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胡聿贤 《地震工程与工程振动(英文版)》2003,2(1):35-38
Current design criteria and principles of earthquake engineering design are reviewed, including safety factors, probabilistic
approach, and two-level and multi-level functional design ideas. The modern multi-functional idea is discussed in greater
details. When designing a structure, its resistance to and the intensity of the earthquake action are considered. The consequence
of failure of the structure is considered only through a rough and empirical factor of importance, ranging usually from 1.0
to 1.5. This paper suggests a method of “consequence-based design,” which considers the consequences of malfunctioning instead
of simply an importance factor. The main argument for this method is that damage to a structure located in different types
of societies may have very different consequences, which are dependant on its value and usefulness to the society and the
seismicity in the region. 相似文献
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关于通过烈度资料估计地震动的研究 总被引：5，自引：0，他引：5
本文首先回顾了用烈度资料估计地震动参数衰减关系的现有方法,分析了其中存在的问题,进而提出地震烈度与地震动参数的更合理的转换模型。地震动衰减模型中采用了与震源体大小相关的近场距离饱和因子,使换算模型能体现与近场高烈度相应的地震动峰值的饱和特性。确定衰减关系时除了考虑地震动或烈度的不确定性之外,还包含了震级M和距离R的不确定性,烈度衰减关系的确定考虑了场地原始烈度点与等震线的差别,使参与换算的地震动和烈度均取自于同一地点。文中还对转换所得地震动衰减关系的方差进行了合理估计,换算结果的不确定性综合了参考地区用原始资料进行烈度与地震动换算的离散性和参考地区与研究地区烈度衰减规律不确定性的差异,使之与当前人们对地震动不确定性的认识水平相协调。新模型不受烈度和地震动参数衰减规律形式的限制。用新方法确定了华北、华南、西南、西北等四区的地震动幅值的衰减规律,并与华北、西南两区取得的少量强震记录进行了比较,结果甚为吻合。 相似文献
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不确定性概念的合理描述及其处理方法 总被引：5，自引：0，他引：5
在实际中,经常需要合理描述并处理各种不确定性。目前,在对不确定性的处理中,常出现将原本是不确定性的概念用习惯性的确定性方法表达并处理的矛盾做法。针对这种现象,本文指出了它的不足,同时给出了合理的不确定性描述及其处理方法。文中还利用实例分析了处理方法不同带来的影响。 相似文献
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Ｓｙｎｔｈｅｓｉｓｏｆａｃｃｅｌｅｒａｔｉｏｎｓｏｆｔｈｅ１９７６Ｔａｎｇｓｈａｎｅａｒｔｈｑｕａｋｅ（ＭＳ７．８）ｉｎｎｅａｒａｎｄｆａｒｆｉｅｌｄｂｙｕｓｉｎｇｓｅｍｉｅｍｐｉｒｉｃａｌｍｅｔｈｏｄＱＩＦＥＮＧＬＵＯ１）（罗奇峰）ＹＵ?.. 相似文献
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ＳｔｕｄｙｏｎｓｉｍｕｌａｔｉｏｎｏｆｓｐａｔｉａｌｃｏｒｒｅｌａｔｉｖｅｅａｒｔｈｑｕａｋｅｇｒｏｕｎｄｍｏｔｉｏｎｆｉｅｌｄＸＩＡＯ－ＪＵＮＬＩ（李小军）ＦＥＮＧ－ＸＩＮＺＨＡＯ（赵凤新）ＹＵ－ＸＩＡＮＨＵ（胡聿贤）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏ... 相似文献
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Recording-based identification of site liquefaction 总被引：2，自引：0，他引：2
Reconnaissance reports and pertinent research on seismic hazards show that liquefaction is one of the key sources of damage to geotechnical and structural engineering systems. Therefore, identifying site liquefaction conditions plays an important role in seismic hazard mitigation. One of the widely used approaches for detecting liquefaction is based on the time-frequency analysis of ground motion recordings, in which short-time Fourier transform is typically used. It is known that recordings at a site with liquefaction are the result of nonlinear responses of seismic waves propagating in the liquefied layers underneath the site. Moreover, Fourier transform is not effective in characterizing such dynamic features as time-dependent frequency of the recordings rooted in nonlinear responses. Therefore, the aforementioned approach may not be intrinsically effective in detecting liquefaction. An alternative to the Fourier-based approach is presented in this study, which proposes time-frequency analysis of earthquake ground motion recordings with the aid of the Hilbert-Huang transform （HHT）, and offers justification for the HHT in addressing the liquefaction features shown in the recordings. The paper then defines the predominant instantaneous frequency （PIF） and introduces the PiF-related motion features to identify liquefaction conditions at a given site. Analysis of 29 recorded data sets at different site conditions shows that the proposed approach is effective in detecting site liquefaction in comparison with other methods. 相似文献
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Hilbert spectrum and intrinsic oscillation mode of dynamic response of a bilinear SDOF system： influence of harmonic excitation amplitude 总被引：1，自引：0，他引：1
Under harmonic wave excitation, the dynamic response of a bilinear SDOF system can be expressed by the Hilbert spectrum. The Hilbert spectrum can be formulated by (1) the inter-wave combination mechanism between the steady response and the transient response when the system behaves linearly, or (2) the intra-wave modulation mechanism embedded in one intrinsic mode function (IMF) component when the system behaves nonlinearly. The temporal variation of the instantaneous frequency of the IMF component is consistent with the system nonlinear behavior of yielding and unloading. As a thorough study of this fundamental structural dynamics problem, this article investigates the influence of the amplitude of the harmonic wave excitation on the Hilbert spectrum and the intrinsic oscillatory mode of the dynamic response of a bilinear SDOF system. 相似文献
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ＴｈｅｒｅｌａｔｉｏｎｂｅｔｗｅｅｎｔｈｅｒｅｓｐｏｎｓｅｓｐｅｃｔｒｕｍａｎｄｔｈｅｐｈａｓｅｄｉｆｅｒｅｎｃｅｓｐｅｃｔｒｕｍＦＥＮＧ－ＸＩＮＺＨＡＯ（赵凤新）ａｎｄＹＵ－ＸＩＡＮＨＵ（胡聿贤）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，Ｓｔａ... 相似文献