Method for detecting glass curtain wall loosening and estimating falling risk
A glass curtain wall and glass technology, applied in measuring devices, instruments, and mechanical devices, etc., can solve the problem that economic losses cannot be measured with specific data, and achieve the effect of simple non-destructive testing methods, cost saving and safety accident avoidance.
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Embodiment 1
[0052] Example 1: Laboratory simulation of safety detection of glass curtain wall structures supported by different boundaries
[0053] 1) Preparation of glass samples: 300×300×4mm ordinary soda lime silicate glass is used in this test, and the glass surface is cleaned before the test;
[0054] 2) The measured glass size and material parameters on site are a=300mm, b=300mm, h=4mm, E=70GPa (modulus of elasticity), v=0.24 (Poisson's ratio), m=10kg / m 2 . Calculate according to the analytical expressions of formula (1) and formula (2), and obtain the analytical solution natural frequency value of the glass under test in the state of fixed support and simple support (see Table 1); or obtain the fixed support according to the finite element analysis method And the natural frequency value of the finite element solution in the simply supported state (see Table 1). Through the calculated natural frequency, it can be obtained that the frequency distribution range of the measured glass shoul...
Embodiment 2
[0062] Example 2: On-site glass curtain wall inspection and safety rating evaluation
[0063] Project introduction: The curtain wall of a building is an exposed frame structure with glass panels inlaid in an aluminum frame. It was completed in August 2000. It is understood that the curtain wall glass is ordinary flat glass, the size of the glass is: 1415mm×1860mm×6mm, the glass elastic modulus is 72GPa, the Poisson's ratio is 0.24, and the density is 2500kg / m 3 .
[0064] Evaluation standard division: According to the analytical expressions of formula (1) and formula (2), the corresponding frequencies of the single glass panel of the curtain wall under the condition of fixed support and simple support are 22 Hz and 11.8 Hz, respectively. In the same way as the steps 3) and 4) of the embodiment, the same glass plate was tested in the laboratory, and the measurable frequency range was between 13-20Hz, the loosening frequency was 15.5Hz, and the loosening frequency was used as the di...
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