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.

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.

This paper demonstrates that,calculation formulas and pictures of theinternal force of single span beams in rectangular nonuniform section are verysimple in actual engineering.

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.

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.

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.

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

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.

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.