不同硅粉掺量下RAC柱抗震性能试验与分析

Test and analysis on seismic performance of RAC columns under different silica content

为了研究硅粉增强RAC柱的抗震性能,选取1根普通RAC柱作为对照组,3根分别掺杂4%、6%和8%硅粉的RAC柱作为试验组,结合ABAQUS有限元模拟,对RAC柱的破环模式、骨架曲线、承载力、延性破坏、耗能能力和刚度退化等性能进行了分析。结果表明:有限元模拟结果与试验结果符合较好,其破坏形式都是从柱脚开始产生裂缝,并逐步向上扩展,最后直至柱脚混凝土开始出现破坏、脱落;在掺杂硅粉含量为6%的情况下,有利于提高RAC柱的抗震性能,但是随硅粉含量的增加,柱的延性降低,耗能能力减弱,刚度和承载力退化速度快。

In order to study the seismic performance of RAC column silica fume enhanced, this paper selected one common RAC column as the control group,and the three column containing 4% ,6% and 8% silica fume as the experimental group,combined with ABAQUS finite element simulation, the broken ring model, skeleton curve, bearing capacity, ductility, energy dissipation and damage stiffness degradation properties of RAC column were analyzed. The results showed that the finite element simulation results coincided well with the test results,the destroy of RAC column were first in the column foot began to produce cracks, and gradually expanded upward, finally,the concrete column feet began to appear destruction and abscission. In the doped silica fume content of 6% cases,the seismic performance of RAC column had been improved. The ductility of the column or the energy dissipation capacity decreased, and the stiffness and bearing capacity were degraded rapidly.