高强钢筋混凝土异形柱抗震性能试验研究

EXPERIMENTAL RESEARCH ON SEISMIC BEHAVIOR OF HIGH STRENGTH REINFORCEMENT CONCRETE SPECIALLY SHAPED COLUMNS

为了研究配箍率对T形柱和L形柱的破坏特征、滞回特性、刚度退化、延性性能、耗能能力的影响规律,采用拟静力试验方法,对4个高强钢筋的混凝土T形柱和L形柱进行低周往复荷载作用下的试验,分析构件的破坏特征、延性性能,绘制滞回曲线、刚度退化曲线以及等效黏滞阻尼比曲线。研究表明:高强钢筋和高强混凝土T形柱和L形柱的滞回曲线下降段较陡且延性较差;增加配箍率可以改善T形柱和L形柱试件的破坏特征和试件的滞回特性,增加T形柱和L形柱试件的耗能能力。

For the effect of stirrup ratios on damage characteristic, hysteretie characteristic, rigidity degradation, ductility performance, energy dissipation capacity of T-shaped and L-shaped columns, through quasi-static test method , four concrete specially shaped columns, high strength steel bars were tested under low cyclic loading. The component failure characteristics and ductility performance were analyzed, hysteresis curves and stiffness degradation curves and equivalent viscous damping coefficient curves were also plotted. The results show that descending parts of the hysteresis loops of specially shaped columns, high strength steel bars and concrete are steeper and the ductility was also worse. The damage characteristic and the hysteretie characteristic of specimens were improved with the increase of stirrup ratios. The energy dissipation capacity of T-shaped column and l,-shaped column were also enhanced with the increase of stirrup ratios.