Structural Engineering and Mechanics

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Performance assessment of RC frame designed using force, displacement & energy based approach

  • Kumbhara, Onkar G. (Department of Applied Mechanics, Visvesvaraya National Institute of Technology) ;
  • Kumar, Ratnesh (Department of Applied Mechanics, Visvesvaraya National Institute of Technology)
  • Received : 2019.07.07
  • Accepted : 2019.11.12
  • Published : 2020.03.25
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Abstract

Force based design (FBD) approach is prevalent in most of the national seismic design codes world over. Direct displacement based design (DDBD) and energy based design (EBD) approaches are relatively new methods of seismic design which claims to be more rational and predictive than the FBD. These three design approaches are conceptually distinct and imparts different strength, stiffness and ductility property to structural members for same plan configuration. In present study behavioural assessment of frame of six storey RC building designed using FBD, DDBD and EBD approaches has been performed. Lateral storey forces distribution, reinforcement design and results of nonlinear performance using static and dynamic methods have been compared. For the three approaches, considerable difference in lateral storey forces distribution and reinforcement design has been observed. Nonlinear pushover analysis and time history analysis results show that in FBD frame plastic deformation is concentrated in the lower storey, in EBD frame large plastic deformation is concentrated in the middle storeys though the inelastic hinges are well distributed over the height and, in DDBD frame plastic deformation is approximately uniform over the height. Overall the six storey frame designed using DDBD approach seems to be more rational than the other two methods.

Keywords

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