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首页> 外文期刊>Journal of Earthquake Engineering >EVALUATION OF CAPACITY SPECTRUM METHOD FOR ESTIMATING THE PEAK INELASTIC RESPONSES
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EVALUATION OF CAPACITY SPECTRUM METHOD FOR ESTIMATING THE PEAK INELASTIC RESPONSES

机译：估计峰值弹性响应的能力谱方法的评估

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摘要

The accuracy of the capacity spectrum method (CSM) depends on the precise estimation of equivalent period and damping ratio as well as the modification of the demand spectrum. In this paper, the CSM provided in ATC-40 for estimating the peak inelastic responses is evaluated. First, the effect of equivalent period and damping ratio estimation on the accuracy of the CSM is assessed. Analyses results indicate that the difference between estimation methods is large when the structural nonlinearity is large, but becomes negligible as the hardening ratio increases. Next, the reduction factors provided in ATC-40 and Eurocode are evaluated. It is found that the acceleration responses obtained using the factor of Eurocode is closer to the actual ones than those obtained using the factors of ATC-40. Finally, the demand spectrum is constructed using the peak absolute acceleration and pseudo-acceleration. The results obtained using the peak absolute acceleration is found to be generally larger than those obtained using the pseudo-ones. Since the original CSM generally underestimates the response, the use of peak absolute acceleration in the construction of demand spectrum produces the response relatively closer to the exact one. However, the use of peak absolute acceleration overestimates the response more when the original CSM overestimates the response.
机译：容量谱方法（CSM）的准确性取决于对等效周期和阻尼比的精确估算以及对需求谱的修改。在本文中，评估了ATC-40中提供的CSM，用于估计峰值非弹性响应。首先，评估等效周期和阻尼比估计对CSM精度的影响。分析结果表明，当结构非线性较大时，估计方法之间的差异较大，但随着硬化率的增加，估计方法之间的差异可忽略不计。接下来，评估ATC-40和Eurocode中提供的减少因子。结果发现，与使用ATC-40因子获得的加速度响应相比，使用Eurocode因子获得的加速度响应更接近实际响应。最后，使用峰值绝对加速度和伪加速度来构造需求频谱。发现使用峰值绝对加速度获得的结果通常大于使用伪一阶获得的结果。由于原始的CSM通常会低估响应，因此在需求频谱的构造中使用峰值绝对加速度会相对较精确地响应。但是，当原始CSM高估响应时，使用峰值绝对加速度会高估响应。

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