摘要
地震过程中，框架柱往往会有较大的水平位移，震后同样会存在较大的残余变形，所以如何控制结构的残余变形，提高其抗震性能是一个值得深入研究的课题。本文对5根无粘结部分预应力混凝土框架柱进行拟静力试验研究，通过试验，对滞回曲线、延性、耗能能力、刚度退化以及其复位能力等进行研究，以全面了解无粘结部分预应力混凝土框架柱的抗震性能。研究结果表明：在钢筋混凝土框架柱中配置无粘结预应力钢绞线并不利于其耗能能力的提高；随着预应力度的提高，试验柱的刚度和极限承载力逐渐降低，而延性和复位能力均有一定程度的增强；随着预加轴压比的提高，试验柱的刚度、复位能力和极限承载力降低，但是延性增强。
It is a further research topic to control the residual deformation and improve the seismic behavior of the column, due to that the column always appears large horizontal displacement in process of earthquake and residual deformation after seismic. The paper produced five unbounded partially prestressed concrete frame columns, pseudo-static tests are conducted, covering some important factors,for example, hysteretic curve, ductility, energy dissipation capacity, stiffness and strength degradation as well as its re-centering capacity.The results show that the reinforced concrete frame column with unbounded prestressed steel strand is not conducive to the improvement of the energy dissipation capacity. Enhancing the prestress degree, the column＇ stiffness and ultimate bearing capacity is degradated, while the ductility asnd re-centering capacity is improved. The improvement of preaxial compression ratio, decreases the stiffness of columns, recentering capacity and ultimate bearing capacity, but the ductility is increased.
关键词
预应力度
预加轴压比
抗震性能
Prestress degree Pre-axial compression ratio Reismic behavior
