Construction film structure pre-tension measurement method and apparatus thereof

Abstract

The invention provides a building membrane structure pretension force measuring method and a measuring device thereof. The method comprises the steps of launching a particle bead to a tensioned membrane with a fixed boundary to vibrate the membrane which rebounds the bead; measuring the incident speed v0, the return speed vt, the membrane middle point maximum displacement (amplitude) Tmax and the bead mass m0 of the bead in the tensioned membrane with the same fixed boundary; changing the latitude and longitudinal directions, measuring Tmax, v0 and vt; according to the formula: pi<2>habTmax<2>[((sigma0x / a<2>)+(sigma0y / b<2>))+(pi<2> / 32)((Ex / a<4>)+(Ey / b4))Tmax<2>]=4m0(v0<2>-vt<2>), measuring two groups of Tmax, v0 and vt, to calculate the membrane tension force sigma0x and sigmax0y. The method is based on the membrane large deflection theory, to approach actuality theoretically and obtain high theory accuracy, having wide application for different membranes. The method can measure two orthogonal pretension forces of membranes and the tension force of a membrane under different loads. The invention can be quickly applied in actual projects. The measuring device has simple structure, low cost and simple application.

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 an architectural membrane structure and a measuring device for realizing the method. Background technique [0002] The rigidity of the architectural membrane structure is achieved by applying pre-tension to the membrane. The greater the pretension of the membrane material, the greater the stiffness of the membrane structure, and the stronger its ability to withstand external loads. However, the greater the pretension of the membrane, the higher the requirements for the construction tension equipment and the anchoring conditions of the boundary members, and the lower the strength reserve. However, if the pretension of the membrane material is too small, its out-of-plane rigidity will be too small. Under the action of out-of-plane loads such as wind, rain and snow, the deformation will be large, wh...

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Problems solved by technology

However, in the actual measurement of this method, its boundary conditions are difficult to meet, and the measurement process is relatively complicated, and the measurement device is not convenient to carry

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