【摘要】 核电厂和一些重要的工程结构遭遇地震时,采用合理的地震动阈值作为报警和关停的,可以有效减少工程结构破坏引起的风险。研究介绍了累积绝对速度(CAV)等相关变体参数的定义及其来源背景,论述了相关参数在地震工程研究中的应用。选取集集地震和汶川地震的地震动和烈度数据,探讨了CAV与结构破坏之间的关系,分析了峰值地震动加速度(PGA)和标准累积绝对速度(CAV STD)与烈度的相关性,以及表征结构初始破坏阈值的合理性。结果表明CAV STD和PGA均与烈度有正相关性,不同的地震,同一烈度对应的平均PGA和平均CAV STD有较大差异,而且烈度7度区的PGA和CAV STD作为判别结构初始破坏的阈值的可靠性较强。更多还原

【Abstract】 A reasonable ground motion parameter and threshold value for shutdown or alarm of nuclear power plant and other important structures may reduce the risk for a potential disaster.We review the cumulative absolute velocity(CAV) related parameters as well as the application of CAV in earthquake engineering.To identify the correlation between seismic intensity,CAV and peak ground acceleration(PGA),and to identify the thresholds’ capability of PGA and CAV,we also analyze the relation between strong ground motions parameters and seismic intensity of Wenchuan and Chi-chi earthquake.Results indicate:CAV and PGA value are proportional to the seismic intensity,but for different earthquake magnitudes,the average value of a station is different.PGA and CAV STD of threshold intensity Ⅶ are reliable as parameters to identify the initial damage to a structure.更多还原