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为研究酸性大气环境下锈蚀钢框架结构的整体抗震性能,设计了2个不同锈蚀程度(S1、S2)的5层空间钢框架结构。利用气雾腐蚀箱对酸性大气环境进行人工模拟并对S2进行加速腐蚀(S1未锈蚀作为对比)。分别对2个结构进行振动台试验,测定了不同锈蚀程度钢框架结构的动力特性及加速度、位移、应变反应和破坏特征,研究了钢框架结构的地震响应随钢材锈蚀程度增大的变化规律。试验结果表明:锈蚀对整体结构的影响主要表现为:结构自振频率下降7.46%~9.76%,阻尼比、位移、应变增大,加速度反应、剪力响应明显降低;S1与S2的破坏形式基本相同,均为钢框架梁端部发生局部屈曲破坏,S2塑性变形程度较S1增大;8度多遇时,S1、S2地震响应相差不显著,随地震强度的增大,两者地震响应差异越明显;研究成果可为进行锈蚀钢框架的安全性评估提供试验支持。
In order to study the overall seismic performance of rusted steel frame structures in acidic atmosphere, two 5-story space steel frame structures with different degrees of corrosion (S1, S2) were designed. The aerosol corrosion chamber was used for artificial simulation of the acidic atmosphere and S2 was accelerated for corrosion (S1 was not rusted for comparison). Shaking table tests were performed on the two structures respectively, and the dynamic characteristics and acceleration, displacement, strain response and failure characteristics of the steel frames with different degrees of corrosion were measured. The variation law of the seismic response of the steel frame structure with increasing steel corrosion was studied. The test results show that the effect of corrosion on the overall structure is as follows: the natural vibration frequency of the structure decreases by 7.46% to 9.76%. The damping ratio, displacement, and strain increase, and the acceleration response and shear response decrease significantly; the destruction modes of S1 and S2 are basically the same In the same way, local buckling failure occurs at the ends of the steel frame beams, and the S2 plastic deformation degree is greater than S1; when the degree is more than 8 degrees, the seismic responses of S1 and S2 are not significantly different. As the seismic intensity increases, the seismic response differences between the two are different. The more obvious, the research results can provide experimental support for the safety evaluation of corroded steel frames.