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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 廖文正 | |
dc.contributor.author | Wei-Sheng Lin | en |
dc.contributor.author | 林偉聖 | zh_TW |
dc.date.accessioned | 2021-06-17T08:19:10Z | - |
dc.date.available | 2020-08-20 | |
dc.date.copyright | 2019-08-20 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-08-13 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74080 | - |
dc.description.abstract | 隨著鋼管混凝土結構的應用越趨廣泛,各國對於鋼管混凝土相關研究也愈來愈多,尤其在對於鋼管混凝土結構耐震行為方面。然而對於鋼管混凝土之潛變行為研究則較為有限,在台灣對於鋼管混凝土結構之潛變相關研究則是更為稀少。
在現今長期對混凝土之研究與改良下,高強度、高性能之混凝土的使用日益頻繁,而在鋼管混凝土結構中,亦有將高強度自充填混凝土搭配進行使用的前例。而在鋼管混凝土結構中,混凝土未與空氣接觸,因此主要的收縮變形為自體收縮,為了減少因低水膠比及高漿體量而產生較多的自體收縮等問題,常會在混凝土配比中添加膨脹劑或其他摻料來達到目的,然而對於鋼管混凝土在添加膨脹劑後受軸壓之長期行為與混凝土本身在添加膨脹劑對於潛變與收縮之影響為何亦須要透過更多之實驗與研究來發現。 本研究以台北南山廣場之鋼管混凝土結構柱內灌漿配比進行潛變與收縮實驗,該配比為高強度且高性能自充填混凝土,配比中亦含有約3%之膨脹劑,藉由長期之軸壓實驗觀察鋼管混凝土與自充填混凝土之潛變與收縮行為,同時,因為混凝土產生潛變與收縮使得鋼管混凝土斷面應力重新分配,對於鋼管混凝土中應力轉移的現象進行分析,最後將潛變與收縮實驗的結果與本土化預測模型與其原始模型進行交叉比較與討論。 從實驗結果顯示,鋼管混凝土在有鋼管圍束的情況下使得內部混凝土在整體複合斷面強度提升下,對於混凝土潛變量的影響相較於無鋼管試體是較低的。鋼管混凝土在內部混凝土發生潛變與收縮的情況下使得鋼管所受的應力增加,在實驗齡期100天即增加了初始應力的30.8%。由於預測模型中皆未考慮膨脹劑的添加,因此預測模型相較於實驗結果的收縮量皆高出較多,顯示出膨脹劑的添加確實對於收縮量有產生減少的作用。而在預測模型對於實驗結果的比較中,潛變柔度函數的預測以Model B4-TW較為準確,相較於Model B4做了粒料強度之修正;且相較於資料庫量較少之Model B4-TW(SCC),Model B4-TW的預測值則更有可信度。 | zh_TW |
dc.description.abstract | With the increasing application of concrete-filled steel tube (CFT) structures, there are more and more researches on performance of CFT structures, particularly in seismic behavior. However, the research on creep behavior of CFT is limited, and it is even rarer in Taiwan.
As more and more improvement in concrete mix design, the uses of high strength and high performance concrete are increasing nowadays, and there are some precedent cases for the uses of high strength self-consolidating concrete in the CFT structures. In order to reduce the autogenous shrinkage caused by low water-to-cementitious ratio and high volume of paste in CFT structures, the concrete mix design is often added the expansion agent or other additives. However, the long-term behavior of CFT structures which are added expansion agent need to be discovered through more relative experiments and research. In this research, the creep and shrinkage experiments were carried out with the mix design of CFT columns in the Taipei Nan Shan Plaza, which is high strength and high performance self-consolidating concrete with 3% of expansion agent. The variables of creep experiments are the presence or absence of the lateral restraint and different loading ages; and the variables of shrinkage experiments are different curing ages and different curing condition. Then, owing to the occurrence of creep and shrinkage of internal concrete of CFT specimens, the phenomenon of stress transfer in CFT specimens could be analyzed. Finally, the experiment results were compared and discussed with the localized prediction models, Model B4-TW and Model B4-TW (SCC), and with its original model, Model B4. The experimental results show that the creep strain of internal concrete of CFT specimens which are under the lateral restraint of steel tubes is lower