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随着国内外强震记录的积累和结构时程分析的广泛应用,抗震设计中强震记录的选取作为重要的基础性工作受到广泛关注。以我国现行建筑抗震设计规范中的天然强震记录选取为研究对象,基于美国PEER的NGA-West1数据库和我国数字强震台网2007—2015年强震记录数据建立备选数据库,对地震信息筛选条件以及调幅系数区间做了分别研究,提出了利用全周期段匹配结果进行权重函数优化,整理总结了一套系统的包含地震信息筛选、调幅匹配以及筛选验证的完整强震记录选取流程,并选用12层和3层典型平面混凝土框架对不同记录选取方案做了数值模拟验证,采用ATC-63推荐的远场数据集(44条)拟合了该结构的最大层间位移角预测模型,对比抗震设防烈度为7、8度设计目标谱工况下不同强震记录选取方案的数值分析结果,证明全周期段优化权重匹配记录选取方案数值模拟结果与预测响应具有较好一致性,且离散性要优于传统记录选取方案。最后针对常用的7度、8度以及9度罕遇地震作用下的Ⅱ类场地,对应于我国抗震规范目标谱给出了供工程、科研人员参考选用的记录数据集。
With the accumulation of strong earthquake records both at home and abroad and the extensive application of structural time history analysis, the selection of strong earthquake records in seismic design has drawn extensive attention as an important basic work. Taking the selection of natural strong earthquake records in the code of seismic design of buildings in our country as the research object, an alternative database was built based on the NGA-West1 database of PEER in the United States and the strong earthquake records from 2007 to 2015 of China Digital Strong Seismic Network. Seismic information screening Conditions and the range of the amplitude modulation coefficient are studied separately. The weight function optimization using the period matching results is proposed. A complete set of strong earthquake record selection process including seismic information screening, amplitude modulation matching and screening verification is summarized and selected The 12-story and 3-story typical planar concrete frames are validated by numerical simulation of different record selection schemes. The maximum inter-story drift angle prediction model of this structure is fitted by using the far-field dataset (44) recommended by ATC-63, The fortification intensity is the numerical analysis results of different strong earthquake record selection schemes under the design target spectrum condition of 7 and 8 degrees, which proves that the numerical simulation results of the optimal weight matching record selection scheme in the whole period segment are in good agreement with the predicted response, and the discreteness Better than traditional record selection scheme. Finally, according to the target category Ⅱ of common seismic intensity of 7 degree, 8 degree and 9 degree rare earthquakes, the record datasets for engineering and scientific research personnel are given.