[1]丁大钧.关于钢筋砼受弯构件裂缝及变形的计算[J].东南大学学报(自然科学版),1964,6(5):55-68.[doi:10.3969/j.issn.1001-0505.1964.05.004]
 Ding Dah-Jung.On the calculation of crack width and deflection of R, C. beams[J].Journal of Southeast University (Natural Science Edition),1964,6(5):55-68.[doi:10.3969/j.issn.1001-0505.1964.05.004]
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关于钢筋砼受弯构件裂缝及变形的计算()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
6
期数:
1964年第5期
页码:
55-68
栏目:
本刊信息
出版日期:
1964-12-30

文章信息/Info

Title:
On the calculation of crack width and deflection of R, C. beams
作者:
丁大钧
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Author(s):
Ding Dah-Jung
关键词:
钢筋砼受弯构件 变形 梁挠度 修正系数 苏联 长期荷载 公式 挠度系数 配筋率 支座弯矩
分类号:
+
DOI:
10.3969/j.issn.1001-0505.1964.05.004
摘要:
在本文中,首先对国际上关于鋼筋砼受弯构件的裂縫和变形計算的現阶情况和存在的一些問題作了概述. 其次利用苏联規范中的公式計算的平均裂縫寬度与国外的某些試驗中量得的最大裂縫寬度比較,根据統計原理,来討論我国規范草案中建議确定最大裂縫寬度的系数。作者还指出苏联規范中对部分长期載时計算裂縫寬度的总和公式的不合理情况,因此对裂縫計算,也包括变形計算,提出了綜合公式,这不但可消除这些不合理情况,同时計算也簡单些。对双筋梁刚度計算中系数γ′內的ν值,作者提出了新的建議,并和实驗挠度进行比較,証明这一建議的合理性。最后对考虑連續梁由于裂縫所引起的內力重分布时支座弯矩修正系数提出了建議,并和一些实驗結果进行了比較計算,同时繪制了几种常遇到的荷載情况下的挠度系数曲綫以簡化在实际工作中連梁挠度的計算。
Abstract:
In this paper, the author summarizes first the existing state and some problems on the calculation of crack width and deflection of R. C. beams. Secondly, with the average crack widths calculated by means of the formula recommended in Russion Code, the author compares the max. crack widths measured from some foreign tests, and according to the principles of statistics, gives a discussion about the coefficient for determining the max. crack width suggested by Chinese Code (project). Having pointed out the unreasonable conditions of the summation formula for calculating the crack width of beams subjected to partial long-time loads in Russian Code, the author suggests two synthetic formulas for the calculation of crack width and deflection, by which we can not only eliminate those unreasonable conditions, but also make the calculation much simpler. For the value of ν in the coefficient γ’ which is used to calculate the stiffness of doubly reinforced beams, the author suggests a new recommendation and makes a comparison with the experimental deflections to prove that this recommedation is reasonable. Finally, for the corrected coefficients of the moments at supoart to consider the redistribution of stresses in the continuous beams due to cracking, the author also makes a new recommendation, and carries out comparative computation with some measured deflections from tests. At the same time, for some particular loading conditions which may take place frequently in practice, the author prepares curves of deflection coefficients in order to simplify the calculation of deflection of continuous beams in practical designs.

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更新日期/Last Update: 2013-05-01