臺灣現行建築物耐震設計規範第三章動力分析方法中，提供不同結構系統所需的設計反應譜，係採用阻尼修正係數B值轉換5%的彈性反應譜至其他阻尼比的設計反應譜，針對短週期平台段與一秒週期的阻尼修正係數B值分別為BS和B1。規範要求中，短週期平台段與一秒週期的阻尼修正係數對應單一阻尼即為一個定值，只建議在設計地震使用，並無對於最大考量地震等級有提供建議值。但在過去觀察到的地震紀錄與前人研究可得知，阻尼修正係數應是一個與週期相關的函數，尤其在長週期處。此外，近期國外的研究也指出阻尼修正係數與地震動相關的影響參數有著一定的關聯性，是與評估地震發生時的地震動大小之地震動評估模型相近，例如震矩規模、距斷層面最短距離以及工址地表面下30公尺內之土層平均剪力波速等均為影響因子。因此，本研究的目的，係利用臺灣豐富的地震資料庫，發展適用於臺灣的阻尼修正係數(Damping Modification Factors, DMF)經驗模型，探討之對象包括譜位移、譜速度及譜加速度，以提供不同結構系統在設計時，對不同阻尼比地震動反應譜之需求。本研究所發展的經驗模型，主要為阻尼比與週期之函數，並考量規模、距離、地震延時及Vs30影響因子，過程中針對19個週期及11個阻尼比進行非線性迴歸，獲得三種地震動類別的阻尼修正係數模型。最終將所發展的經驗模型與現行規範進行比較分析，嘗試探討規範所設定之阻尼修正係數對應不同地震等級之適用性。
除此外，1999年集集地震的發生提供了大量的近斷層紀錄，也明確指出近斷層紀錄具有明顯的長週期脈衝效應。本研究除針對全部地震動紀錄在不同阻尼比的轉換上提供阻尼修正係數模型外，也針對近斷層地震動特性進行討論，藉以討論近斷層工址對於不同阻尼比設計地震反應譜之需求。本研究成果說明，僅考慮近斷層紀錄之阻尼修正係數對應於採取不分類別的地震紀錄分析的結果相近，故建議採用涵蓋近斷層紀錄的資料庫所發展之阻尼修正係數經驗模型，可應用至近斷層工址。換言之，本研究所發展的阻尼修正係數經驗模型可同時應用於一般區域與近斷層區域的工址轉換不同阻尼比反應譜之用。
最後，雖規範所建議之阻尼修正係數在不同阻尼比上有相對應的值，其餘阻尼比則以進行線性內插求得BS與B1。將本研究所發展的經驗模型代入控制震源(規模7.0，距離10公里)之評估結果與現行規範進行比較，結果呈現規範的建議與本研究在2%到25%阻尼比的修正係數BS與B1結果是相近的。唯在小於2%阻尼比的修正係數，規範均採用2%阻尼比值，比照本研究所發展之經驗模型的評估結果是相對保守的。

In the third chapter of the current Taiwan seismic design code for buildings, damping modification factors (i.e., B values) are provided as a denominator to calculate the elastic design basis response spectra with damping ratios other than 5%. At short periods and at one-second period, the B values are referred to as Bs and B1, respectively. Those values are originally proposed to derive the corresponding design basis response spectra rather than maximum considered ones. According to some observed earthquake records and past relevant studies, it is found that damping modification factors are greatly related to natural periods, at long periods in particular. In addition, some recent studies indicate that damping modification factors, to some extent, are relevant to some ground motion characteristics that are used in ground motion prediction equations, e.g., moment magnitude (MW), rupture distance (Rrup), averaged shear wave velocity in the upper 30 m of sites (Vs30), etc. Therefore, by means of abundant ground motion database recorded in Taiwan, this study aims to develop empirical and localized models for estimating suitable damping modification factors in terms of spectral displacement, velocity, and acceleration. The models are proposed in the form of not only damping ratios and natural periods but also MW, Rrup, duration, and Vs30. The corresponding to-be-determined coefficients are obtained through performing nonlinear regression at 19 natural periods and 11 damping ratios. Through comparing the damping modification factors obtained from the proposed models with those specified in the current design code, the applicability of the code-specified values is further examined. Moreover, the results obtained from the models determined using the entire ground motion database can satisfactorily reproduce the response spectra of several near-fault pulse-like ground motions with damping ratios different from 5%. It is further implied that the proposed model is robust sufficiently and valid for both far-field and near-fault pulse-like ground motions. With respect to a specific controlling earthquake (MW =7 and Rrup = 10 km), the response spectra with damping ratios varying from 0.5% to 30% obtained from the current design code and the proposed models are mutually compared. The results show that the damping modification factors provided in the current design code are acceptable practically when the damping ratio falls within 2% to 25%, while those may be too conservative when the damping ratio is smaller than 2%.

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