Reliability Analysis of Reinforced Concrete Columns after High Temperature under Comprehensive Considering Failure Paths

Reliability of reinforced concrete (RC) eccentric compression columns is influenced by many factors. Resistance model and limit state equations of RC eccentric compression columns are established through introducing strength reduction factors of reinforcement and concrete. A Monte Carlo method is utilized to simulate for assessing the reliability of RC eccentric compression columns after high temperature under comprehensive considering failure paths. A sample to determine fire and columns temperatures and the capacity of RC columns is adopted for this analysis to structure the methodology. Analysis results indicates that the reliability assessment method is fully different under the eccentricity is relatively large or small, and the reliability assessment is not safe under considering single failure path, so comprehensive considering failure paths is more matching the true situation than only considering single factor (axis or moment) when evaluate reliability of RC eccentric compression columns post-fire. In addition, the effects of some parameters on reliability index are analyzed, which supply theory basis on safe assessment, maintenance and strengthening of RC member post-fire.