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跨梁
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  span beam
     Stability Analysis of Large Span Beam Bridges with High Piers
     高墩大跨梁桥稳定性分析
短句来源
     Two issues related to the stability of large span beam bridges with high piers are introduced and discussed in this paper.
     对于高墩大跨梁桥,由于其日益广泛地采用高强材料和薄壁结构,因而稳定问题也就更显重要。
短句来源
     The result show that lightweight aggregate concrete to be in large span beam structure has the obvious technical and ecnomic effects.
     计算结果表明,轻骨料混凝土应用于大跨梁结构具有明显的经济效益。
短句来源
     As prestressed wire prolongs multispan and multiwave,the loss of prestress due to friction between the wire and hole is more server than in single span beam.
     多跨预应力梁的预应力索由于超长、多波,因而与孔道壁之间的摩擦引起的预应力损失就较单跨梁中的损失要严重,而且摩擦损失将占总的预应力损失的绝大部分。
短句来源
     Through model test,it analyzes damage mode of adding batten plate under vertical load,strain relation of load with flexibility、load with steel bar and carbon cloth are given,it obtains dangerous section of span beam when researched damage mechanism,which make structure can reach prospective effect.
     通过模型试验,对附加缀板式这种新型结构加固后在竖向荷载作用的破坏形式进行了分析,给出了荷载与挠度、荷载与钢筋及碳纤维应变的关系,并对结构破坏机理进行了研究,得出各跨梁的危险截面,使该结构达到了预期的加固效果。
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  span beams
     THE ANALYSIS OF CRITIAL PRESSURE OF TWO SPAN BEAMS HINGED AT BOTH ENDS
     两端铰支二跨梁的临界压力分析
短句来源
     This paper demonstrates that,calculation formulas and pictures of theinternal force of single span beams in rectangular nonuniform section are verysimple in actual engineering.
     本文推导了矩形变截面单跨梁的内力计算公式,并制成图表,便于结构计算中应用。
短句来源
     In this paper, treating composite materials multi-span continous composite beams as single-span beams; The vibration mode functions and frequenoy equations which are aqqlyed to the nature vibration of composite materials multi-span continous composite beams are obteained by using Timoshenko's vibration theory of beam and Laplace's trasformation.
     本文将复合材料多跨连续组合梁按单跨梁来处理,采用铁摩辛柯梁振动理论及Laplace变换导出了复合多跨连续组合梁自振时的振型函数及频率方程.
短句来源
     The sormula of critical pressure on two span beams which is supported at the middle is deduced in this articlal. The formula is the same as that.
     推导出了两端铰支二跨梁的临界压力表达式 ,具体导出了两跨长度相等情况下的临界压力计算公式 ,此公式与等长度的单跨梁的欧拉临界压力公式的形式完全相同
短句来源
  “跨梁”译为未确定词的双语例句
     Transverse Free Vibrations of Continuous Equispan Beams on Springs
     弹性点支连续等跨梁的横向振动(Ⅰ)──自由振动
短句来源
     Research into Design Theory of Beam Bridges with High-piers and Long-spans
     高墩大跨梁桥设计理论研究
短句来源
     Application of Equivalent Load in Test of Singlespan Static Beam
     等效荷载在静定单跨梁试验中的应用
短句来源
     The Benefit Analysis of the Light-bone-material-concrete Used in Big-span-girder-structure
     轻骨料混凝土在大跨梁结构中应用的效益分析
短句来源
     This article introduces the results in calculating and comparing the maths model between single-span beam and multispan beam in the design of anti-wind pressure for curtain wall' s vertical column.
     介绍了幕墙立柱抗风压设计计算时分别采用单跨梁与多跨铰接梁受力模型的计算及结果比较。
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  span beam
The bridge is modeled as a single span beam with even and uneven decks.
      
The significance of prefailure joint dilatancy is investigated by means of a simple analysis of a single span beam.
      
Transverse vibrations of a three-span beam under a moving load
      
Transverse vibrations of a two-span beam with elastic central support under the action of a moving point force
      
Transverse vibrations of a single-span beam with the motion of a bending moment
      
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  span beams
The cross sections of continuous multi-span beams are sometimes increased suddenly, or stepped, at interior supports of continuous beams to resist high negative moments.
      
Several numerical examples of multi-span beams and of columns are given using a computer package developed in standard FORTRAN 77.
      
(span) beams were tested on three-point or four-point bending.
      
The proposed procedure is illustrated for dynamically loaded layered single-span beams with interlayer slip, and the improvement in comparison to the classical modal analysis is demonstrated.
      
Bond and small scale beam tests were carried out in the laboratory; longer span beams were fabricated commercially.
      
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This paper deals with the effect of shear deformation arid rotary inertia on the frequencies ef flexural vibration of short turbomachinery blades and rotors. The ditferential equations of motion are derived and tranformed into a set of linear simultaneous algebraic equations by using Taylor's series. Results for short cantilever beams show good agreement with those obtained by other investigators. Finally, the critical speeds of welded disc turbine rotor are found by the conventional trial and error procedure....

