TIME-VARYING SEISMIC DAMAGE OF STEEL FRAME JOINTS CONSIDERING ATMOSPHERIC ENVIRONMENT
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摘要: 已服役的结构由于所处的环境作用，其构件力学性能必将随时间不断劣化。基于12个不同锈蚀程度钢框架节点的低周往复试验，分析近海大气环境作用导致钢框架节点构件力学性能的劣化。考虑到钢框架节点在地震作用变形达不到其变形极限，因而不适宜采用变形能力作为参数评价其损伤程度。刚度指标能够反映构件承载力与变形两个性能指标，且构件的变形与其刚度成反比，建立能够考虑构件因环境作用而引起的初始损伤的基于构件刚度与耗能的双参数地震损伤模型。由试验数据回归得到构件的刚度与累积耗能能力与锈蚀率线性相关，并验算损伤模型的计算精度。研究表明：建立的损伤模型具有较高的计算精度，且计算方便，适用于对地震作用下的钢框架节点进行损伤描述。在损伤模型的基础之上，假定构件年锈蚀率相同，建立构件考虑环境作用的时变损伤模型。Abstract: Due to environmental effects, mechanical properties of structures deteriorate with time. Based on low cycle tests of 12 steel frames with varying degrees of corrosion, the deterioration of mechanical properties of steel frame joints was analyzed. Considering that the deformation of steel frame joints is less than the deformation limit, it is not suitable to evaluate the degree of damage of the steel frame. The stiffness index can reflect two performance indexes of the bearing capacity and the deformation of the member, and the deformation of the member is inversely proportional to its stiffness. A two-parameter seismic damage model based on component stiffness and energy dissipation was established to consider the initial damage caused by environmental factors. The stiffness of the component and the cumulative energy dissipation capacity were linearly related to the corrosion rate. The computational accuracy of the damage model was checked by the regression of the experimental data. The results showed that the damage model had high computational accuracy and was easy to calculate, and it was suitable for damage description of steel frame joints under earthquake actions. Based on the damage model, it was assumed that the annual corrosion rate of the components was the same, and the time-varying damage model considering the environmental action was established.
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