不同后续使用年限结构地震作用折减系数的探讨  

Discussion on reduction coefficient of earthquake action of structures with different continuing seismic service life

作　　者：孙魁 程绍革[1] SUN Kui;CHENG Shaoge(China Academy of Building Research, Institute of Earthquake Engineering, Beijing 100013, China)

机构地区：[1]中国建筑科学研究院工程抗震研究所,北京100013

出　　处：《地震工程与工程振动》2018年第3期48-54,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点研发计划课题(2016YFC0700700)~~

摘　　要：以均匀泊松模型作为地震发生概率模型,考虑震级和震源距的影响,探讨地震作用概率分布模型,给出其危险性曲线公式;根据我国近50年地震记录,采用不同方法对地震作用的极值分布参数进行估计;基于等超越概率原则,给出了不同后续使用年限结构的50设计基准期等效超越概率和地震作用计算公式;以现行规范为基准,给出了不同后续使用年限结构的地震作用折减系数计算方法及其建议取值。研究结果表明:地震作用概率分布属于极值Ⅱ型分布;在相同后续使用年限条件下,各设防水准对应的地震作用折减系数值相同。本研究匹配现行规范,为既有结构抗震鉴定加固研究及设计提供有益参考。The earthquake generation model was established based on the Homogeneous Poisson Process,the probability distribution of earthquake action was discussed with the influence of magnitude and focal distance,then seismic hazard curve formulas of peak ground acceleration( PGA) were obtained. Different methods were employed to estimate the extreme distribution parameters of earthquake action based on the seismic record in recent 50 years.Based on the equal exceeding probability principle,the calculation formulas was proposed to calculate exceeding probability of assessment intensities,while the exceeding probability based on the design reference period( 50 years). Based on the continuous seismic service life,an available approach according to current code was proposed to modify the corresponding earthquake action. The results have shown that: the probability distribution of earthquake action was embodied by Extreme Value Type Ⅱ. Under the same continuous seismic service life,the reduction coefficient is the same for different seismic fortification levels. The research match the current code and it also has reference for research and design of seismic appraisal and reinforcement for existing structures.

关 键 词：地震作用 极值Ⅱ型分布 后续使用年限 超越概率 抗震鉴定 

分 类 号：TU4[建筑科学—土工工程]