Seismic ground motions produce strains which are represented by lateral forces for design of earthquake-resistant structures. Reinforced Concrete (RC) walls in buildings are designed to resist these lateral forces. IS 13920: 2016 recommends boundary elements with dimension greater than the thickness of the wall to be provided at the ends of RC structural walls. This results in barbell-shaped wall sections. The prevalent method of design assumes boundary element to act as short axial column carrying axial load arising from gravity loads, and a force-couple idealised from the bending moment beyond the capacity of the wall web. The presented study aims to design a monolithic barbell-shaped wall section for axial force and bending as per the limit state design method stated in IS 456: 2000. The expressions for moment of resistance proposed in this article presume a linear strain distribution profile for different conditions resulting in collapse of the walls. The wall sections with boundary elements are observed to have higher flexural capacity at the same axial load as per the suggested design method, compared to the design as per the present IS 13920: 2016, i.e., “Indian Code of Practice for Ductile Design and Detailing of Reinforced Concrete Structures Subjected to Seismic Forces”.

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Monolithic Design of Walls with Boundary Elements for Axial Force and Bending

  • Rahul Gupta,
  • Mahesh Chandra,
  • Rakesh Kumar Khare

摘要

Seismic ground motions produce strains which are represented by lateral forces for design of earthquake-resistant structures. Reinforced Concrete (RC) walls in buildings are designed to resist these lateral forces. IS 13920: 2016 recommends boundary elements with dimension greater than the thickness of the wall to be provided at the ends of RC structural walls. This results in barbell-shaped wall sections. The prevalent method of design assumes boundary element to act as short axial column carrying axial load arising from gravity loads, and a force-couple idealised from the bending moment beyond the capacity of the wall web. The presented study aims to design a monolithic barbell-shaped wall section for axial force and bending as per the limit state design method stated in IS 456: 2000. The expressions for moment of resistance proposed in this article presume a linear strain distribution profile for different conditions resulting in collapse of the walls. The wall sections with boundary elements are observed to have higher flexural capacity at the same axial load as per the suggested design method, compared to the design as per the present IS 13920: 2016, i.e., “Indian Code of Practice for Ductile Design and Detailing of Reinforced Concrete Structures Subjected to Seismic Forces”.