Pattamad Panedpojaman. Moment capacity prediction for fire-damaged RC beams using simplified method. (). King Mongkut's University of Technology North Bangkok. Central Library. : , 2018.
Moment capacity prediction for fire-damaged RC beams using simplified method
Abstract:
A simplified method to assess residual capacity of fire damaged RC beams under various fire loads is proposed based on force equilibrium and strain distribution. In a similar manner to 500°C isotherm method, concrete section is separated into two parts, i.e., effective part and ineffective part using suitable critical temperature. In the current study, Concrete segment which experience temperature higher than 650°C is considered as ineffective part, whereas the remainder is considered as effective part. Compressive strength of concrete is halved for concrete within effective section, and neglected for concrete within ineffective section. In addition, tensile strength of steel rebars are also reduced depend on their observed maximum temperature. The distribution of temperature within fire-exposed RC beam section is predicted by using energy based method. The accuracy of proposed simplified technique is verified by comparing with validated finite element model. It is found that moment capacity predicted by simplified technique provide slightly conservative solution when compare to finite element model.
King Mongkut's University of Technology North Bangkok. Central Library