中性盐雾环境锈蚀H型钢柱抗震性能试验研究

通过7根锈蚀H型钢柱的低周往复荷载试验，研究锈蚀对H型钢柱破坏形态、承载力、变形、延性、耗能等方面的影响。结果表明: 锈蚀钢柱的翼缘和腹板变形范围及屈曲中心高度呈减小趋势，部分钢柱屈曲中心高度降低了约30%；随着质量损失率增加，滞回环梭型饱满程度越低，所包围的面积越来越小；钢柱的承载力下降明显；钢柱位移延性系数及累积滞回耗能不断减小，并基于试验数据建立了锈蚀H型钢柱位移延性系数的退化模型及累积滞回耗能与循环次数的关系。锈蚀导致钢柱截面面积减小，同时点蚀的存在引起应力集中，减弱了其塑性变形能力。反复荷载作用下，钢柱塑性变形累积，局部屈曲导致承载力下降，抗震性能降低。

Experimental study on seismic behavior of corroded H-shaped steel columns under neutral salt spray environment

The effects of corrosion on the failure mode, bearing capacity, deformation, ductility and energy consumption of H-shaped steel columns were studied by low cycle reversed load tests of seven corroded H-shaped steel columns. The results show that the flange and web deformation range and buckling center of the corroded specimens decrease and for some of the specimens the buckling center are reduced by 30%. With the increase of mass loss rate, the degree of fullness of hysteresis loops becomes increasingly smaller. The bearing capacity of the specimen decreases obviously. The displacement ductility coefficient and cumulative hysteretic energy consumption decrease continuously. Based on the experimental data, the degradation model of displacement ductility coefficient of corroded H-shaped steel columns and the relationship between cumulative hysteretic energy consumption and number of cycles are established. The corrosion results in the reduction of the cross-section area of the specimens, and the pitting corrosion leads to stress concentration which consequently weakens the plastic deformation ability. Under repeated loading, the plastic deformation accumulates, and the buckling deformation leads to the decrease of bearing capacity and seismic performance.