FEMA273及274，FEMA356及ASCE/SEI41-06等第一代耐震性能評估皆是以結構受震後之反應做為評定結構性能指標之依據，但此評估法之缺點包含：(1)少部分構件的破壞決定了整體結構之耐震性能；(2)忽略非結構元件及設備之損失；(3)使用特定的地震強度大小來分析結構反應，忽略地震強度、材料性質、結構反應及損壞情形等隨機性。基於此，美國ATC-58於2011年年底提出新一代房屋結構耐震性能準則之草案，以結構修繕金額、修復時間或死亡人數為性能指標，以協助工程師與業主、房屋使用者進行較有效的溝通。ATC-58的評估方法涉及非線性動力分析，本研究考量新一代房屋結構耐震性能評估方法之需要，以特殊抗彎矩構架與偏心斜撐構架為例，透過非線性動力分析，探討Geometric-Mean Scaling、Modal-Pushover-Based Scaling、Distribution Scaling三種縮放地表加速度歷時震幅之方法，對層間位移、最大樓層加速度及平均樓層加速度反應譜等結構反應分佈的影響。

The ATC-58 project in the United States is developing new procedures for building-specific seismic performance (loss) assessment. The new procedures will characterize performance in terms of direct economic loss, indirect economic loss and casualties rather than by building component deformations and accelerations. Uncertainty and randomness will be captured in every step of the performance assessment process. A key issue in the new procedures, which involve the use of nonlinear response-history analysis, is the scaling of ground motions. The scaling procedures should preserve the distribution (e.g., both median and dispersion) in the earthquake shaking for the site of interest so that one can properly capture the distribution of structural responses and demand on secondary systems. A series of nonlinear response-history analyses are performed in this study using a sample special moment resisting frame and a sample eccentrically braced frame and three ground-motion scaling procedures, including Geometric-Mean, Modal-Pushover-Based, and Distribution Scaling procedures. The impact of the three scaling procedures on the distributions of structural responses is discussed.

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