Investigation the behavior and ductility of low rise RC tunnel –form systems

The tunnel form buildings provide some advantages for medium to high-rise buildings that constructed by using a special tunnel form technique are commonly built in countries facing a substantial seismic risk. There are no special requirements for seismic design of this type of buildings, and some provisions of the concrete bearing wall system are used. None of the seismic codes addresses the R factor for tunnel‐form buildings directly. This study presents R factor of this structural system based on the nonlinear pushover analyses of 7 case studies using the ABAQUS software. The impacts of shear wall reinforcement ratio and its detailing on system ductility, load-carrying capacity and failure mechanism under seismic forces are evaluated. Influences aspect ratio and wall openings on the response are also discussed.