近海大气环境下锈蚀钢柱抗震性能试验研究

为了研究近海大气环境下锈蚀钢框架柱的抗震性能，通过人工气候环境模拟试验技术对6榀钢框架柱进行了近海大气环境下的加速腐蚀，并对腐蚀后试件进行低周往复加载试验，研究了不同锈蚀程度和轴压比对钢框架柱破坏机理、滞回曲线、骨架曲线、刚度退化、延性及耗能能力等指标的影响.试验结果表明：随着锈蚀程度增加，试件底端翼缘屈曲、腹板鼓曲及塑性铰形成所对应的位移呈减小趋势；试件承载能力、变形能力及耗能能力均有所降低.此外，随着轴压比的增大，试件发生局部屈曲现象提前；承载力及延性显著降低，强度和刚度退化速率加快，耗能变差.基于试验结果，初步确定锈蚀钢框架柱不同抗震性能水平和性能指标量化限值.研究成果为近海大气环境下在役钢框架结构的抗震性能评估提供了试验支撑.

Experimental Study on Seismic Performance of Corroded Steel Columns in Offshore Atmospheric Environment

In order to study the seismic performance of corroded steel frame columns in offshore atmospheric environment, an indoor artificial-climate accelerated test on six steel frame columns was implemented firstly. And then, low-cyclic reversed loading tests were conducted on the six corroded steel columns. The influence of corrosion levels and axial compression ratios on the failure modes, hysteretic curves, skeleton curves, stiffness degradation, ductility and energy dissipation capacity of the specimens was analyzed and discussed. The test results indicate that with the increase of corrosion level, the displacement corresponding to the flange local buckling, web local buckling and formation of plastic hinges gradually reduce, and the bearing capacity, deformation capacity and energy dissipation capacity of specimens decrease as well. In addition, with the increase of axial compression ratio, the occurrence of local buckling is advanced, the load bearing capacity and ductility decrease obviously, the strength and stiffness degenerate significantly, and the energy dissipation capacity degrades. Based on the test results, the seismic performance levels and quantitative limits of performance index for the corroded steel frame columns were preliminarily determined. This study can provide experimental support for the seismic performance evaluation of existing steel structures in offshore atmospheric environment.