地震影响系数的数值对比研究
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摘要
通过对地震影响系数曲线段表达式的数值对比分析,考虑抗震设防烈度、设计基本地震加速度、设计地震分组和场地类别4个场地地震条件参数的影响,提出地震影响系数对比常数的概念及表达式,求解并给出不同地震条件下对比常数的数值与图表,且对比常数是地震影响系数表达式自身固有的属性。在此基础上,对现行规范中最小地震剪力系数值的规定进行了剖析,提出其规定应考虑场地特征周期(场地类别、设计地震分组)的影响。依据对比常数,给出了最小地震剪力系数值的修正系数。对比常数和修正系数能客观综合地反映场地地震条件对结构地震反应大小的影响,可用来定量地分析和判别结构的地震作用水平。
Through the comparison analyses of expression values of earthquake affecting coefficient curves,the concept and expression of comparison constant for earthquake affecting coefficient were put forward considering the impacts of 4 site seismic condition parameters of fortification intensity, design basic acceleration, design earthquake group and site classification. The values and charts of comparison constants were solved and given under different earthquake conditions.The comparison constant was the inherent attributes of earthquake affecting coefficient expression. On this basis,the provisions of the minimum seismic shear coefficient value in current code were put forward. It was proposed that the code should consider the effects of site characteristic period including the site category and design earthquake group. Based on the comparison constant,the correction coefficient for the minimum seismic shear coefficient value was given. The comparison constant and correction coefficient can objectively reflect the comprehensive effect of site earthquake conditions on the earthquake action of the structure,and analyze and judge the earthquake action level of the structure quantitatively.
Through the comparison analyses of expression values of earthquake affecting coefficient curves,the concept and expression of comparison constant for earthquake affecting coefficient were put forward considering the impacts of 4 site seismic condition parameters of fortification intensity, design basic acceleration, design earthquake group and site classification. The values and charts of comparison constants were solved and given under different earthquake conditions.The comparison constant was the inherent attributes of earthquake affecting coefficient expression. On this basis,the provisions of the minimum seismic shear coefficient value in current code were put forward. It was proposed that the code should consider the effects of site characteristic period including the site category and design earthquake group. Based on the comparison constant,the correction coefficient for the minimum seismic shear coefficient value was given. The comparison constant and correction coefficient can objectively reflect the comprehensive effect of site earthquake conditions on the earthquake action of the structure,and analyze and judge the earthquake action level of the structure quantitatively.
引文
[1]方小周,魏琏.关于建筑结构抗震设计若干问题的讨论[J].建筑结构学报,2011,32(12):46-51.
[2]汪大绥,周建龙,姜文伟,等.超高层结构地震剪力系数的研究[C]//第十届中日建筑结构技术交流会论文集.南京,2013.
[3]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[4]DGJ 08-9—2003建筑抗震设计规程[S].上海:上海市建设工程标准定额管理总站,2003.
[2]汪大绥,周建龙,姜文伟,等.超高层结构地震剪力系数的研究[C]//第十届中日建筑结构技术交流会论文集.南京,2013.
[3]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[4]DGJ 08-9—2003建筑抗震设计规程[S].上海:上海市建设工程标准定额管理总站,2003.
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