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为研究各国典型钢材作为芯材后对屈曲约束支撑在地震作用下的耗能能力、等效附加阻尼比等抗震性能的影响,本文对比了我国的Q345GJ、日本的SN490B和美国的A36钢材的延性指标和参数,利用大型通用有限元软件ABAQUS对中日美三种典型钢材作为防屈曲支撑芯材的一字型支撑构件进行了非线性有限元数值分析。结果表明,在屈曲约束支撑长度和形式相同的条件下,不同钢材等级的芯材对屈曲约束支撑构件的等效附加阻尼比和耗能性能影响显著,为防屈曲支撑构件的设计和应用提供借鉴。
In order to study the impact of buckling restrained brace on seismic capacity, equivalent anti-seismic performance such as equivalent damping ratio, this paper compares the ductility of China’s Q345GJ, Japan’s SN490B and American A36 steel Index and parameters, the non-linear finite element numerical analysis of the monolithic support members of the three kinds of typical steel materials as the anti-buckling support core materials are carried out by the large-scale general finite element software ABAQUS. The results show that under the condition of the same buckling restraint length and form, the core steel with different grades of steel has a significant effect on the equivalent additional damping ratio and energy dissipation performance of the buckling-restrained brace, providing a reference for the design and application of the buckling restraining brace .