are produced for different types of ground motion parameters. The results are compared with the results of typical conventional moment frames and flat slab buildings.
Citation Formats
E. Karaaslan, “Seismic performance assessment of wide beam infill joist block frame structures in Turkey,” M.S. - Master of Science, Middle East Technical University, 2015.