Civil engineering structure damage pre-warning method in consideration of temperature influence
A civil engineering structure and environmental temperature technology, which is applied in the fields of instrumentation, calculation, electrical digital data processing, etc., can solve the problems of not considering the influence of temperature on the early warning of civil engineering structure damage, and achieves novel methods, rigorous theory, and operability. strong effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0050] A damage warning method for civil engineering structures under the influence of temperature factors, the specific steps are as follows:
[0051] (1) Build AR model:
[0052]
[0053] In the formula, p represents the model order, is the autoregressive coefficient (AR model coefficient), Indicates the "historical value" X at time t-i t-i For the value X at time t t Contribution or influence, {ɑ t} means 0 and variance σ ɑ 2 white noise sequence;
[0054] (2) By performing principal component analysis on the above AR model coefficients and calculating the residual error of the principal component analysis results, the influence of ambient temperature on the AR model coefficients can be reduced;
[0055] a) Assuming a sample matrix Y∈R constructed from AR model coefficients n×N , perform singular value decomposition on the covariance matrix of the sample matrix Y:
[0056] YY T =USU T (2)
[0057] In the above formula, U is an orthogonal matrix, that is, ...
Embodiment 2
[0077] A three-dimensional finite element model of a four-layer framework is established by using ANSYS, such as figure 1 As shown, the basic parameters: the density is 7800Kg / m 3 , Poisson's ratio μ=0.3. Columns, beams and supports use BEAM4 unit, the roof adopts SHELL63 unit, and the accumulation mass on the roof adopts MASS21 unit for simulation.
[0078] The model has a total of 32 nodes, 192 degrees of freedom, 50 BEAM4 units, 1 SHELL3 unit, 4 MASS21 units, 7 unit section types, and the model is fixed to the foundation.
[0079] In this example, the oblique braces on the Y-direction surface II (6) are damaged to different degrees as the research object. The damage is achieved through the reduction of the elastic modulus. The temperature range is -20°C to 40°C. The elasticity of steel Modulus and temperature relationship as figure 2 shown.
[0080] The numerical simulation considering the influence of temperature is realized by setting the elastic modulus of the struc...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com