This paper deals with the effect of shear deformation arid rotary inertia on the frequencies ef flexural vibration of short turbomachinery blades and rotors. The ditferential equations of motion are derived and tranformed into a set of linear simultaneous algebraic equations by using Taylor's series. Results for short cantilever beams show good agreement with those obtained by other investigators. Finally, the critical speeds of welded disc turbine rotor are found by the conventional trial and error procedure. Any critical speed may be calculated with equal ease. The rotor may have anv number of spans. The shaft journals may be considered to be elastically supported in the bearing. The so-called "gyroscopic effect" may be readily taken into account

本文探讨剪切变形和转动惯量对梁的固有频率影响的目的在于提高涡轮机高压级叶片和低压转子的振动特性理论计算值的精确度。将叶片或转子分成为不同形状截面的微段梁,在微分方程建立过程中考虑剪切变形和转动惯量的影响,应用泰乐级数计算函数近似值得到截面间的递推方程。应用这种方法,计算了悬臂梁和简支梁的固有频率。悬臂梁计算结果与国外其他作者的结果所进行的比较符合非常良好。最后,以焊接转子为计算实例,说明这种方法同样适用于弹性支承变截面多跨梁,还可以考虑陀螺效应的影响。

In this paper, by means of analysis and programed computation the natural frequency characteristic curvcs of one span to three span elasti(?) supported beams have been plotted and the rule governing the change of natural vibration modes has been explained. It has been found that for a N span beam, for every N modes from lower to higher orders there is a frequency point, common to the N modes of vibration, and that the stiffness ratios corresponding to these points are independent of the number of spans. By using...

In this paper, by means of analysis and programed computation the natural frequency characteristic curvcs of one span to three span elasti(?) supported beams have been plotted and the rule governing the change of natural vibration modes has been explained. It has been found that for a N span beam, for every N modes from lower to higher orders there is a frequency point, common to the N modes of vibration, and that the stiffness ratios corresponding to these points are independent of the number of spans. By using these curves, the natural frequencies of elastic supported beams corresponding to various modes can be evaluated exactly and conveniently. There is presented a simple algorithm for calculating the natural frequencies of beams on elastic supports with mass.

本文通过分析和程序计算,作出一跨至三跨弹支粱固有频率特性曲线,阐明振型演变规律,并得出对于多跨梁从低阶到高阶每N个模态振型有一个固有频率相等的点,而且这些点所对应的刚度比与跨数无关.应用该曲线可准确、方便地求出相应于各种振型的弹支梁的固有频率.还提出考虑支承参与振动质量的固有频率的简便算法.

In nuclear reactor engineering, the vibration of fuel element rod aud tube of heat exchanger is frequently induced by coolant flow. They always strike intermediate supporting baffles during their vibration. This kind of impact is intermittent and repeated. As a result, the wear and fretting of tube will be created and the damage would be caused finally. Therefore, it is very important to study dynamic effect of this impact. Recent years, the investigation for this problem has been made by some authors.The dynamic...

In nuclear reactor engineering, the vibration of fuel element rod aud tube of heat exchanger is frequently induced by coolant flow. They always strike intermediate supporting baffles during their vibration. This kind of impact is intermittent and repeated. As a result, the wear and fretting of tube will be created and the damage would be caused finally. Therefore, it is very important to study dynamic effect of this impact. Recent years, the investigation for this problem has been made by some authors.The dynamic effects of impact for a tube with fixed ends against multiintermediate supports have been studied experimentally and analytically in this paper. The tested model is a stainless steel tube of 13.20 mm O. D., 10.20 mm I. D. and 1436 mm in length. Its ends are clamped. The baffles are simulated with support plates.Their number is up to three and their positions are adjustable. The rigidities of support plates are different. The clearances between the tube and plates are in the range from 0.20mm to1.00 mm. The tested tube is exited by unload The duration and number of times for impact, and time-history of response of the tube motion are recorded.The test results show the tube dominantly vibrates in the form of beam with single span, but the fundamental frequency is higher than its first natural frequency. The curve of the ratio of fundamental frequency of response to first natural frequency of beam vs. the ratio of initial displacement to clearance is given. Also the curve of the duration for contact with support vs. initial displacement-clearane ratio is obtained. The calculation is made by the theory of beam vibration. The analytical and experimental results are in good agreement. Many components of higher frequency are introduced into the response of motion. Their frequencies depend upon the position of support and their magnitudes are relative to intensity of impact. The linear spectrum of frequency for the motion response is given by Fourier Analysis.

本文以两端固支梁为模型,用分析和实驗方法討論了梁在自由振动过程中与带間隙的支撑碰撞的动力效应。目的是探討碰撞对梁的振动特性和振动响应的影响。实驗分別用了一个、两个和三个支撑板以及四种不同尺寸的支撑板,支撑板的位置是可調节的,支撑板与梁之間的間隙在0.25~1.00mm范围內改变。主要做了单边碰撞实驗,对双边碰撞实驗做了初步观察。实驗結果表明:梁的基阶振动頻率接近单跨梁的基阶固有頻率,但碰撞作用使基阶振动頻率明显地提高了。碰撞引起了許多高頻成分。最后,以梁中点初位移与間隙尺寸之比为参数給出了基阶頻率的变化曲綫,第一次碰撞开始的时間、第一次碰撞的持續时間的变化曲綫。对測得的位移响应时程曲綫进行了Fourier分析,并給出了离散譜綫。分析給出了中点有一个刚性支撑的碰撞結果,与测量結果符合良好。

 
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