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.

Active Publication Date: 2008-10-29
国检测试控股集团云南有限公司
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  • Abstract
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Problems solved by technology

For the glass industry and construction industry, the annual cost of building curtain wall glass is as high as hundreds of millions of yuan. It is obviously a major loss t

Method used

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  • Method for detecting glass curtain wall loosening and estimating falling risk
  • Method for detecting glass curtain wall loosening and estimating falling risk
  • Method for detecting glass curtain wall loosening and estimating falling risk

Examples

Experimental program
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Example Embodiment

[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...

Example Embodiment

[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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Abstract

The invention relates to a method for detecting loose glass curtain walls and predicting falling risks, which comprises the following steps (1) determining a glass reference frequency range according to the parameter of glass plate used in a glass curtain wall to be detected; (2) conducting a laboratory simulation test for the same glass plate; measuring inherent frequencies corresponding to different fixed states; obtaining a measurable frequency range Omega down and Omega up, and loose frequency Omega loose in the reference frequency range; conducting evaluation and classification by taking the difference between the two extreme values, namely Omega down and Omega up, and the loose frequency, namely Omega loose as a security interval and a danger interval; (3) conducting vibration signal sampling and detection for the glass curtain wall in the field and obtaining the actually measured frequency of the glass curtain wall; (4) comparing the actually measured frequency value with coherent frequency classification, and obtaining the safety and reliability grade of the glass curtain wall in the process of use.

Description

Technical field [0001] The invention relates to a non-destructive online detection technology for building curtain walls, in particular to a method for testing the safety and reliability of curtain wall glass, which uses a method of combining natural frequencies and mechanics to test the glass curtain wall to perform non-destructive online reliability testing on the glass curtain wall, thereby predicting Risk of loosening and falling of the glass curtain wall. Background technique [0002] Since the 1980s, many large and medium-sized cities in my country have successively built a large number of glass curtain wall buildings. Most of these buildings are in prosperous urban areas. Any break or fall of curtain wall glass may cause catastrophic consequences. In recent years, the safety hazards of curtain wall glass have increased, which has attracted the attention of many experts and the people. In the ten to twenty years of extensive use of curtain wall glass, the various properties...

Claims

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Application Information

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IPC IPC(8): G01N19/00
Inventor 包亦望邱岩刘小根
Owner 国检测试控股集团云南有限公司
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