侧向循环荷载下钢管混凝土柱的性能

给出准静态荷载作用下钢管混凝土柱累积损伤性能研究的试验结果。研究参数有:钢管的径厚比、2种类型的填充物(素混凝土和钢纤维混凝土)。试验第1阶段采用一系列基准试验来确定变幅循环荷载作用下钢管柱的滞后性能,试验第2阶段主要研究恒幅循环荷载作用下荷载大小和循环次数对钢管柱累积损伤的影响,并对试验结果进行了总结。研究表明,钢纤维混凝土填充的钢管混凝土柱与素混凝土填充的钢管混凝土柱相比,其延性和能量吸收能力显著增加,损伤指数降低。给出预测填充柱累积损伤指数的简单公式,该指数可以对新的和已有的填充柱进行地震安全评估。

Behaviour of Concrete-Filled Steel Columns Subjected to Lateral Cyclic Loading

This paper reports the findings of an experimental study that was undertaken to investigate the cumulative damage of in-filled steel columns subjected to quasi-static loading. The parameters studied are, the diameter-to-thickness ratio of the steel tube and two types of in-fills namely Plain cement concrete and Steel fiber reinforced concrete. This paper summarizes the results of phase I testing that consisted of benchmark tests to establish the hysteresis behaviour under variable amplitude cyclic loading and phase II testing that consisted of constant amplitude cyclic loading that focused on the effects of amplitude and number of cycles on damage accumulation of in-filled columns. Findings of these studies highlight the significant increase in ductility and energy absorption capacity and decrease in the damage index of Steel fiber reinforced concrete-filled steel columns compared to plain cement concrete-filled columns. A simplified equation for cumulative damage has been proposed to predict the damage index of in-filled columns. This index can be used as a measure for predicting the safety of new and existing in-filled columns against earthquake.