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对剪切滑移滞回模型的单自由度体系在地震作用下的响应进行了分析,目的是与理想弹塑性滞回曲线模型的结果相比较以考察耗能能力的影响。得到了不同场地、结构自振周期、延性、阻尼比、后期刚度系数等参数组合下的结构影响系数R。结果表明:R谱的决定性因素是结构的延性,延性越大结构影响系数越大;对耗能能力的影响,则要区分结构周期的长短,对于短周期结构,耗能能力有比较显著的有利影响,而对于中长周期的结构,在统计平均的意义上讲,耗能能力的有利影响不显著。阻尼比、后期刚度对R系数的影响是第三位的,而且阻尼只在短周期范围内有比较明显的影响。对R谱的横轴采用特征周期标准化,保留了R谱在特征周期处的峰值特征。对各标准化周期和延性下的R进行了统计分析。将R表示成延性、阻尼比和后期刚度的函数,提出了结构影响系数的计算公式。
The response of the single-degree-of-freedom system to shear-slip hysteresis model under earthquake action is analyzed in order to compare the results with the ideal elastoplastic hysteresis curve model to examine the impact of energy dissipation capability. The structural influence coefficient R under different combinations of the site, the natural period of the structure, the ductility, the damping ratio, the late stiffness coefficient and other parameters were obtained. The results show that the decisive factor of R spectrum is the ductility of the structure, the larger the ductility is, the larger the influence coefficient of the structure is. The influence of the energy dissipation capacity is to distinguish the length of the structure period and the energy consumption ability of the short period structure is more significant However, for the medium-long cycle structure, the beneficial effect of energy consumption capacity is not statistically significant. Damping ratio, the late stiffness of the R coefficient is the third place, and the damping only in the short cycle has a more obvious impact. The horizontal axis of R spectrum is standardized by the characteristic period, which preserves the peak characteristics of the R spectrum at the characteristic period. The statistical analysis of R under each standardized period and ductility was carried out. R is expressed as a function of ductility, damping ratio and stiffness at a later stage, and the calculation formula of structural influence coefficient is proposed.