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題 名 | 鋼管鷹架之承載力及頻率量測研究=A Study on the Capacity and Frequency Measurement of Steel Scaffolds |
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作 者 | 呂良正; 高健章; 楊永斌; 黃偉熙; 黃木源; 鄒慶暉; 吳世雄; 林楨中; | 書刊名 | 勞工安全衛生研究季刊 |
卷 期 | 5:2 1997.06[民86.06] |
頁 次 | 頁1-13 |
分類號 | 441.53 |
關鍵詞 | 鷹架; 模板; 倒塌; 自然頻率; Scaffold; Formwork; Collapse; Natural frequency; |
語 文 | 中文(Chinese) |
中文摘要 | 模板工程之倒塌通常會造成嚴重的生命財產損失,因此有必要對此臨時性支撐系 統之結構特性加以探討。本文將針對國內常使用的簡易式型鋼管鷹架,分別探討其承載力和 加載時頻率變化特性。於鷹架承載力方面,探討鷹架在多架間組搭形式下,其承載能力與一 架間單元組之關係;以及受非均力載重情形下,鷹架承載力的變化情形。試驗結果發現:1. 無論鷹架承載能力皆相近。因此,造成該區域的鷹架先行挫屈,進而導致整體鷹架支撐能力 下降。 2. 多架間鷹架的交叉拉捍僅能提高面外方向之勁度,對於面內方向之勁度幫助不大 。 3. 我們可以用 " 組單元 " 的概念來估算多架間鷹架的最大承載能力。鋼管架加載時, 理論上其本身自然頻率將會變小,本文利用全尺寸鷹架組合單元試驗,來採討其水平振動頻 率變化情形,以及是否可作為支撐系統倒塌之監測指標。試驗結果發現,頻率變化末如理論 分析般的明顯,因此目前在工地實用上仍有困難。然而全尺鷹架試驗所得之承載力,仍可作 為設計之用。 |
英文摘要 | The Collapse of Formwork Often Causes Losses of Life and Property. Hen ce there is a Need to Understand the Behavior of Such Temporary Supporting Frames. This Study is Mainly Concerned with the Capacity and Frequency Characteristics of Simple Steel Scaffolds, Which are Widely used in Taiwan. Both Uniform and Nonuniform Load patterns are Considered. As for Loading Capacity, the Relation between the Capacity of Multi-Bay Scaffolds and That of a Unit Set of Single-Bay Scaffolds is Investigated. the Following Observatins Can be Drawn from the Experimental Work. Firstly, Whether the Loading is Uniform or not, the Capacity of the Most critical of the Most Critical Unit Set is Almost Constant for Scaffolds of the Same Story. Also, Collapse Usually Initiates from Buckling of this Contribute Very Little to the In-Plane Stiffness. Thirdly, the Concept of Unit Set Can be used to Estimate the Capacity of Multi-Bay Scaffold during the Application of Loading are Measured. Theoretically, the Frequencies Will Decrease as the Loading is Increased Because of the Degradation of Their stiffnesses. Full Scale Tests are Carried Out to Study the Changes in Frequency which Can be Adopted as a precaution Indicator for Avoiding Scaffold Collapse. I t is Found That the Changes in Frequency as a precaution Indicator is Infeasible at This Moment. However, the Loading Capacities Obtained from the Full Scale Tests Can Still be used in Designing Steel Scaffold Systems. |
本系統中英文摘要資訊取自各篇刊載內容。