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題 名 | 鋼筋混凝土梁撓曲鋼筋的握裹破壞機率=The Probability of Bond Failure of Flexural Reinforcement of Reinforced Concrete Beams |
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作 者 | 呂文堯; | 書刊名 | 技術學刊 |
卷 期 | 15:3 2000.09[民89.09] |
頁 次 | 頁437-445 |
分類號 | 440.328 |
關鍵詞 | 握裹破壞機率; 蒙地卡羅法; 變異係數; 伸展長度; Probability of bond failure; Monte carlo technique; Coefficient of variation; Development length; |
語 文 | 中文(Chinese) |
中文摘要 | 本文旨在探討彎矩作用下,鋼筋混凝土梁底部撓曲拉力鋼筋的握裏破壞機率。考慮混凝土和鋼筋的強度、斷面的尺寸、混凝土之保護層厚度(鋼筋的間距)、握裏強度之理論模式及載重等皆為隨機變數。本文採用Orangun, Jirsa and Breen模型來計算理論握裏強度,以蒙地卡羅法求鋼筋混凝土梁的握裏破壞機率。由於握裏強度之變異系數太大,研究結果顯示,自最大彎矩斷面到鋼筋切斷點間,鋼筋的埋置長度若取為1.0至1.5倍的伸展長度,則握裏破壞機率值偏高,此時可藉增加橫向鋼筋量或撓曲鋼筋間距、混凝土保護層厚度將握裏破壞機率值限制在0.00135以下。實際上根據ACI規範設計,梁自最大彎矩斷面到鋼筋切斷點間,鋼筋的埋置長度通常在1.7倍的伸展長度以上,此時梁若能配置足夠的橫向鋼筋量,則握裏破壞機率值甚至可低於撓曲破壞機率值。 |
英文摘要 | The purpose of this paper is to investigate the probability of bond failure of bottom-tension reinforcement of reinforced concrete beams subjected to bending moment. The theoretical bond strength is calculated based on the OJB model, and the probability of bond failure is determined by the Monte Carlo technique in this paper. The strength of concrete and steel, the cross section dimension, the spacing of steel reinforcement, the thickness of the concrete protection for reinforcement, the theoretical model of bond strength and the loading are all considered as random variables. From the section of the maximum moment to the cutoff point of bars, the embedded length is 1.0~1.5 times the development length, the results show that the probability of bond failure is high due to a very high value of the coefficient of variation of bond-strength. However, the probability of bond failure can be limited below 0.00135 by increasing the amount of transverse reinforcement, by increasing the spacing of flexural reinforcement, or by increasing the thickness of the concrete protection for reinforcement. Design, according to the ACI Code, calls for the embedded length of bars from the section of the maximum moment to the cutoff point of bar being more than 1.7 times the development length. The value of probability of bond failure can still be limited below the value of probability of flexural failure by providing sufficient transverse reinforcement. |
本系統中英文摘要資訊取自各篇刊載內容。