基于动力能力谱法的RC结构位移放大系数

发布时间：2018-04-24 04:40

本文选题：动力能力谱方法 + 静力能力谱方法　；参考：《振动与冲击》2016年24期

【摘要】：结构位移放大系数是预测结构在某一地震设防水准作用下的最大弹塑性变形,从而指导结构设计的参数。我国现行抗震设计规范尚未引入结构位移放大系数。考虑6、7、8三个设防烈度,设计了3、5、8、10、12层共15个钢筋混凝土框架结构,建立其有限元模型,并采用结构振动台试验对有限元模型进行验证,进而对结构在地震作用下的反应进行分析。采用文中提出的动力能力谱方法,研究按我国抗震设计规范设计的RC框架结构在不同设防水准下的位移放大系数需求值,并与传统静力能力谱法得到的位移放大系数需求值进行对比分析。6、7、8度设防的RC框架结构的位移放大系数需求值在中震作用下分别为0.51~1.91、0.49~1.93、0.56~2.24;在大震作用下分别为1.28~4.82、1.40~4.89、1.37~5.56。中震作用下,按我国抗震设计规范设计的钢筋混凝土框架结构未发生整体屈服,表明我国抗震设计规范比较保守。
[Abstract]:The structural displacement magnification factor (DMF) is used to predict the maximum elastoplastic deformation of the structure under the action of a certain earthquake fortification leveling, so as to guide the structural design parameters. The structural displacement magnification factor has not been introduced into the current seismic design code in China. Considering three fortification intensities, 15 reinforced concrete frame structures were designed and their finite element model was established. The finite element model was verified by vibration table test, and the response of the structure under earthquake was analyzed. The dynamic capacity spectrum method proposed in this paper is used to study the displacement magnification factor requirements of RC frame structures designed according to the seismic design code of China under different fortification levels. The results are compared with those obtained by traditional static capacity spectrum method. The displacement magnification factor of RC frame structure with 6 ~ 7 ~ 8 degree fortification is 0.51 ~ 1.91 ~ 0.49 ~ 1.93 ~ 0.56 ~ 2.24 under moderate earthquake respectively, and 1.284.821.40 ~ 4.890 ~ 1.37 ~ (1.37) ~ 5.56 under the action of a large earthquake respectively, and the displacement magnification coefficient of RC frame structure under moderate earthquake is 1.284.821.40 ~ 4.890 ~ (1.37) ~ (1.37) ~ 5.56 respectively under the action of moderate earthquake. Under the action of moderate earthquake, the reinforced concrete frame structure designed according to the seismic design code of our country did not yield as a whole, which indicates that the seismic design code of our country is conservative.
【作者单位】：福州大学土木工程学院;东南大学土木工程学院;福建工程学院土木工程学院;
【基金】：国家自然科学基金(51408131;51478118;51508099) 福建省科技厅引导性项目(2016Y0061) 福建省教育厅科技项目(JA15351)
【分类号】：TU375;TU352.11

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