钢绞线预应力的改变对自复位钢框架性能影响

Influence of prestress change in stand on seismic behavior of self-centering frame

通过ANSYS模拟和试验结果对比,说明了模拟方法的正确性。在此基础上,通过改变自复位钢框架钢绞线上施加预应力大小,建立了四个单层单跨自复位钢框架结构模型。对比分析了钢框架上角钢Mises应力云图、力-位移滞回曲线、结构骨架曲线以及刚度退化曲线。研究表明,随着钢绞线预应力的增加,钢框架刚度增大,屈服荷载与极限荷载增加,自复位钢框架耗能能力稍微降低,自复位能力明显增强。

The correctness of the modeling method was illustrated by comparing the ANSYS simulation with the test result. Based on the illustration, four single-layer self-centering frames were set up by changing the prestress in stand of the self-centering frame structure. On the basis of the finite element simulation, the Mises stress cloud on angle, force-displacement hysteresis curves, skeleton curves, and the stiffness degradation in the steel frame were analyzed. The research shows that along with the increase of the prestress in strand, the stiffness of self-centering frame increases, the yield load and ultimate load increase, and the capability of self-centering frame increases, but the energy dissipation of the self-centering frame structure slightly decreases.