单自由度体系损伤谱及其应用研究

SDOF System Damage Spectra and Their Application

为合理地揭示结构在地震作用下的弹塑性行为,该文考虑结构最大弹塑性位移和累积滞回耗能的耦合影响,建立了单自由度(SDOF)体系损伤谱,提出了一种基于损伤谱的抗震性能评价方法。依据Park-Ang双参数地震损伤模型,通过大量的SDOF弹塑性时程分析计算,建立了基于强度折减系数的4类场地损伤谱。在统计平均和回归分析的基础上,得到了简化的损伤谱表达形式。算例验证了基于损伤谱的抗震性能评价方法的合理性。算例分析表明,按该文方法可以合理考虑累积滞回耗能对结构损伤的影响,其计算结果与时程分析结果具有较好的一致性,因而能够从统计意义上对结构的损伤程度进行评价。

To reveal reasonably the elasto-plastic performance of structures under earthquake, the coupling effect of the maximum elasto-plastic displacement and accumulated hysteretic energy is considered. Damage spectra of single degree of freedom（SDOF） systems are built and a spectra-based aseismatic evaluation method is proposed. In the light of Park-Ang bi-parameter seismic damage model, damage spectra of four-class sites based on strength reduction factor are established after lots of SDOF inelastic time history analysis. Simplified functional expression of damage spectra is evaluated by statistical mean method and regression analysis. An example is used to confirm the validity of the spectra-based aseismatic performance evaluation method. The example analysis shows that： the method proposed here is reasonable to consider the impact of the cumulative hysteretic energy on the structural damage. The results from the method have good consistency with the time history analysis results. It can assess the extent of structural damage from the statistical viewpoint.