Method for measuring pretension of tensioned membrane structure
A measurement method and pre-tension technology, applied in the direction of tension measurement, etc., can solve the problems of difficult measurement of film amplitude T, difficulty in the development of measuring instruments, and difficulty in obtaining the center point, so as to save measurement cost and time, save research and development costs, The effect of reducing the difficulty of research and development
Inactive Publication Date: 2011-04-27
CHONGQING UNIV
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Problems solved by technology
There are many parameters to be measured, the process is cumbersome, the calculation error caused by the accumulation of errors increases, and in the actual measurement, the film amplitude T max The measurement is difficult, and the development of measuring instruments is difficult
2) For amplitude T max is not clearly defined
But in actual engineering measurement, when the membrane vibrates, the amplitude T of the center point max is difficult to obtain
Method used
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example 1
[0071] For the measurement of the pretension of a local area of a membrane structure project, the four-sided fixed-supported rectangular boundary with a size of 300*500 is isolated, and a steel ball with a diameter of 6mm is used. The launch speed is 14m / s and 20m / s respectively. The reflection speeds are 6.58m / s and 8.71m / s respectively. Using linear regression, the parameters k'=0.355 and c=1.61. Looking at Table 2, it can be seen that it is similar to the tension combination in which the tension in the x direction is about 7.1KN / m and the tension in the y direction is about 5.2KN / m. The x-direction stress σ corresponding to this stress combination 0x =7.1 / 0.78=9.1Mpa, y-direction stress σ 0y =5.2 / 0.78=6.67Mpa, and the pretension σ of the original model 0x =8.972Mpa,σ 0y =6.505Mpa is relatively close, which proves the feasibility of this method. In order to determine the pre-tension more accurately, you can refine Table 2 and divide the orthogonal two-direction pre-tension ...
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Abstract
The invention provides a method for measuring pretension of a tensioned membrane structure, which comprises the following steps of: 1. shooting a particle globule into a tension membrane surface with a fixed border and rebounding the globule; 2. meanwhile, measuring the shooting speed v0 and the back-shooting speed vt of the globule in the tension membrane surface with a fixed border; 3. measuring the shooting speed v0 and the back-shooting speed vt of the globule in the tension membrane surface with the same fixed border; shooting the same point of the membrane surface at different shooting speed and measuring the other group on shooting speed v'0 and back-shooting speed v't; 4. substituting the two groups of shooting speed and back-shooting speed (v0, vt) and (v'0, v''t) into the formula vt = k'v0+c=f(sigma0x, sigma0y) v0+g (sigma0x, sigma0y) and solving to obtain k' and c; and 5. obtaining the pretensions sigma0x and sigma0y of a membrane material by searching the regression coefficient table of vt=k'v0+c under the membrane material pretension grade. By means of the method in the invention, based on numerical analysis and theoretical demonstration, the direct relation among shooting speed, back-shooting speed and membrane surface pretension is found out, a specific method is provided for obtaining the pretension of the membrane material just by measuring shooting speed and back-shooting speed, and the feasibility of the method is verified by calculation instances.
Description
Technical field [0001] The invention belongs to the technical field of engineering measurement and monitoring, and specifically relates to a method for measuring the pretension of a building tensile membrane structure. Background technique [0002] The membrane structure originated from ancient tents. Earlier records include animal hides in Ukraine 100,000 years ago, and black tents in Afghanistan in the 18th century. The modern membrane structure is a brand-new form of building structure. It integrates architecture, structural mechanics, fine chemical engineering, material science, and computer technology. It has a high technical content. Membrane materials have become one of the main building materials. According to the combined form of the membrane structure, the membrane structure can be divided into an inflatable membrane structure, a skeleton supported membrane structure, a cable membrane dome structure, and a tensile membrane structure. The tensile membrane structure is c...
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IPC IPC(8): G01L5/04
Inventor 郑周练刘长江何晓婷宋伟举徐云平龙俊龚文川吴奎郭建军孙俊贻
Owner CHONGQING UNIV
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