Research On Post-fire Performance Of Transfer Joints In Reinforced Concrete Structure With Bearing Column Girder Transfer Floor

With the development of multi-functional buildings,the application of reinforced concrete structure with transfer floor is wider and wider.Transfer floor plays a key role.In this kind of buildings,and the safety of the whole structure is threatened if the floor is destroyed.So the research on post-fire performance of the bearing behavior and deterioration law has great theoretic and realistic significance.Aiming at the transfer joints in the reinforced concrete structure with bearing column girder transfer floor,we carry out post-fire performance experiments which the joins were in different fire cases and different heating up time..The main research contents and results are as follows:(1)The heating-up experiment of the 8 bearing column girder transfer floor was measured according to the standard heating-up curve of ISO-834,and the heating-up experiment was carried out under different fire conditions.After 90 min and 120 min respectively,the temperature was gradually cooled to room temperature.And the distribution of the temperature field of the specimen during the whole process of temperature rise and fall,the distortion of the specimen and the image of the transition joist during the heating process are in measurement and analysis.(2)The static load experiment was carried out on 8 specimen structures of the transition structure after the fire and two specimens at the conversion joints at room temperature.Analyse in contrast the crack propagation law,deformation characteristics and damage characteristics of the reinforced concrete with bearing column girder transfer floor under the load after the fire.(3)Based on finite element software ABAQUS,the joint model of reinforced concrete with bearing column girder transfer floor is established.Based on the temperature field analysis of the temperature rise process,the whole process simulation of the nodal specimenafter the fire is carried out.The simulation results are compared with the experimental results,which are in good agreement with each other.