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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.8: Seismic Engineering; 20050717-21; Denver,CO(US) >SEISMIC PROVING TEST OF ULTIMATE PIPING STRENGTH (SAFETY MARGIN OF SEISMIC DESIGN CODE FOR PIPING)
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SEISMIC PROVING TEST OF ULTIMATE PIPING STRENGTH (SAFETY MARGIN OF SEISMIC DESIGN CODE FOR PIPING)

机译：最高抗压强度的抗震试验（抗震设计规范的安全限度）

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摘要

The proving test of a large-scale piping system and elasto-plastic analyses were conducted to assure safety margins of current and newly proposed seismic design codes for piping in Japanese nuclear power plants. Two test models were used, one for the design method confirmation test and one for the ultimate strength test. The allowable acceleration safety margin (M_A) was defined as the ratio of A_f/A_(S2), where Af is the maximum input acceleration corresponding to piping failure in a single seismic input, and A_(S2) is the maximum allowable input acceleration for the S_2 seismic wave according to Japanese seismic design codes for Class 1 piping components. When the current code was applied to the design method confirmation test model, associated with the 10% broadened response spectrum of the S_2 seismic wave for a PWR building, M_A was revealed to be 9.6 for a frequency ratio (R_w) of 0.7. Without the response spectrum broadening, M_A decreases to 4.9. Redefined as the ratio in terms of the displacement and cyclic peak stress of the highest stressed component, the safety margins (M_D, M_(FC)) tend to change to 7.7 and 3.7, respectively. The newly proposed code includes the following modifications from the current code rules: 1) only the allowable stress limits to prevent fatigue failure is ruled for the "S_2" seismic wave, 2) a new diagram of the K_e factor in the fatigue design analysis is implemented. The safety margin M_A of the proposed code with the broadened spectrum was revealed to be still as high as 6.6 for R_w =0.7. Analytical evaluation was conducted to discuss the tendency of the safety margins for seismic input conditions that differ from R_w =0.7, and the degree of conservatism or margin included in design analysis methods, whose degree is related to the safety margins.
机译：进行了大型管道系统的验证测试和弹塑性分析，以确保当前和新提议的日本核电站管道抗震设计规范的安全裕度。使用了两种测试模型，一种用于设计方法确认测试，一种用于极限强度测试。允许加速度安全裕度（M_A）定义为A_f / A_（S2）的比率，其中Af是与单个地震输入中的管道故障相对应的最大输入加速度，而A_（S2）是以下条件下的最大允许输入加速度：根据日本地震设计规范针对1级管道组件的S_2地震波。当将当前代码应用到设计方法确认测试模型时，与压水堆建筑物的S_2地震波的响应频谱扩展10％时，对于频率比（R_w）为0.7，M_A显示为9.6。如果不扩展响应频谱，则M_A降至4.9。重新定义为最高位移分量的位移和循环峰值应力之比后，安全裕度（M_D，M_（FC））往往分别变为7.7和3.7。新提议的代码包括对当前代码规则的以下修改：1）对于“ S_2”地震波，仅规定了防止疲劳破坏的允许应力极限； 2）在疲劳设计分析中新的K_e因子图为已实施。对于R_w = 0.7，建议的代码的频谱扩展后的安全裕度M_A仍然高达6.6。进行了分析评估，以讨论不同于R_w = 0.7的地震输入条件下安全裕度的趋势，以及设计分析方法中包含的保守度或裕度的程度，其程度与安全裕度有关。

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