足尺钢筋混凝土柱倒塌试验研究

Collapse test study of full-scale RC column

钢筋混凝土柱是框架结构中抗地震倒塌的关键构件,目前众多学者以水平承载力降至85%作为构件的失效判据,缺少RC足尺柱在大变形下的受力性能分析。本文通过1个足尺现浇钢筋混凝土柱进行拟静力倒塌试验,研究试件在大变形下的滞回性能、骨架曲线及耗能能力。试验结果表明:加载点水平力-位移滞回曲线比较饱满,构件具有良好的耗能能力,极限位移角达到1/15,并且证实了以往传统水平承载力降至极限承载力85%就结束试验的标准在某些情况下偏保守,并不能反映真实的极限失稳状态,并对结构倒塌数值分析给出了位移角限值建议。

Reinforced concrete column is a key member of building structure to resist earthquake collapse.At present,many scholars take the reduction of horizontal bearing capacity to 85%as the failure criterion of the member,lacking the force performance analysis of RC full-scale column under large deformation.In this paper,a full-scale cast-in-place reinforced concrete column is subjected to the proposed static collapse test to study the hysteresis performance,skeleton curve and energy dissipation capacity of the specimen under large deformation.The test results show that:the horizontal force-displacement hysteresis curve at the loading point is relatively full,indicating that the member has good energy dissipation capacity,and the ultimate displacement angle reaches 1/15,and confirms that the previous standard of ending the test when the traditional horizontal bearing capacity is reduced to 85%of the ultimate bearing capacity is too conservative and does not reflect the real ultimate instability state,and gives the suggestion of displacement angle limit value for the numerical analysis of structural collapse.