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【求助】50金币请求翻译
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不要谷歌翻译的啊！要求完全是英语啊！谢了啊 高拱坝在坝体中过大的温度应力使坝体出现温度裂缝。为了控制坝体中的温度裂缝，在工程实践中使用较多的做法是在坝体中设置诱导缝。目前，关于诱导缝的研究主要集中于其等效强度及诱导缝开裂准则的研究。其中对诱导缝等效强度的研究包括从名义断裂韧度尺寸效应、失稳韧度和有效裂纹扩展量等方向展开。名义断裂韧度虽可反映混凝土的变化规律，但其本身却没有实际的物理意义；而已有模型中的失稳韧度被认为是材料常数，而目前的研究显示当试件的尺寸小于750mm时失稳韧度仍存在尺寸效应，模型的有效裂纹扩展量经计算也是常数,而实际有效裂纹扩展量也不是固定不变的。本文将混凝土失稳韧度尺寸效应公式和反映实际规律的效裂纹扩展量公式应用到等效断裂模型中，在应用于双向间隔诱导缝等效强度公式中，得到了修正后的不同形式诱导缝的等效强度公式 混凝土亚临界扩展量的计算 研究表明，混凝土I型裂缝失稳扩展前，存在主裂缝的亚临界扩展。已有文献显示，混凝土裂缝的有效裂缝扩展长度存在尺寸效应，并得出对于大体积混凝土而言，单直线软化模型所得计算结果更接近实测值的结论。文献基于名义断裂韧度尺寸效应公式得到了反映尺寸效应规律的有效裂缝扩展长度△ac*的表达式。这里在文献研究基础上将失稳断裂韧度的尺寸效应公式应用于单直线模型、双直线模型和抛物线模型的有效裂缝扩展长度的表达式。 |
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tianyaren8078
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2楼2010-03-23 15:48:12
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希望高手改一改啊！这是我自己写的。有不少错误啊！谢谢了啊 If there is too large a temperature stress in the high arch dam, it will appear the temperature cracks.In practice, we use to set the dam induced joints, in order to control the temperature cracks of the dam. At present, a lot of people study on the induced joints, which is equivalent to focus on its strength and cracking criteria[1-6].They study induced joint and equivalent strength from the size effect, unstable crack propagation toughness, effectively and so on. Although the nominal frature toughness could reflect the variation of concrete, but itself is no real physical meaning; but there are models in the instability of being considered to be material constans, and the present studies have shown that when the sample size is less than 750mm, the instability still exist size effect, and calculated the model of the effective amount of crack propagation is constant, while the real effective amout of crack propagation expending is not constant. This article will use the instability toughness of size effect of concrete formulas and reflecting the actual amount of effective crack propagation formala to apply to the effective crack model . When we use the two-way interval induced joints equivalent strength formula, it has been revised to different forms of induced joints the equivalent intensity formula. Studies have shown [9,10] that concrete I-crack extension before instability, there is sub-critical expansion of the main crack. Existing literatures [11] showed that crack propagation in concrete cracks in the length of the effective existence of size effect, and draw for large volume concrete terms, a single straight line softening model calculation results derived from the measured value is closer to conclusion. Literature [12] based on nominal size effect of fracture toughness have been reflected in the formula size effect law of effective crack propagation length △ ac * expression. Here in the literature [11,12] research base will be unstable fracture toughness of the size effect formula is applied to a single straight-line model, two-line model and the parabolic model of effective crack propagation length of the expression, |
3楼2010-03-27 08:30:46
ysm56789
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yypmake(金币+1):谢谢参与
yypmake(金币+10): 2010-03-28 08:23
yypmake(金币+3): 2010-03-31 08:28
yypmake(金币+1):谢谢参与
yypmake(金币+10): 2010-03-28 08:23
yypmake(金币+3): 2010-03-31 08:28
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If there is too large a temperature stress in the high arch dam, it will appear the temperature cracks. I edit this for you: The high arch dam will apear temperature cracks if there is a high temperature stress. |
4楼2010-03-27 16:07:59
5楼2010-03-28 15:44:08
ysm56789
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yypmake(金币+80):谢谢啊 2010-03-29 11:24
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”In practice, we use to set the dam induced joints, in order to control the temperature cracks of the dam. At present, a lot of people study on the induced joints, which is equivalent to focus on its strength and cracking criteria[1-6].They study induced joint and equivalent strength from the size effect, unstable crack propagation toughness, effectively and so on. Although the nominal frature toughness could reflect the variation of concrete, but itself is no real physical meaning; but there are models in the instability of being considered to be material constans, and the present studies have shown that when the sample size is less than 750mm, the instability still exist size effect, and calculated the model of the effective amount of crack propagation is constant, while the real effective amout of crack propagation expending is not constant. This article will use the instability toughness of size effect of concrete formulas and reflecting the actual amount of effective crack propagation formala to apply to the effective crack model . When we use the two-way interval induced joints equivalent strength formula, it has been revised to different forms of induced joints the equivalent intensity formula. Studies have shown [9,10] that concrete I-crack extension before instability, there is sub-critical expansion of the main crack. Existing literatures [11] showed that crack propagation in concrete cracks in the length of the effective existence of size effect, and draw for large volume concrete terms, a single straight line softening model calculation results derived from the measured value is closer to conclusion. Literature [12] based on nominal size effect of fracture toughness have been reflected in the formula size effect law of effective crack propagation length △ ac * expression. Here in the literature [11,12] research base will be unstable fracture toughness of the size effect formula is applied to a single straight-line model, two-line model and the parabolic model of effective crack propagation length of the expression,“ Ｉ ｈｏｐｅ ｙｏｕ ｌｉｋｅ ｉｔ ： ＂In practice, we commonly use the dam induced joints to control the temperature cracks. Recently, many studies are focus on the induced joints, which are equivalent to focus on its strength and cracking criteria [1-6].They studed induced joint and equivalent strength from the size effect, unstable crack propagation toughness, effectiveness and so on. Although the nominal frature toughness could reflect the variation of concrete, it has no real physical meaning; also there are models in the instability of being considered to be material constans. Present studies have shown that the instability still has existing size effect while the sample size is less than 750mm. Furthermore, the calculated model effectiveness of crack propagation is constant, while its expending is not constant. Therefore, the paper will use the instability toughness of size effect of concrete formulas to reflecting the actual amount of effective crack propagation formula, which can actually apply to the effective crack model. Moreover, it has been revised to different forms of induced joints the equivalent intensity formula when we use the two-way interval induced joints that is equivalent to the strength formula. Existing studies have shown [9,10] that concrete I-crack extension has sub-critical expansion of the main crack before instability [11], has crack propagation in concrete cracks in the length of the effective existence of size effect, and has draw for large volume concrete terms, a single straight line softening model calculation results derived from the measured value and all of them are approaching to a conclusion. Literature [12] has been reported in the formula size effect law of effective crack propagation length △ ac * expression based on nominal size effect of fracture toughness. Also literature [11,12] research base will be unstable fracture toughness of the size effect formula, which is applied to a single straight-line model, two-line model and the parabolic model of effective crack propagation length of the expression＇ |
6楼2010-03-28 17:10:18
liunynh
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7楼2010-03-30 21:52:19
hqzhou0817
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8楼2010-03-30 22:59:19
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