圆钢管再生混合混凝土框架性能的控制分析

为了从结构层面分析柱截面含钢率和废弃混凝土取代率对再生混合混凝土组合结构抗震性能的控制作用,通过对四榀圆钢管再生混合混凝土框架进行定常轴力和水平往复荷载作用下的拟静力试验,研究各柱截面含钢率和柱内废弃混凝土取代率对试件的滞回特性、骨架曲线、延性、刚度退化和耗能能力等抗震性能指标的控制效果。结果表明,四榀框架破坏现象均为梁铰破坏机制;随着柱截面含钢率的提高,试件的水平承载力、塑性变形能力和位移延性显著提高,刚度退化速率降低;而废弃混凝土取代率对试件各项指标的影响规律与含钢率恰好相反,且影响程度有限;柱截面含钢率与废弃混凝土取代率共同作用,使二者对结构水平承载力和结构耗能能力有所不同。

Analysis on Controlling of the Performance of Circular Steel Tubular Recycled Mixed Concrete Frame

In order to analyze the control effects of replacement rate of the demolished concrete and steel rate on seismic behavior of demolished concrete composite structures from the structure level, pseudo-static test of frames, which comprise four circular steel tubular columns filled with recycled mixed concrete, subjected to axial load and cyclical horizontal load was conducted. The effects of these two parameters on the seismic behavior indexes including hysteretic performance, skeleton curve, ductility, stiffness degeneration and dissipation were studied. The results show that all the failure modes of four circular steel tubular frames were the breaks of the beam hinge. With the steel column section rate increasing from 3.8% to 7.7%, the horizontal bearing capacity, the plastic deformation capacity and the ductility coefficient of the specimens rise significantly, and the degeneration rate of stiffness reduces. However, the influence rule of the recycled concrete rate on the targets is contrary to that of steel rate and the influence degree is limited. The synergetic action of the demolished concrete rate and the steel rate leads to various horizontal bearing capacities and energy-dissipating capacities of the structures.