HINGE PROPERTIES MODELING for BEHAVIOR and PERFORMANCE EVALUATION of RC-SHEARWALL BUILDINGS
One of the performance-based design methods, named pushover analysis, recently attracting practicing structural engineers engaged in the field of seismic design. The objective of a performance-based design is achieved after the user and the designer collectively select a target performance for the structure in question. The engineer carries out the conventional design and subsequently performs a elasto-plastic analysis to evaluate if the selected performance objective has been met. Structural walls are commonly used to resist lateral forces in reinforced concrete buildings. Hinge properties of wall elements are modeled by a vertical line element located in the middle connecting the top and bottom rigid beams constitute a wall element. The middle line element identically behaves like a 3D beam-column element. The top and bottom rigid beams act as rigid bodies in the x-y plane. The moments about the z-axis represent the in-plane bending behavior. The out of plane bending behavior is not considered in the wall element. In this study, sixteen story of 3D regular buildings with dual systems special moment resisting frame, located in zone 6 Indonesian Seismic Zone, stiff soil, are designed in accordance with the Indonesian Earthquake Code and the Indonesian Reinforced Concrete Building Code. The seismic behavior and performance of these buildings are evaluated with static nonlinear pushover analysis using MIDAS/GenTM software. Modeling of hinge properties using two approach, that are multi-linear type and FEMA type. Modeling of lateral load for pushover analysis using two approach, that are uniform acceleration and mode-1 model. Results in this study showing that the seismic behavior of buildings are good. All buildings are included in immediate occupancy performance, which mean limited damage, no permanent drift, substantially original strength and stiffness, minor cracking, elevators can be restarted, and fire protection operable. Results in this study indicate % relative base shear at performance point of multi-linear and FEMA type of hinges are 15%-20%, otherwise % relative displacement at performance point between two approach of hinges are below 1%.