鋼筋混凝土特殊抗彎矩構架非線性歷時分析及地震歷時挑選與縮放研究

Abstract

本研究旨在透過非線性歷時分析探討鋼筋混凝土特殊抗彎矩構架受震下的反應，並比較地震歷時挑選方法與縮放標準。首先透過Koichi Kajiwara et al. (2015)於E-Defense所進行的振動台試驗結果，驗證以ETABS數値模擬方法的可靠性。接著設計符合現行規範之三種樓層數5層、15層及25層之鋼筋混凝土案例建物，搭配國震中心開發之TEASPA與TEASDA輔助程式設定桿件塑鉸與遲滯模型，進行非線性歷時分析。輸入地震歷時包含實測歷時與人造歷時，分別以線性縮放與反應譜擬合方式調整歷時振幅。由分析結果討論層間位移角、樓層剪力及樓層加速度，受地震等級、建物規模、輸入歷時種類等因素之影響。以大量歷時分析結果作為基礎，透過隨機挑選與貪婪演算法選取地震組合，討論評估不同反應所需歷時筆數，以及實測歷時與人造歷時反應分佈的差異。最後針對台灣與美國規範對於輸入歷時振幅縮放要求進行初步討論。

This study aims to investigate the response of code-compliant reinforced-concrete special moment-resisting frames under seismic loading using nonlinear response-history analyses (NRHA), and to compare selection and scaling of ground-motions. The reliability of numerical simulations in ETABS is validated through shaking table tests results conducted by Koichi Kajiwara et al. (2015) at E-Defense. Subsequently, three reinforced concrete building cases of 5, 15, and 25 stories are designed in accordance with current codes. NRHA are conducted through TEASPA and TEASDA developed by the National Center for Research on Earthquake Engineering to define hinges and hysteretic models. Ground motions are modified by amplitude scaling and spectral matching. Through analysis results, we discuss inter-story drift ratios, story shears, and floor accelerations under the influence of factors such as seismic intensity, building scale, and type of ground motions. Based on a large quantity of NRHA results, ground-motion suites are selected using random sampling and greedy algorithms to evaluate the required number of ground motions for different response assessments. Finally, preliminary discussions are conducted regarding amplitude scaling requirements for ground motions in Taiwanese and American codes.