(二)露出型钢柱脚的滞回性能 1.M-(?)滞回曲线在钢柱脚的12组M-(?)滞回曲线中选取一部分曲线示于图6,其中M和(?)为柱脚底板与混凝土基础接触面的弯矩和相应转角。12组曲线的特点是:呈滑移型;锚栓屈服前M与(?)间基本为弹性关系,锚栓屈服后基本为塑性关系;各滞回曲线竖轴高度基本上成一条水平线。 (ii) Hysteresis behavior of exposed steel legs 1. M-(?) Hysteresis curve One of the 12 M-(?) hysteresis curves of the steel column foot is shown in Fig. 6, where M and (? ) It is the bending moment and the corresponding corner of the contact surface between the base plate and the concrete foundation. The characteristics of the 12 sets of curves are: slip type; the elastic relationship between M and (?) before anchor bolt yielding is basically plastic relationship after anchor bolt yield; the vertical axis height of each hysteresis curve is basically a horizontal line.