Thermal-Elastic-Plastic Finite Element Analysis for Fire Behaviors of Unbonded Prestressed Concrete Slabs
Gao Litang(1,2),Chen Ligang(1),Li Xiaodong(1),Dong Yuli(1)
(1 Dalian University of Technology, 116024, Dalian, China) (2 Qingdao Technological University, 266033, Qingdao, China)

Abstract: The experiment reveals that reinforced flexural concrete members in fire undergo large deformations with large rotations, especially in slabs exposed to fire on one face, which can be considered as a geometrically and constitutively non-linear problem. Update co-moving coordinate finite element based S-R decomposition theorem is chosen to solve the thermal strains, creep strains and plastic strains of tendons due to the varying temperature along the stressed tendons. The finite element program is developed for unbonded prestressed concrete slabs to show the efficiency.
Keywords: fire, S-R decomposition theorem, large deformation, coª²moving coordinate, thermalª²elasticª²plastic, finite element.