节能型高恢复性钢筋混凝土柱的抗震性能与评估方法

Seismic behavior and evaluation of sustainable and resilient concrete columns

通过对6根不同剪跨比和不同钢筋屈服应力的钢筋混凝土柱进行一定轴压下的水平反复加载试验,研究采用大量粉煤灰制成的混凝土柱的抗震性能,分析钢筋表面形状和屈服应力对柱子抗震性能的影响程度,提出可考虑钢筋滑动效应的滞回曲线分析方法。试验结果表明,采用粉煤灰和超高强螺纹钢筋能够保证柱子在较高轴压下具有非常稳定的抗震响应,并能够极大减小柱子的残留变形,是实现节能型高恢复性钢筋混凝土结构的简单有效方法。与试验结果的对比表明,所提出的分析方法可精确评估高恢复性混凝土柱的滞回性能。

Six concrete columns were fabricated and tested under reversed cyclic lateral loading while subjected to constant compression to investigate seismic performance of concrete columns made of a large amount of fly-ash and ultra- high-strength rebar with spiral groove in its surface. The test results have clearly indicated that utilization of fly-ash and ultra-high-strength rebar with low bond stress can assure very stable seismic response and significantly reduce residual deformation of the columns even they are under high axial compression, and hence is a simple and effective method to make sustainable and resilient concrete members. Comparison between the analytical predictions and the experimental hysteretic curves has verified validity and accuracy of the analytical method presented in this paper for evaluating cyclic behavior of concrete members made of rebar with low bond strength.