Study On Shear Behavior Of The Reinforced Concrete Beam Which Is Strengthened By The High Performacne Ferrocement Laminate After The Fire

High Performance Ferrocement Laminate (HPFL) is a new reinforcement methodwith good durability, corrosion resistance and high temperature resistance. Thismethod has a smaller effect on clearance and the back-up coat can work together withconcrete effectively. Combined with an engineering example and experiment data,design formula of the reinforced beam’s shear capacity with HPFL after fire anddeflection considering the influences of shear deformation was deduced and verified.The main contents and are as follows:1. Summarized the domestic and foreign scholars’ research on concrete’s andsteel’s mechanical properties after fire (high temperature) and thermal performance,put forward a simplified calculation model.2. Design formula of the reinforced beam’s shear capacity with HPFL after firewas deduced by a truss-arch model. The design formula was verified by theexperimental data.3. Based on the equivalent bending moment method and the knowledge ofstructural mechanics, formula of the strengthened beam’s flexural stiffness, shearstiffness and deflection was deduced and verified by experimental data.4. Regardless of the change of the temperature field along the length direction ofthe beam, this thesis did a finite element simulation on the two dimensionaltemperature of reinforced concrete beam. Got the temperature field of the crosssection of the beam in the900s,1800s,3600s,5400s,7200s. Got the temperature-timecurve of six temperature output points on the cross section of the beam. Got thetemperature-height curve on the center line of the cross section of the beam in the900s,1800s,3600s,5400s,7200s.5. This thesis did finite element simulations respectively on beam L1whichreinforced with three side and beam L2which reinforced with four side about their shearcapacity with HPFL after fire and deflection of the cantilever end, and calculated theeffective contribution of the steel fabric on the shear capacity. The simulated results andwere in good agreement with the theoretical formula.