中性盐雾腐蚀钢板的滞回性能试验  

Experimental study on hysteretic behavior of corrosion steel in the neutral salt spray

作　　者：徐善华[1] 秦广冲 张宗星[1] 王友德[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《哈尔滨工业大学学报》2016年第11期183-188,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51378417);教育部长江学者和创新团队发展计划项目(IRT13089)

摘　　要：为研究中性盐雾环境下不同腐蚀程度钢板的滞回性能变化规律,通过人工喷洒盐雾加速腐蚀方法,获得了不同腐蚀程度下钢板试件;然后对每组试件进行循环加载试验并得到滞回曲线,分析其滞回性能;同时采用Ramberg-Osgood模型拟合钢材的循环骨架曲线,并分析其系数变化规律;最后基于首次加载准则,卸载准则,循环骨架准则,再加载曲线准则等建立了钢材滞回本构模型.试验结果表明:在循环荷载作用下,钢材出现循环硬化、峰值点指向效应等现象;应用Ramberg-Osgood模型拟合效果较好;随着腐蚀程度增加,钢材各力学性能指标均出现下降,延性劣化加重,且钢材循环强化系数呈现减小的趋势,而循环强化指数变化规律不明显;模型与试验结果吻合较好.To study the hysteretic characteristics of corrosion steel plate in the neutral salt spray environment,steel specimens under different corrosion degree were got by sprinkling salt spray to accelerate corrosion. Then each specimen was subjected to cyclic loading test and analyzed the hysteretic behavior,Ramberg Osgood model was adopted to fit with the circular skeleton curve of steel,and model for hysteretic constitutive of corrosion steel was established based on the first time loading criterion,unloading criterion,cycle skeleton criterion and reloading curve criterion. The experimental results shows that： corrosive steel appeares the phenomenon of cyclic hardening and peak point pointing effect under cyclic loading; and the Ramberg Osgood model has better simulated results.With the corrosion degree increasing,the mechanical properties of the steel decrease,the deterioration of ductility becomes more serious and coefficient of steel circular enhancement shows a decreasing trend,whereas the variation of cyclic hardening exponent is not obvious. The proposed model agrees well with the experimental results.

关 键 词：中性盐雾 腐蚀钢板 滞回性能 骨架曲线 本构模型 

分 类 号：TU50[建筑科学—建筑技术科学]