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南京河西地区设计地震动研究 总被引：7，自引：3，他引：4
本文根据南京及周围地区的地震环境,采用概率法对南京河西地区某高层公寓工程场址进行了地震危险性分析,采用等效线性化模型考虑场地土的非线性特性的影响,并用一维波动模型进行了场址土层地震反应和场地地震动效应分析,给出了５０年超越概率６３％,１０％和３％的场址基岩和地表的水平向加速度反应谱值加速度。 相似文献
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北京地区中硬场地地震动效应研究 总被引：2，自引：0，他引：2
依据典型工程场地的地震安全性评价报告,研究北京地区中硬场地地震动效应。首先,统计分析了地震安全性评价结果中的场地地震动放大效应。再利用201个工程场地的钻孔资料进行土层地震反应计算,分析不同地震动输入下的场地地震动放大效应。结果表明,北京地区中硬场地地震动放大效应明显,得到的场地地震动峰值加速度转换系数Ka高于《中国地震动参数区划图》（GB18306-2001）中的值,大震水准下更为突出。因此,如在北京地区直接采用《中国地震动参数区划图》（GB18306-2001）中的调整系数,可能会低估北京地区中硬场地的地震动放大效应,降低抗震设防标准。最后指出,场地地震动峰值加速度转换系数明显具有区域性,应根据详细的场地地震动效应研究结果,合理地确定场地地震动转换系数。 相似文献
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地震安全性评价中工程场地设计地震动通常采用一维等效线性化水平成层的分析模型，但对一些较复杂的场地条件，如蓄能电站所处场地，仅考虑一维场地是不够的，而需考虑二维场地的影响。常规采用的二维有限元很难考虑诸多因素，为工程设计带来了很大的困难。提出了可考虑二维复杂工程场地影响的设计地震动的修正分析方法和简化方法，该方法还可考虑非线性对场地的影响及吸能边界等因素，而且计算简单，并易于同常用的一维等效线性化方法结合。实例分析结果合理，对工程场地地震动的确定具有重要意义。 相似文献
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不同类别场地地震动参数的计算分析 总被引：45，自引：2，他引：45
基于188个工程场地计算剖面及场地地震反应分析的等线性化波动分析方法，通过对场地地震反应的计算及计算结果的分析，研究了4类场地条件对场地地震动影响的特点及规律，给出了每一类场地地震动参数变化的经验关系。 相似文献
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将土非线性分析的等效线性化方法与随机工程波动散射问题的求解方法相结合，建立了开放系统中非一致激励条件下考虑岩土介质非线性的工程场地地震动随机场数值模拟方法并研究了介质非线性对场地地震动相干性的影响。分析结果表明：与不考虑非线性相比，在地震过程中，场地土介质的非线性改变了复杂场地的局部特性从而导致场地地震动空间相干性的变化，因此有必要在场地地震动相干函数的分析中考虑场地介质非线性特性对地震动相干性的影响。 相似文献
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将随机结构正交展开理论和随机振动分析的虚拟激励原理运用于场地波动有限元分析，形成了一种可以考虑岩土介质随机特性对工程场地地震动相干函数影响的分析方法。实例分析表明，非严格均匀分布的随机介质场地对场地表面的迟滞相干函数值有重要影响，这种影响可由场地的随机影响因子来衡量，在进行工程场地地震动随机场研究时应当考虑场地介质随机特性的影响。 相似文献
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近断层地震动由于其自身不同于远场地震动的特征以及对工程结构产生的严重破坏,成为近年来工程地震界的研究热点。近断层地震动的影响因素众多,除常规的震源、路径以及场地条件之外,上/下盘效应和破裂方向性效应的影响较为突出,两者对近断层地震动的峰 相似文献
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M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
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《地震工程与工程振动(英文版)》2014,(4)
正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and 相似文献
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George W. Housner 《地震工程与工程振动(英文版)》2008,7(2):I0001-I0001
Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States. 相似文献
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《国际泥沙研究》2014,(4)
正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study 相似文献
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JianCheng Shi 《中国科学:地球科学(英文版)》2014,57(10):2281-2282
正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases 相似文献