含水率和腐蚀因素对钢筋混凝土柱抗震性能的影响

Influence of water content and corrosion factors on seismic behavior of RC columns

通过分析混凝土试块浸泡在水中和不同浓度腐蚀溶液中力学性能变化的试验结果,回归出混凝土抗压强度和弹性模量随含水率或腐蚀时间变化的计算模型,并通过纤维模型有限元程序OpenSees,对不同含水率或不同腐蚀程度的钢筋混凝土模型柱在低周往复荷载作用下的受力性能进行了模拟.结果表明:随着含水率的增加,两种养护条件下,构件抗震性能降低的程度较小,但随着腐蚀程度的增大,构件耗能能力和延性的降低及承载力和刚度的衰减比较显著.

Through the analysis of mechanical properties of concrete being soaked in water and different corrosion solution,this paper established the regression model of compressive strength and elastic modulus variation with water content or corrosion period,and analyzed the seismic performance of RC columns with different water content or corrosion degree under low cycle reversed loads based on the fiber model of OpenSees software.The results show that,with the increase of water content,the seismic performance of concrete under two curing conditions have no significant reduction,but with the increase of corrosion,the reduction of energy dissipation capacity and ductility,the attenuation of bearing capacity and stiffness are obvious.