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首頁> 外文學位 >Behavior at the corners of skewed, single-span, cast-in-place, post-tensioned box girder bridges.
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Behavior at the corners of skewed, single-span, cast-in-place, post-tensioned box girder bridges.

機譯：在傾斜，單跨，現澆，后張緊的箱梁橋的拐角處表現。

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摘要

In today's textbooks, analyzing prestressed members and bridges takes a two-dimensional approach. Two-dimensional analysis is the only way to analyze prestressed bridges and members because otherwise the hand calculations are extremely difficult. Skewed bridges, however, need to be analyzed and designed three-dimensionally. Based on engineering inspection, it is possible to tell how a non-skewed symmetric bridge will behave. However, the knowledge of how a skewed bridge will behave cannot be obtained by inspection only. Finite element analysis can be used to model a bridge and discover how the bridge will react to dead loads and post-tensioning forces.;When a bridge is built on a skew, the acute corners of the bridge support much less concrete weight than the obtuse corners of the bridge. If the post-tensioning force causes a decrease in load at the acute corners of the skewed bridge and if the skew of the bridge is great enough, there is a concern that there could be uplift at these acute corners of the bridge. Uplift at any corner of the bridge should not be allowed. The objective of this study is to investigate a simple span skewed box girder bridge to see if any uplift occurs at the acute corners of the bridge due to post-tensioning forces.;After careful study of a skewed simple span cast-in-place post-tensioned box girder bridge, it was found that the post-tensioning force actually transfers more downward force into the acute corners of the bridge. Based on this study, the post-tensioning force will not cause uplift in the acute corners of the skewed bridge.
機譯：在當今的教科書中，分析預應力構件和橋梁采用的是二維方法。二維分析是分析預應力橋梁和構件的唯一方法，因為否則手工計算將非常困難。但是，斜橋需要進行三維分析和設計。根據工程檢查，可以判斷非偏斜對稱橋的行為。但是，僅通過檢查無法獲得有關斜橋如何工作的知識。有限元分析可用于對橋梁進行建模，并發(fā)現橋梁將如何應對恒載和后張力。;當橋梁以偏斜形式建造時，橋梁的尖角支撐的混凝土重量比鈍角小得多橋的角落。如果后張力導致傾斜的橋梁的銳角處的載荷減小，并且如果橋梁的傾斜度足夠大，則擔心在橋梁的這些銳角處會出現隆起。不允許在橋梁的任何角落上揚。這項研究的目的是研究一個簡單的跨度斜交箱形箱梁橋，以查看由于后張力而在橋梁的銳角處是否出現隆起。;仔細研究了一種傾斜的，簡單跨度的現澆柱子張拉箱梁橋，發(fā)現后張拉力實際上將更多的向下力傳遞到橋的銳角。根據這項研究，后張力不會在斜橋的尖角處引起隆起。

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  • 作者

    Holthaus, Phillip M.;

  • 作者單位

    Southern Illinois University at Carbondale.;

  • 授予單位 Southern Illinois University at Carbondale.;
  • 學科 Engineering General.;Engineering Civil.;Transportation.
  • 學位 M.S.
  • 年度 2009
  • 頁碼 51 p.
  • 總頁數 51
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 工程基礎科學;建筑科學;綜合運輸;
  • 關鍵詞

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