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| | The seismic activity data and water level data in the epicenter and its vicinity of the M 5.4 earthquake in north of Yibin County in 1996 are analyzed. The result shows that before the main shock, middle and small earthquakes active abnormally, anomalies of many seismic parameter and mode, include b value, occurred, water level anomaly in Chuan #12 well was significant. The distinctive macro phenomenon of the shallow layer gas emitting abruptly on the axis of Dengguan anticline is also investiga... | | 通过对1996年四川省宜宾北5.4级地震震中,及附近地区地震活动性资料、水位资料的分析,结果表明,震前中小地震异常活跃,b值等多项地震学参数和方法出现明显异常,川12井水位异常显著,还调查分析了邓关背斜轴部出现的突冒浅层天然气的独特宏观异常现象。这些异常特征的分析和研究,对本区未来中强地震的震情分析和跟踪有一定的启示。 | | 文摘来源 | | With rapid development of underground structure, it is very urgent to solve the problem of reevaluating the underground structure's anti-earthquake stability because of many damages caused by earthquakes. Using methods of cyclic triaxial test and resonant column triaxial test, a seismic analyzing model is established in the paper which is based on the seismic stress-strain relation of Shanghai soft soil, the rising law of pore water pressure and the law of settlement induced by seism. Base... | | 在软土室内动力试验和有限元有效应力动力反应分析方法的基础上,引进可靠度理论,提出软土地下建筑物抗震稳定可靠性分析方法,对上海地铁一号线位于砂性土层及粘性土层这两种典型地质条件下的地铁车站及区间隧道的抗震稳定性进行了计算分析。计算中选用国内外6条强震地震记录曲线作为地震输入,计算分析内容包括:隧道、地铁车站、周围土体及注浆材料的动应力、孔隙水压力和震陷;地铁车站和周围土体的动力可靠度。所得结论可为软土地下建筑物抗震设计提供参考依据。 | | 文摘来源 | | The initial stiffness has an important effect in classing the connections and seismic analyzing of steel structure,so it is very actual signification to study the initial stiffness of connections.This paper presents the methods of determining the initial stiffness of top seat angles connections and shows the main factors of influencing it. | | 初始连接刚度在节点刚度分类和钢结构地震分析中占有很重要的地位 ,因此研究连接的初始刚度很有现实意义 ,主要研究顶底角钢连接的初始刚度的确定方法以及影响其的主要因素 | | 文摘来源 | |   | | << 更多相关文摘 |
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