Method for measuring pretension of tensioned membrane structure
A measurement method and pre-tension technology, applied in tension measurement and other directions, can solve the problems of difficult measurement of film amplitude T, difficulty in developing measurement instruments, and difficulty in obtaining the center point, so as to save measurement cost and measurement time, save research and development costs, The effect of reducing the difficulty of research and development
Inactive Publication Date: 2012-08-01
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 pretension measurement of a local area of a membrane structure project, isolate a four-sided fixed-supported rectangular boundary with a size of 300*500, use steel balls with a diameter of 6mm, and launch speeds of 14m / s and 20m / s respectively. If the corresponding The reflection speeds are 6.58m / s and 8.71m / s respectively. Using linear regression to obtain parameters k'=0.355, c=1.61, it can be seen from Table 2 that it is similar to the tension combination of about 7.1KN / m in x-direction tension and about 5.2KN / m in y-direction tension. 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 original model pretension σ 0x =8.972Mpa, σ 0y =6.505Mpa is relatively close, which proves the feasibility of this method. In order to determine the pretension more accurately, Table 2 can be refined, and the orthogonal two-way pretension levels can be divided into finer points (for exa...
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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 in particular relates to a method for measuring the pretension of a building tensile membrane structure. Background technique [0002] The membrane structure originated from ancient tents. The earliest records include animal skin shelters in Ukraine 100,000 years ago, and black tents in Afghanistan in the 18th century. The modern membrane structure is a new form of architectural structure, which integrates architecture, structural mechanics, fine chemicals, material science, computer technology, etc., and has a high technical content. Membrane materials have become one of the main building materials. According to the combination 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 tensioned membrane structure. The tensioned mem...
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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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