酸性大气环境下多龄期平面钢框架结构抗震性能试验研究

EXPERIMENTAL RESEARCH ON THE SEISMIC BEHAVIOR OF MULTI-AGED PLANAR STEEL FRAMES UNDER ACIDIC ATMOSPHERIC ENVIRONMENT

为研究酸性大气环境下锈蚀对钢材力学性能和平面钢框架结构抗震性能的影响,利用人工气候加速腐蚀试验技术对21组钢材材性试件和4榀平面钢框架结构进行加速腐蚀,并分别对其进行拉伸试验和拟静力试验。拟合拉伸试验数据,得到钢材力学性能(屈服强度、极限强度、伸长率和弹性模量)与失重率之间的线性回归关系;通过拟静力试验,分析了不同锈蚀程度对平面钢框架结构抗震性能(荷载-位移曲线、骨架曲线、强度和刚度退化、耗能能力等)的影响,得到不同锈蚀程度下平面钢框架结构抗震性能的衰退规律。结果表明,锈蚀对平面钢框架结构的抗震性能有着显著的影响,随着锈蚀程度的加剧,平面钢框架结构的极限承载力和耗能能力明显降低,强度和刚度退化严重,而且脆性破坏显著。

To study the impact of corrosion on steel mechanical properties and the seismic performance of planar steel frames in the acidic atmospheric environment, 21 groups of standard steel material specimens and 4 steel frames corroded by artificial climate accelerated corrosion testing technique were tested under tensile loading and quasi-static loading, respectively. Based on the tensile test data, the linear regression relationship between the steel mechanical properties （yield strength, ultimate strength, elongation and elastic modulus） and weightlessness rate is established. Through the quasi-static test, the influence of different corrosion degrees on the seismic performance of planar steel frame （load-displacement curve, skeleton curve, strength and stiffness degradation, hysteretic energy of steel frame, etc.） are analyzed. The degradation laws of the seismic performance of the specimens under different corrosion degrees are established. The results show that corrosion has a significant impact on the seismic performance of planar steel frames. The ultimate load-bearing capacity and energy dissipation capacity decrease with the increase of the corrosion degree, while the strength and stiffness degrade and the brittle fracture is obvious.