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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.
In order to study the variation of hysteretic behavior of steel plates with different corrosiveness under neutral salt spray environment, the steel plate specimens with different corrosion degrees were obtained by artificial spraying salt spray to accelerate the corrosion. Then the cyclic loading tests of each group of specimens were obtained and obtained Hysteresis curve is analyzed to analyze its hysteretic behavior. At the same time, the Ramberg-Osgood model is used to fit the cyclic skeleton curve of steel, and the change rule of its coefficient is analyzed. Finally, based on the first loading criterion, unloading criterion, cyclic skeleton criterion and reloading curve criterion, The hysteresis constitutive model of steel was established.The experimental results show that the phenomenon of cyclic hardening and peak point pointing appears under the action of cyclic loading.The Ramberg-Osgood model is more suitable for fitting the model. With the increase of corrosion, The performance index decreased, the ductility deteriorated aggravate, and the cycle strengthening coefficient of steel showed a decreasing trend, while the cyclic enhancement index did not change obviously. The model was in good agreement with the experimental results.