Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/15903
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dc.contributor顏聰zh_TW
dc.contributorTsong Yenen_US
dc.contributor潘煌zh_TW
dc.contributor湯兆緯zh_TW
dc.contributorHuang-Hsing Panen_US
dc.contributorChao-Wei Tangen_US
dc.contributor.advisor陳豪吉zh_TW
dc.contributor.advisorHow-Ji Chenen_US
dc.contributor.author李政軒zh_TW
dc.contributor.authorLi, Jheng-Syuanen_US
dc.contributor.other中興大學zh_TW
dc.date2009zh_TW
dc.date.accessioned2014-06-06T06:54:42Z-
dc.date.available2014-06-06T06:54:42Z-
dc.identifierU0005-3007200811342300zh_TW
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dc.identifier.urihttp://hdl.handle.net/11455/15903-
dc.description.abstract本文以一系列之試驗結果探討輕質混凝土預力樑之結構行為與時間性變形行為,並與常重預力混凝土樑之行為相比較。研究內容主要分為三大部分:第一部分為混凝土硬固性質和工程性質試驗。第二部分為澆置4.2 m的輕質預力混凝土樑與常重預力混凝土樑經由養護齡期不同,探討其撓曲、勁度與延展性等表現。第三部分為澆置20.5 m的輕質預力混凝土樑與常重預力混凝土樑,觀察其時間性變形,探討樑之軸向變形、預力損失發展行為、上拱量變化等。 由預力混凝土樑試驗結果得知,預力樑試體在經過一年的戶外養護後,混凝土樑之極限彎矩強度與28天者差異並不大,就延展性與養護時間而言,常重預力混凝土樑之構件延展性指數約為28天者之1.38倍,輕質預力混凝土樑之構件延展性指數約為28天者之1.33倍。試驗結果顯示在相同設計強度條件下無論輕質預力混凝土樑或是常重預力混凝土之延展性皆會較齡期28天者好,輕質預力混凝土樑之構件延展性指數及斷面延展性指數普遍較常重預力混凝土樑小。 由觀察時間性變形結果得知,在施拉預力後180天,輕質預力混凝土樑預力損失約為14.1%,常重者約為16.8%,輕質預力混凝土樑較常重者預力損失較小。此現象亦可由輕質預力樑之上拱量及軸向變形量試驗中,輕質混凝土上拱量及軸向變形量較小之結果相印證。以上研究結果顯示,輕質混凝土在配比中添加卜作嵐材料、使用預濕輕質骨材和良好的養護環境,對混凝土之乾縮與潛變有正面助益。zh_TW
dc.description.abstractIn this research, a series of experiments are planed to investigate the structural behavior and time-dependent derformation behavior of prestressed lightweight concrete beams for the purpose of application and compare with that of prestressed normal concrete beams. The experimental project were divided into three parts: Part I, the hardened properties and engineering properties of concrete were tested. Part II, the flexure behavior, stiffness and ductility tests of 4.2 m prestressed concrete beams were executed. Part III, time-dependent derformation behavior of 20.5 m prestressed concrete beams were observed. Drawn form the results of beam tests, it could be noticed that there are no marked differences between prestressed concrete beams specimen with curing outdoors for one year and that with curing outdoors for 28 days in flexural strength and ductility. In view of ductility, the member displacement ductility factor of prestressed normal concrete beams for the age of one year is about 138% of that for the age of 28 days. And the member displacement ductility factor of prestressed lightweight concrete beams for age of one year is about 133% of that for the age of 28 days. Whether prestressed lightweight concrete beams or prestressed normal concrete beams, the member displacement ductility factor of one year is better than that of 28 days. For the same design strength level, it shows that the ductility of prestressed normal concrete beams are better than that of prestressed lightweight concrete beams. As regards the results of the observation of time-dependent derformation of prestressed concrete beams, for 180 days after prestressing, the prestress loss is about 14.1% for prestressed lightweight concrete beam and about 16.8% for prestressed normal concrete beams. It reveals that, by means of proportioning the suitable lightweight concrete mixture to improve the volume stability, an outstanding benefit could be achieved for controlling the prestress loss of prestressed lightweight concrete beams.en_US
dc.description.tableofcontents謝 誌 I 摘 要 II Abstract III 目 錄 IV 表 目 錄 VI 圖 目 錄 VII 照 片 目 錄 IX 第一章 緒論 1 1.1 前言 1 1.2 研究目的與範圍 2 第二章 文獻回顧 4 2.1 輕質骨材混凝土概述 4 2.1.1 輕質骨材混凝土定義 4 2.1.2 輕質骨材之種類與特性 4 2.2 輕質骨材混凝土之性質與優點 5 2.2.1 輕質骨材混凝土之性質 5 2.3 輕質骨材預力混凝土 12 第三章 試驗規劃 19 3.1 混凝土硬固性質與工程性質試驗 19 3.1.1 混凝土配比與試驗材料 19 3.1.2 試體規劃表 20 3.1.3 試驗項目與方法 20 3.2 預力樑結構行為與時間性變形試驗 21 3.2.1 4.2 m預力樑 21 3.2.2 20.5 m預力樑試驗 23 第四章 混凝土試驗結果分析與討論 40 4.1 輕質骨材基本性質 40 4.2 輕質混凝土與常重混凝土之硬固與工程性質 40 4.2.1 抗壓強度 40 4.2.2 彈性模數 40 4.3 混凝土之乾縮 41 4.3.1 絕乾輕質骨材對乾縮之影響 41 4.3.2 環境因素對輕質混凝土與常重混凝土乾縮之影響 42 4.4 潛變 43 4.5 ACI 209 預測值 43 第五章 預力樑試驗結果與討論 53 5.1 4.2 m預力樑試驗 53 5.1.1 樑之破壞行為 53 5.1.2 預力樑之撓曲強度 54 5.1.3 延展性 56 5.1.4 勁度 58 5.2 20.5 m預力樑變形試驗結果 58 5.2.1 瞬間變形試驗(預力施拉階段) 58 5.2.2 長期觀測試驗 59 第六章 結論與建議 75 6.1 結論 75 6.2 建議 77 參考文獻 78zh_TW
dc.language.isoen_USzh_TW
dc.publisher土木工程學系所zh_TW
dc.relation.urihttp://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-3007200811342300en_US
dc.subjectTime-dependent deformationen_US
dc.subject輕質預力混凝土樑zh_TW
dc.subject時間性變形zh_TW
dc.title輕質預力混凝土樑之時間性變形研究zh_TW
dc.titleTime-dependent deformation of Prestressed Lightweight Concrete Beamsen_US
dc.typeThesis and Dissertationzh_TW
item.languageiso639-1en_US-
item.openairetypeThesis and Dissertation-
item.cerifentitytypePublications-
item.grantfulltextnone-
item.fulltextno fulltext-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
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