Quasi-Static Numerical Simulations and Resilient Force Models of GFRP-Confined FRP Bar-Reinforced Concrete Piers
To study the seismic performances of a novel of GFRP-confined FRP bar-reinforced concrete piers,also called FCFRC piers which were constructed of GFRP rebars,CFRP stirrups,GFRP sheets,and concrete,a numerical simulation model for FCFRC piers under the monotonic and cyclic horizontal loads was developed based on software OpenSee.By the model,taking axial compressive ratios,shear-span ratios,lon-gitudinal reinforcement ratios,confining levels of CFRP stirrups and external wrapped sheets,strength de-grees of concrete and sizes of cross sections of piers as variables,pushover analysis was conducted on 5 184 FCFRC pier specimens.The effect of the above variables on key parameters of the trilinear resilience model with the yield bearing capacity,the peak bearing capacity,the elastic and elastic-plastic stiffness,and the ultimate drift angle was obtained.Analysis results indicated that the yield and ultimate bearing capacities all could be improved by increasing axial compressive ratios,longitudinal reinforcement ratios,strength degrees of concrete and sizes of cross sections,however,the confining levels of CFRP stirrups and external wrapped sheets had a little effect on them relatively.Based on the results of parameter analysis,the formulas for key parameters of the resilient model were obtained.In addition,the loading-unloading hysteresis regulation be-tween horizontal force and displacement of FCFRC piers was proposed.Combining the skeleton curve and the hysteresis regulation,a resilient model for horizontal force and displacement of FCFRC piers was presented,simultaneously,compared with the test results,the adaptability of the model was verified.
FRP-confined concreteFRP bar-reinforced concrete pierquasi-static simulationresilient force model
万方数据
维普
