摘要
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 a large number of strong motion records captured over the world every year,the records selection work is often required in structural dynamic analysis nowadays. First,the recordings from U. S. PEER NGA-West1 dataset and Chinese national strong motion observation network system（2007—2015） are collated to construct the dataset for records selection of Chinese seismic design code. The earthquake parameter and scale factor range for each seismic design group in Chinese seismic code are given based on the earthquake data distribution. Then a method is proposed to improve the performance of whole period range matching method by modification of the weight function based on its own error function. The whole procedure of records selection is proposed including the earthquake parameter range,scaling method and results verification. One 12 story and one 3 story 2 D RC frame are selected for dynamic time history analysis validation using recordings from the ATC-63 far filed dataset（44 recordings）. The maximum inter-story drift ratios of these two structures under different earthquake intensities prediction equations are established. The predicted maximum inter-story drift ratios are compared with the results using different recording selection methods. Considering the proposed method has closer median value and less variability in final results than tradition selection methods.Finally,the selected ground motion recordings for design earthquake spectrum in Chinese seismic code are given for reference considering the commonly used 7,8 and 9 earthquake intensity level,Ⅱsite.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2017年第12期57-67,共11页
Journal of Building Structures
基金
国家自然科学基金项目(51308515)
公益性地震行业科研专项(201508005)
黑龙江省科技基金项目(LC2015022)
关键词
强震记录选取
地震信息
全周期匹配
权重函数优化
抗震规范目标谱
strong ground motion selection
earthquake information
whole period matching
weight functionmodification
seismic design code target spectrum
