多层轻钢框架结构的抗震性能分析

ANALYSIS OF ASEISMIC PROPERTIES OF LIGHT-WEIGHT STEEL MULTI-STOREY STRUCTURE

多层轻钢结构是目前国内外应用和发展速度最快的轻型结构形式,目前国内外对这种结构的静力性能研究较多,而动力分析结果不多见。运用ANSYS有限元计算软件对一个具体工程的动力特性进行分析(模态分析、振型分解反应谱分析、弹性/弹塑性时程分析),并与专用软件PKPM的计算结果进行对比分析。计算表明,轻钢屋面顶层的鞭梢作用存在,但相对而言,结构底层受地震作用更为严重。

Light-weight steel multi-storey Structures are widely used and developing rapidly all over the world. At the present time, much work on the study of the static behavior has been done; but the analysis of the dynamic properties is rare. Taking a specific engineering as an. example, the dynamic properties are analyzed by the finite element software ANSYS, including modal analysis, spectrum analysis, elastoplastic tlme-history analysis, whose results are compared with those of PKPM. The result shows, the whiplash effect exists, but in comparison, the ground floor is affected more severely in earthquake.