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单跨梁     
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  single beam
     Bifurcated point elastic and elastic-plastic lateral bucklingcritical loads of single beam and girder truss of bridging machine are computed with the helpof Potential Energy Stationary Principle,The Numerical results are compared with classicalsolutions of single-span beam.
     采用势能驻值原理,计算了单梁和造桥机钢桁梁的分枝点弹性和弹塑性侧倾失稳临界荷载,并与单跨梁的经典解结果进行了比较。
短句来源
  single-span beam
     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。
短句来源
     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
     幕墙立柱抗风压设计中单跨梁与多跨梁模型的计算与比较
短句来源
     Bifurcated point elastic and elastic-plastic lateral bucklingcritical loads of single beam and girder truss of bridging machine are computed with the helpof Potential Energy Stationary Principle,The Numerical results are compared with classicalsolutions of single-span beam.
     采用势能驻值原理,计算了单梁和造桥机钢桁梁的分枝点弹性和弹塑性侧倾失稳临界荷载,并与单跨梁的经典解结果进行了比较。
短句来源
     The vibration mode functions and frequency equations of laminated continuousbeam during nature vibration are obtained in this paper on the basis of considering many--spanlaminated beam as single-span beam by using laplace transform
     把多跨层合连续梁按单跨梁来处理,利用Laplace变换推导出层合连续梁自振时的振型函数及频率方程。
短句来源
     The general formulas of internal forces and displacements of skewly supported single-span beam are deduced from the energy principle.
     首先从能量原理出发 ,推导了斜支单跨梁内力及变形计算的一般公式 .
短句来源
  single span beam
     Byusing the reciprocal displacement theorles,the relationship between the deflection and the angles of the rotation and the principles of the supersition, it was convenient to find the displacement at any point and the angles of the rotation at any cross section of the single span beam through by means of the deflection curve equation.
     本文利用位移工等定理,挠度转角之间的关系及达加原理,使用单位载荷挠曲线方程,可以方便地求得单跨梁任意处的挠度、转角。
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
  single span beams
     CALCULATION FORMULAS AND PICTURES OF THE INTERNAL FORCE OF SINGLE SPAN BEAMS IN RECTANGULAR NON-UNIFORM SECTION
     矩形变截面单跨梁的内力计算公式和图表
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。
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      single beam
    Second, we analyze, in terms of weak localization of EP's, the coherent light emission in the direction normal to the surface under a single beam pumping tilted from the normal to a planar semiconductor microcavity.
          
    A highly efficient summing of mutually coherent beams (channels) into a single beam with the same divergence and aperture (an inverse acoustooptic problem) is realized via diffraction in a Bragg cell.
          
    It is shown for the first time that holograms can be rewritten by a single beam of incoherent light without an accompanying growth of the frequency of the carrier fringes of the rewritten holograms.
          
    The spectral combination characteristic of a grating is the capability of combining multiple light beams of different wavelengths incident from specific angles into a single beam.
          
    The results show that the double beam technique eliminates instrumental drift in the single beam measurement and therefore the stability of the system increases by more than 20%.
          
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      single-span beam
    Transverse vibrations of a single-span beam with the motion of a bending moment
          
    The Donne1 equations for a cylindrical shell were used and mode shapes of a single-span beam satisfying pertinent boundary conditions were obtained.
          
      single 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.
          


    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。

    The present Paper,based on a study of the Simple cross beams under different loads and varied boundary conditions,analysizes the conditions of the joints between the section of beam,to draw a formula which makes it possible for the computer to calculate the continuous beam flexivity under linear loads.

    本文用最小二乘法研究各种荷载及边界条件的单跨梁弯曲的基础上,分析了每跨梁之间连续处的连续条件,由此导出便于上机计算的受线性荷载的连续梁挠度公式。

    In this paper, the effect of loading forms and supporting types on the ultimate stress of unbonded prestressed tendons is analyzed by using the coefficients of loading and supporting condition in thedeflection formula of onespan beams. Analysis results show that the accuracy and the available range of formulas to calculate the ultimate stress of unbonded prestressed tendons, which are used in practical design now, would be limited without considering those factors.

    本文通过单跨梁跨中挠度计算公式中的荷载与支座条件系数,将荷载形式与支座条件对无粘结预应力筋极限应力的影响进行了计算分析。分析结果表明,这一因素对无粘结筋极限应力有较大影响,如在设计中不考虑这一因素,所使用的无粘结筋极限应力计算式的计算精度和适用范围会受到较大影响和限制。

     
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