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 As is suggested in the paper it is necessary to study the earthquake action for assessment of existing structures and the concept of assessment datum term and of assessment intensity is introduced. According to the existing distribution of intensity, the probability model of earthquake intensity which takes different assessment datum term and different area earthquake risk into account is established. Based on the equal exceeding probability principle, the standard and method are proposed to determine the earthquake... As is suggested in the paper it is necessary to study the earthquake action for assessment of existing structures and the concept of assessment datum term and of assessment intensity is introduced. According to the existing distribution of intensity, the probability model of earthquake intensity which takes different assessment datum term and different area earthquake risk into account is established. Based on the equal exceeding probability principle, the standard and method are proposed to determine the earthquake intensity for seismic assessment of existing structures, and parameters of earthquake action for strength checking and deformation checking are also given in the paper. In addition, the adjustment suggestion is put forward for those structures which have suffered from earthquakes in previous service term. In this way, a proper earthquake action standard is offered for seismic security assessment of existing structures.  本文阐述了研究在役结构评估用地震作用取值的必要性,并提出了评估基准期和评估烈度的概念;根据现有的烈度分布函数,建立了考虑不同评估基准期和不同地区地震危险性差异的地震烈度概率模型;按照等超越概率原则,提出了确定在役结构抗震评估用地震烈度的取值标准和方法,并给出了强度验算和变形验算地震作用参数的具体取值;对服役期间已遭遇过地震的结构,提出了烈度调整建议,为在役结构的抗震安全性评估提供了合理可行的荷载标准.  According to difference in the characteristics of the existing structure from design structure, this paper defines the defense intensity of the existing construction during succeed use period. In order to strengthen antiseismic administration in reconstruction city at present, some decision method, such as method of equal intensity, method of equal exceed probability, method of equal occurrence ratio, for defense intensity in succeed use period of existing construction were provided. It is useful for the discussion... According to difference in the characteristics of the existing structure from design structure, this paper defines the defense intensity of the existing construction during succeed use period. In order to strengthen antiseismic administration in reconstruction city at present, some decision method, such as method of equal intensity, method of equal exceed probability, method of equal occurrence ratio, for defense intensity in succeed use period of existing construction were provided. It is useful for the discussion on increase of antiseismic standard (defense intensity) on city, variation of buildingfunction and the antiseismic endurance of construction.  根据在役结构的“后验性”、时变性,“耐久性”特点,针对目前我国在城市改造与抗震 加固中出现的在役结构后续使用期(后役期)防御烈度形式:等烈度、等超越概率、等发生率 方法,详细分析了它们的风险特点,并提出了作者的看法．  The concept of assessment reference period is put forward.The relation among exceeding probability,recurrence period and annual mean incidence of intensity is deduced.The recurrence periods of minor,moderate and major earthquake in different reservice periods are calculated based on equal exceeding principle.The method of determining basic intensity,frequent intensity and rare intensity,together with their relation is presented using the reference of the latest research findings of earthquake hazard analysis.And... The concept of assessment reference period is put forward.The relation among exceeding probability,recurrence period and annual mean incidence of intensity is deduced.The recurrence periods of minor,moderate and major earthquake in different reservice periods are calculated based on equal exceeding principle.The method of determining basic intensity,frequent intensity and rare intensity,together with their relation is presented using the reference of the latest research findings of earthquake hazard analysis.And the maximum of seismic influence coefficient is given for practical use.Finally,a Typical example is given for explanation.  提出评估基准期的概念,推导出烈度的超越概率与重现期、年平均发生率三者间的关系。按照等超越概率原则确定不同后续服役期内小震、中震和大震的重现期。借鉴地震危险性分析的最新研究成果,给出基本烈度的计算方法及其与多遇烈度和罕遇烈度的换算关系,并落实到地震影响系数最大值以便实用。最后结合具有代表性的算例进行了说明。  
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