精轧螺纹钢混凝土柱抗震性能理论与数值模拟

为了提出一种混凝土柱的抗震性能计算方法并研究精轧螺纹钢 (PSB) 混凝土柱的抗震性能，基于截面分割法理论，采用MATLAB软件开发了PSB筋材混凝土柱抗震性能计算程序。之后对9个PSB筋材混凝土方柱进行了低周反复荷载作用下的数值模拟。研究PSB筋材混凝土柱抗震性能随着PSB筋材配筋率、混凝土强度和轴压比改变时的变化规律。结果表明:提高PSB配筋率或混凝土强度时，承载力和耗能能力会随之提高；模型S1-1.29相较于S1-0.64承载力提高了37.6%，在5.0%位移角下的累积耗能提高了45.7%；模型S2-60相较于S2-40承载力提高了18.2%，在5.0%位移角下的累积耗能提高了13.8%；增大轴压比时，耗能能力提高，峰值荷载变化不大，峰值荷载对应的位移角减小；轴压比较大时，模型在达到峰值荷载后的水平承载力退化速度加快。

Theoretical and Numerical Simulation of Seismic Behavior of Concrete Columns reinforced with Prestressing-Screw Bars

In order to propose a calculation method for the seismic performance of concrete columns and investigate the seismic performance of the columns reinforced with Prestressing-Screw Bars(PSB), a calculation program for the seismic performance of concrete columns reinforced with PSB was developed by using MATLAB software based on the theory of section division method. Then the numerical simulation was carried out on 9 square concrete columns reinforced with PSB under combined low cyclic reversed lateral load. The variation law of the seismic performance of concrete columns reinforced with PSB with the variation of the ratio of PSB reinforcement, concrete strength and axial compression ratio were studied. The results show that: When the PSB reinforcement ratio or concrete strength increased, the lateral peak load of the columns and energy dissipation capacity increased accordingly; for example, the lateral peak load of model S1-1.29 was 37.6% higher than that of S1-0.64, and the cumulative energy consumption increased 45.7% at the displacement drift of 5.0%, the lateral peak load of model S2-60 was 18.2% higher than that of S1-0.64, and the cumulative energy consumption increased 13.8% at displacement drift of 5.0%; when the axial compression ratio increased, the energy dissipation capacity increased accordingly, the change of the lateral peak load was little, and the displacement drift corresponding to the largest peak load decreased; when the axial pressure ratio was large, the degradation speed of the horizontal bearing capacity of the model after reaching the peak load was accelerated.