隔震结构中最小地震剪力系数合理取值研究
关洪成 , 唐曹明 , 罗开海 , 黄世敏 , 魏明杰 , 吴乐乐
结构工程师 ›› 2026, Vol. 42 ›› Issue (01) : 65 -74.
隔震结构中最小地震剪力系数合理取值研究
Study on the Rational Range of the Minimum Seismic Shear Force Coefficient in Seismically Isolated Structures
为探讨隔震结构设计中最小地震剪力系数的合理取值,采用2自由度简化隔震模型,运用振型分解反应谱法和时程分析法,推导、计算其底部剪重比,与《建筑隔震设计标准》中所规定的最小地震剪力系数限值进行对比,并通过实际工程对最小地震剪力系数取值进行了分析验证。结果表明:[2.0~5.2)s等效周期范围内,上述两种分析方法得出的剪重比均大于《建筑隔震设计标准》中的最小地震剪力系数限值,等效周期在[5.2~6.0]s时小于《建筑隔震设计标准》中限值;在较宽的等效周期范围内,现行《建筑隔震设计标准》中的最小地震剪力系数限值不起控制作用;故建议适当提高《建筑隔震设计标准》中最小地震剪力系数限值,确保结构具有一定的抗震安全性。
To ensure the rational range of the minimum seismic shear force coefficient in seismically isolated structures, this study adopts a simplified two-degree-of-freedom seismically isolated model. Using both the Modal Decomposition Response Spectrum Method and Time-History Analysis, the base shear-weight ratio is derived and calculated. The research compares the base shear-weight ratio with the minimum seismic shear coefficient specified in the Standard for Seismic Isolation Design of Building. Through practical engineering cases, the selection of the minimum seismic shear coefficient is analyzed and verified.The study shows that within an equivalent period range of 2 to 5.2 seconds, both analytical methods yield consistent results, indicating that the shear-weight ratios satisfy the minimum seismic shear coefficient limit requirements. However, within the equivalent period range of 5.2 to 6 seconds, the results do not meet the limits specified in the design standard. The research clarifies that across a wide equivalent period range, the minimum seismic shear coefficient limit stipulated in the current design standard does not exert a controlling effect. It is recommended to raise the standard limit value of the minimum seismic shear coefficient in the design standard to ensure sufficient seismic safety of structures.
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