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基于强度折减系数的抗震设计方法,将增量动力分析(IDA)和能力谱法(CSM)结合,对典型梁贯通式支撑钢框架结构的强度折减系数进行研究。采用结构试验校准后的有限元分析模型对结构进行分析,得到结构性能点。通过比较按照设防烈度弹性设计的基底剪力V e和按照小震设计的基底剪力V d得到强度折减系数R。分析表明:支撑与框架柱的配置比例及布置方式会对此类结构的强度折减系数产生影响;适用于7度设防烈度的典型两层结构两种支撑配置比例(CASE1和CASE2一层与二层支撑配置比例分别为3∶1和2∶1)梁贯通式支撑钢框架结构体系的强度折减系数可分别取为3.02和2.54。最后建议了该新型结构体系考虑强度折减系数并基于我国现行规范进行抗震设计的地震作用取值范围。
Based on the aseismic design method of strength reduction coefficient, the strength reduction coefficient of a typical through-beam supported steel frame structure is studied by combining incremental dynamic analysis (IDA) and power spectrum method (CSM). Structural analysis of the finite element analysis model used to analyze the structure to obtain structural performance points. The strength reduction factor R is obtained by comparing the base shear V e designed according to the fortification intensity elasticity with the base shear V d designed according to the small earthquake. The analysis shows that the ratio and arrangement of support and frame columns will affect the strength reduction coefficient of this kind of structure. The ratio of two kinds of support configurations for typical two-layer structure with 7-degree fortification intensity (CASE1 and CASE2 layers one and two Layer support configuration ratio of 3: 1 and 2: 1 respectively) The strength reduction coefficient of the through-beam steel frame structure can be taken as 3.02 and 2.54 respectively. Finally, the new structural system is proposed to consider the strength reduction factor and to select the range of earthquake action based on the current codes in our country.