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抗风的
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     Wind-resistant and Aseismic Analysis of Guang Chang International Center by Using MR and Viscous Dampers
     广畅国际大厦抗震和抗风的磁流变和粘滞阻尼减振分析
     Numerical simulation technology, which is based on Computational Fluid Dynamics (CFD), along with wind tunnel test, theoretical analysis and field measurement constitute the powerful tools in the field of wind engineering research.
     基于计算流体动力学(CFD)的风工程数值模拟技术(CWE)与风洞试验研究、理论模型和分析、现场测试一起构成建筑结构抗风的主要研究手段。
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     Wind-resistance of bridges in mountainous area is a difficulty in the wind engineering realm.
     山区桥梁抗风是风工程领域的难点。 国内外针对山区桥梁抗风的研究很少,文献资料匮乏,桥址附近的实测气象资料也严重不足。
短句来源
     Structural vibration control is a new research field for reducing vibration of structures subjected to earthquakes and windstorm.
     结构减震(振)控制是工程结构抗震抗风的一个新领域。
短句来源
     This paper summarize a large number of domestic and international documents about fluid-structure dynamic coupling action, the earthquake responses , case study of a wind destroyed aqueduct mechanism, the optimal design based on reliability analysis. Many fruits are collected in order to reduce or combat natural disasters to guarantees the security of the aqueduct.
     本文总结了国内外有关渡槽结构与水的流固耦合作用、渡槽地震响应、风荷载致渡槽破坏机理、基于可靠度的渡槽抗灾优化设计以及渡槽抗灾减灾设计措施等方面的大量文献,并参考目前已经相对比较成熟的桥梁抗震和抗风的研究成果,对渡槽的抗震与抗风问题进行研究。
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     Intervention with anti-H.
     H.
短句来源
     Anti-H.
     H .
短句来源
     ADVANCE OF THE SUMMER MONSOON OVER THE SOUTH CHINA SEA
     南海夏季风的推进
短句来源
     A PRELIMINARY ANALYSIS 0F WIND OVER JIA0ZH0U BAY
     胶州湾风的初步分析
短句来源
     On the Forming of the Style of Wang Anshi's Ci
     论王安石词风的形成
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野麻屬夾竹桃科,是一种野生的高級纖維植物。野麻在我国共有兩屬三种,即大花罗布麻,紫斑罗布麻和披針叶茶叶花。大花罗布麻是荒漠、半荒漠地帶的种,在我国广泛的分布于新疆,甘肃河西,青海柴达木盆地及都蘭和内蒙的西部,而以新疆分布的为最多,生長的也最茂盛,其它各地不見分布。紫斑罗布麻仅見于新疆,远不如大花罗布麻和茶叶花常見。披針叶茶叶花在我国崑崙山、巴顏喀喇山、秦嶺、淮河以北的西北及北方各省都有分布,而以新疆、甘肃河西、青海、山东沿海及河北省分布为最多。各种野麻都是多年生草本植物,具強大的多年生的根莖及根,用种子及繁殖根进行繁殖。野麻均生于低平的冲积土壤上,一般均依強大根系吸收地下潛水,故能杭大气干旱,能抗酷热,酷寒,也能抗风。此外,茶叶花的抗淤抗涝性相当強,罗布麻适应流沙的力量也相当強,野麻的抗鹽性也相当強,一般多分布于輕鹽化的土壤上,而且生長很好。野麻是我国西北及沿海鹽碱荒地上的主要植物。收割与管理野麻田是利用这些荒地的重要途徑。野麻是一个有希望引种的植物。野麻的利用与引种苏联有丰富的經驗,应尽速加以吸取,以便能迅速地更好地利用与栽培这种資源植物。

A serious damage was done to the shade trees of Nanking City from typhoon in fall of 1962. It was found that the degree to which the shade trees were damaged was closely re-lated to (1) the characteristics of species such as crown structure, stem form, root system, resistance to excessive water and susceptibility to insects or pests; (2) the environment of plant-ing site such as direction and strength of wind, drainage and soil conditions; and (3) the plant-ing and management such as age and quality of seedlings,...

A serious damage was done to the shade trees of Nanking City from typhoon in fall of 1962. It was found that the degree to which the shade trees were damaged was closely re-lated to (1) the characteristics of species such as crown structure, stem form, root system, resistance to excessive water and susceptibility to insects or pests; (2) the environment of plant-ing site such as direction and strength of wind, drainage and soil conditions; and (3) the plant-ing and management such as age and quality of seedlings, planting techniques, protection, etc.

台风对行道树的影响与树种、立地条件和人为经营措施等多种因素有关。行道树风害的表现形式有风伤、风折、风歪和风倒四种。调查结果表明:枝叶风伤比较普遍,力枝风折仅占少数,主干风歪和风倒发展不平衡。受害比较严重树种包括英桐、刺槐和加杨等。树种的抗风能力,随空间和时间的转移而变化,因此结合不同的立地条件和城市特点来选择适宜的行道树种,具有很大的实践意义。外界环境因子对行道树风害的作用,实质上反映出是一种风、水、土的综合影响。我们认为在目前情况下,排除积水、改良栽植点上的土壤母质状况是防止行道树遭受风害的主要途径。

The evaluation of the gust-loading factor is very important to the design of structures subjected to lateral pressure from fluctuating wind. In the determination of the peak factor of fluctuating wind pressure, references or codes of U. S. S. R, Canada and France usually take approximations conerning the distributions of fluctuating wind pressure and of mass along the height of the structure. Another assumption made is that the wind pressure along the horizontal length of the structure is constant. Thus only...

The evaluation of the gust-loading factor is very important to the design of structures subjected to lateral pressure from fluctuating wind. In the determination of the peak factor of fluctuating wind pressure, references or codes of U. S. S. R, Canada and France usually take approximations conerning the distributions of fluctuating wind pressure and of mass along the height of the structure. Another assumption made is that the wind pressure along the horizontal length of the structure is constant. Thus only approximate values can be obtained. This paper takes into account of the change of the gust pressure both along the height and the length of the structure, makes use of the theory of random vibration for resolution into natural modes of free vibration of systems with infinite or finite degrees of freedom, and derives a formula for the determination of the gust-loading factor. Furthermore, on the basis of experimental data from some typical districts in China and in some other countries, numerical values of gust factors have been calculated. Simplified formula's and equivalent formulas for gust factors of structures having uniform stiffness and mass along the height have also been given. The author has also prepared tables for design purposes and for reference in case of revision of the code on design loading.

在脉动风压下结构的风振系数是结构物特别是高耸结构物在抗风计算中的重要问题。苏联、加拿大、法国等国文献或规范[1][2][4][8]等在确定脉动风压的动力系数时,未能完整考虑沿结构高度脉动风压和结构质量分布的影响,并且常作了沿水平长度风压是不变的假定,求出了风振系数,因此有了一定的偏差存在。本文按无限或有限自由度体系,根据随机振动理论,按振型分解的方法,考虑风压沿高度和长度的变化规律,求出了风振系数。根据国内外风压实测资料,求出了风振系数中有关数据。对于沿着高度其刚度和质量都比较均匀的建筑物,提出了简化公式和折算公式。有关数据已制表格,可供应用和荷载规范修订时参考。

 
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