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Structural Engineering and Mechanics
  Volume 60, Number 6, December25 2016, pages 1021-1038
DOI: http://dx.doi.org/10.12989/sem.2016.60.6.1021
 


Investigation of shear effects on the capacity and demand estimation of RC buildings
Mehmet Palanci, Ali Kalkan and Sevket Murat Senel

 
Abstract
    Considerable part of reinforced concrete building has suffered from destructive earthquakes in Turkey. This situation makes necessary to determine nonlinear behavior and seismic performance of existing RC buildings. Inelastic response of buildings to static and dynamic actions should be determined by considering both flexural plastic hinges and brittle shear hinges. However, shear capacities of members are generally neglected due to time saving issues and convergence problems and only flexural response of buildings are considered in performance assessment studies. On the other hand, recent earthquakes showed that the performance of older buildings is mostly controlled by shear capacities of members rather than flexure. Demand estimation is as important as capacity estimation for the reliable performance prediction in existing RC buildings. Demand estimation methods based on strength reduction factor (R), ductility (u), and period (T) parameters (R-u-T) and damping dependent demand formulations are widely discussed and studied by various researchers. Adopted form of R-u-T based demand estimation method presented in Eurocode 8 and Turkish Earthquake Code-2007 and damping based Capacity Spectrum Method presented in ATC-40 document are the typical examples of these two different approaches. In this study, eight different existing RC buildings, constructed before and after Turkish Earthquake Code-1998, are selected. Capacity curves of selected buildings are obtained with and without considering the brittle shear capacities of members. Seismic drift demands occurred in buildings are determined by using both R-u-T and damping based estimation methods. Results have shown that not only capacity estimation methods but also demand estimation approaches affect the performance of buildings notably. It is concluded that including or excluding the shear capacity of members in nonlinear modeling of existing buildings significantly affects the strength and deformation capacities and hence the performance of buildings.
 
Key Words
    pushover analysis; reinforced concrete buildings; seismic demand; capacity spectrum method
 
Address
Mehmet Palanci: Department of Civil Engineering, Istanbul Arel University, Istanbul, 34537, Turkey
Ali Kalkan and Sevket Murat Senel: Department of Civil Engineering, Pamukkale University, Denizli, 20000, Turkey
 

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