由RC構架受反覆荷載試驗結果探討RC梁耐震設計參數之研究

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莊嬿齡(Yan-Ling Zhuang) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

由RC構架受反覆荷載試驗結果探討RC梁耐震設計參數之研究

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至系統瀏覽論文 (2026-8-1以後開放)

摘要(中)

國內目前積極發展高強度鋼筋混凝土，但國內現行規範缺少針對高強度鋼筋混凝土之設計建議值，故利用數據分析統計得知高強度與普通強度鋼筋混凝土之耐震設計參數差異，是本研究主軸。此外，國內目前對於地震發展大小不同之地區，均採用相同超額強度設計值，缺少針對不同震度與設計值關係。故對於各震度之層間位移比與耐震超額強度因子關係之調查，亦是本研究探討課題之一。
本研究收集、整理及統計歷年來之 RC 梁受反覆載重下之相關數據進行分析與探討，並由梁主筋SD420、SD490與SD690分別代表普通強度與高強度鋼筋混凝土之RC梁。利用Paulay (1992)方式求取RC梁之有效勁度；再者，利用學者 Brooke (2011)統計方法，歸納鋼筋之材料超額強度因子與應變硬化超額強度因子，並探討應變硬化超額強度因子與各震度層間位移比之關係，同時比較普通與高強度RC梁之差異。
研究結果顯示，RC梁構件降伏時之有效慣性矩I_e隨混凝土抗壓強度之增加降低、隨構件之跨深比之增加而增加，且多數規範之建議值有偏高趨勢。而鋼筋應變硬化超額強度因子統計結果顯示，不同鋼筋級數之值無明顯差異，即其值大小與鋼種無關，但在層間變位角於1.5~4%間時，其隨層間位移比之增加有線性增加的趨勢，且ACI 318-19之建議值略低。

摘要(英)

Taiwan uses the same seismic design values for areas with different earthquake intensity. In addition, Taiwan develops high-strength reinforced concrete in recent years, but the code does not have design values for high-strength. Therefore, the objective of the study is to investigate the difference between the seismic design values of high strength and normal strength RC beams, and to discuss their relationship with drift ratio.
This plan collects, organizes and analyzes the data tested from RC beams subjected to cyclic loading. Those beams having the longitudinal reinforcement of SD420, SD490 and SD690 represent as normal strength and high strength RC beams, respectively. The effective initial stiffness (K_{eff}) of the RC beam is obtained by adopting Paulay’s (1992) method. Meanwhile, the study adopted the Brooke’s (2011) method to calculate alpha_{mat} and alpha_{har} of the steel bar. The purpose of adopting Brooke’s method is to find the relationship between drift ratio and alpha_{har}, and their difference between normal strength and high-strength RC beams.
The results show that the effective moment of inertia (I_e) of the RC beam decreases with the increase of concrete compressive strength and increases with the increase of span-to-depth ratio, and the recommended value in some codes overestimates the actual value. The statistical results show that there is no significant difference in the value of the overstrength factor of strain hardening, that is, the value of alpha_{har} is independent of the steel grade, but it has a linear increasing with the increase of the drift ratio. Moreover, the recommended value of alpha_o in ACI 318-19 is too low.

關鍵字(中)

★ 鋼筋混凝土梁
★ 耐震設計
★ 超額強度因子
★ 有效勁度
★ 層間變位角

關鍵字(英)

★ RC beam
★ seismic design
★ overstrength factor
★ effective stiffness
★ drift ratio

論文目次

摘要 i
Abstract iii
誌謝 v
目錄 vi
表目錄 ix
圖目錄 xi
符號說明 xvi
第一章、諸論 1
1.1 研究動機 1
1.2 研究目的與方法 2
第二章、文獻回顧 3
2.1 材料性質 3
2.1.1 鋼筋之機械性質 3
2.1.2 混凝土材料性質 4
2.2 梁斷面撓曲強度分析 9
2.2.1 矩形梁 9
2.2.2 T型梁 10
2.3 塑鉸區超額彎矩與超額強度因子 11
2.3.1 影響超額強度之因素 17
2.3.2 超額強度之應用 19
2.4 有效勁度 20
2.4.1 現行規範對有效勁度之規定 22
2.4.2 影響有效勁度之因素 24
2.5 梁柱接頭變位組成 26
第三章、研究方法 27
3.1 資料庫建置 27
3.2 試體設置類型 28
3.3 數據前處理 28
3.4 超額強度因子之調查 29
3.4.1 材料超額強度因子 29
3.4.2 應變硬化超額強度因子 30
3.5 有效慣性矩之調查 31
3.6 資料分析之方式 33
第四章、統計結果 36
4.1 混凝土彈性模數預測 37
4.2 有效慣性矩統計結果 37
4.3 材料超額強度因子統計結果 41
4.4 應變硬化超額強度因子統計結果 42
第五章、討論 45
5.1 有效慣性矩探討 45
5.2 材料超額強度因子探討 54
5.3 應變硬化超額強度因子探討 54
5.4 超額強度因子探討 58
第六章、結論與建議 61
6.1 結論 61
6.2 建議 62
參考文獻 64
附錄A 梁塑性彎矩計算與剪力需求設計例[47] 141
附錄B 試體實際標稱強度計算 144
附錄C 統計結果詳細數據 147
附錄D 資料庫文獻 211

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指導教授

王勇智(Yung-Chih Wang)

審核日期

2021-8-3

推文