The Dynamic Loading Test Of Reinforced Concrete Shear Walls And Its Finite Element Analysis Considering Strain Rate Effects

As a typical member in the tall buildings, the reinforced concrete shear walls have a relatively large lateral stiffness, which can reduce the lateral displacement obviously. At the same time, it can dissipate the energy through plastic deformation under strong winds and earthquakes. This function makes it become an important member in the high-rise buildings. Thus, theoretical research and experimental research of reinforced concrete shear walls'dynamic nonlinear behavior become more and more important. In this paper, the rapid loading tests of two reinforced concrete shear walls were conducted to study the effect of loading rate on the load-carrying capacity and hysteretic properties. Meanwhile, the concrete damaged plasticity model based on finite element software ABAQUS is used to establish a finite element model of the reinforced concrete shear wall, which considered the strain rate effect. Through using the finite element model, the nonlinear behavior of reinforced concrete shear walls under different loading rates was simulated.The paper mainly includes the following work:(1) Two reinforced concrete shear wall specimens were designed, which were tested under different loading rates. Through this experiment, the force-displacement hysteresis curves and skeleton curves were obtained. Based on the test results, the analysis of anti-seismic performance of specimens was carried out including ductility, load-carrying capacity, the degradation of strength and stiffness, and the dissipation of energy;(2) Through using the smart aggregate which is based on PZT in the experiments, the health monitoring of specimens under rapid loads was realized. Based on the wavelet-packet analysis of PZT sensors'measurement signal, the damage index of concrete is defined, and the damage of reinforced shear wall under different loading levels was monitored, which was compared with the observed result. The comparing result proves that the monitoring technology based on PZT is effective.(3) Based on the concrete damaged plasticity model in ABAQUS, the finite element model of reinforced shear wall considering strain rate effect was established. Then the model was used for finite element analysis of the tested specimens. According to the finite element simulation, the force-displacement curves of the walls were obtained, which were used to compare with the tested results. Through comparing the results, it proves that the finite element model established in this paper is effective;(4) Through using the finite element model established in this paper, the parameters analysis of reinforced concrete shear walls were performed including the effect of axial compression ratio, reinforcement ratio and high aspect ratio to the mechanical property of reinforced concrete shear walls; Through the parameter analysis, the corresponding force-displacement curves were obtained. The finite element analysis results were compared with the test results when the parameter "axial compression ration" was analyzed. The comparison results showed the effectivity of the finite element model established in this paper again.