than that of the specimens without tubes. When the occurrence of creep in CFT specimen, the internal stress state in CFT specimen would change and made the stress of steel become larger. In this research, the results show that the stress in steel had grown 30.8% compared to initial stress in 100 days due to the creep in CFT specimen. Since the addition of the expansion agent is not considered in the prediction models, the shrinkage strain of prediction models is much higher than that of the experimental results, indicating that the addition of the expansion agent does reduce the amount of shrinkage strain. Last, in the comparison of the prediction models to the experimental results, the creep strain predicted by Model B4-TW is more accurate than the other two models, which means Model B4-TW is more credible in this research. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T08:19:10Z (GMT). No. of bitstreams: 1 ntu-108-R06521237-1.pdf: 7001443 bytes, checksum: 3970d514fc02fcfc29dcfbcc9a798a01 (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | 誌謝 I
摘要 III ABSTRACT V 目錄 VII 表目錄 XI 圖目錄 XIII 照片目錄 XIX 符號總表 XX 第一章、緒論 1 1.1 研究動機與目的 1 1.2 研究內容 2 1.3 研究流程圖 3 第二章、文獻回顧 4 2.1 混凝土材料之長期變形 4 2.1.1 混凝土之潛變 4 2.1.2 混凝土之收縮 12 2.2 自充填混凝土 21 2.2.1 自充填混凝土之應用 22 2.2.2 自充填混凝土之潛變 23 2.2.3 自充填混凝土之收縮 25 2.3 鋼管混凝土 26 2.3.1 鋼管混凝土之應用 26 2.3.2 鋼管混凝土之潛變 27 2.3.3 鋼管混凝土之收縮 33 2.3.4 鋼管混凝土受軸壓下之圍束效應 35 2.3.5 鋼管混凝土受軸壓下之應力轉移 40 2.4 應變計量測之溫度偏移現象 42 2.4.1 電阻式應變計 42 2.4.2 振弦式應變計 43 2.4.3 溫度偏移現象 44 第三章、國內外混凝土材料潛變收縮預測模型 45 3.1 ACI 209R(美國) 45 3.1.1 潛變公式 45 3.1.2 收縮公式 47 3.2 GL2000 (加拿大) 48 3.2.1 潛變公式 48 3.2.2 收縮公式 50 3.3 CEB MC10 (歐洲) 51 3.3.1 潛變公式 51 3.3.2 收縮公式 53 3.4 Model B4 (美國) 55 3.4.1 時間對溫度之修正 55 3.4.2 潛變公式 57 3.4.3 收縮公式 60 3.5 Model B4-TW(台灣) 65 3.5.1 Model B4-TW 66 3.5.2 Model B4-TW (SCC) 73 3.6 預測模型選用 80 第四章、實驗計畫 81 4.1 實驗背景 81 4.2 實驗流程圖 82 4.3 實驗材料與配比 83 4.3.1 實驗材料 83 4.3.2 實驗配比 84 4.4 試體設計 84 4.4.1 試體參數與名稱 85 4.4.2 試體細部設計 88 4.5 實驗方法與設備 93 4.5.1 混凝土圓柱抗壓實驗 93 4.5.2 初終凝實驗 94 4.5.3 潛變實驗 96 4.5.4 收縮與長度變化實驗 103 第五章、初步實驗結果與討論 106 5.1 材料實驗 106 5.1.1 自充填混凝土流動性質結果 106 5.1.2 混凝土圓柱抗壓實驗 106 5.1.3 初終凝實驗 108 5.1.4 溫度偏移現象 109 5.2 潛變實驗 111 5.2.1 潛變實驗加載應力比 111 5.2.2 有無鋼管試體之長期變形差異 115 5.2.3 鋼管混凝土中鋼管與混凝土長期變形差異 116 5.2.4 不同加載齡期之長期變形差異 118 5.3 收縮實驗 121 5.3.1 不同養護時間之長期變形差異 121 5.3.2 不同養護環境之長期變形差異 123 5.4 鋼管混凝土之應力轉移情形 125 5.5 國內外混凝土材料預測模型之結果與比較 129 5.5.1 B4 131 5.5.2 B4-TW 137 5.5.3 B4-TW(SCC) 143 5.5.4 各預測模型之比較 147 第六章、結論與建議 153 6.1 結論 153 6.2 建議 155 參考文獻 156 | |
dc.language.iso | zh-TW | |
dc.title | 鋼管混凝土潛變行為之實驗研究 | zh_TW |
dc.title | Experimental Study on Creep Behavior of Concrete-Filled Steel Tube | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 陳振川,吳子良,謝紹松 | |
dc.subject.keyword | 潛變,收縮,鋼管混凝土,自充填混凝土,膨脹劑,應力轉移, | zh_TW |
dc.subject.keyword | creep,shrinkage,concrete-filled steel tube,self-consolidating concrete,expansion agent,stress transfer, | en |
dc.relation.page | 164 | |
dc.identifier.doi | 10.6342/NTU201903574 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2019-08-14 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 土木工程學研究所 | zh_TW |
顯示於系所單位: | 土木工程學系 |
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