Anchor Tension Testing via Dynamic Impulse Response
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Solution Overview
Problem
There is a lack of practical, non-destructive methods for assessing the tension value of multiple-strand anchors embedded in concrete dams, particularly those that are not retensionable, due to issues like corrosion and relaxation, which complicates repair, replacement, or retensioning without damaging the dam.
Innovation Solution
A method involving empirical dynamic impulse response analysis is used to determine the tension of anchors by isolating the dynamic behavior of the anchors within the dam's impulse response, comparing it to modeled responses at different tension values, and selecting the closest match to determine the tension value without causing damage to the dam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional destructive testing methods are used to assess anchor tension, then measurement accuracy is improved, but damage is caused to the dam structure
Solution Approach 1:
The patent applies mechanical vibration by exciting the dam structure with controlled vibrations and measuring the resonant frequencies. The vibration data is then correlated to anchor tension levels, allowing non-destructive assessment of anchor conditions while maintaining structural integrity.
Solution Approach 2:
The patent replaces traditional mechanical destructive testing methods with a dynamic analysis approach using vibration measurements and frequency domain analysis. This substitution allows tension assessment through mathematical modeling rather than physical destruction of test specimens.
2Measurement precision
If multiple anchors are tested individually using conventional methods, then measurement precision is improved, but testing time and complexity increase significantly
Solution Approach 1:
The patent merges the testing of multiple anchors into a single integrated dynamic analysis process. By exciting the entire dam structure and analyzing the combined vibration response, the system can assess multiple anchors simultaneously through pattern recognition and frequency analysis, dramatically reducing testing time while maintaining precision.
Solution Approach 2:
The patent creates a universal testing methodology that can assess multiple anchors of different types and locations using the same vibration-based approach. The dynamic analysis framework is adaptable to various anchor configurations, allowing a single system to perform multiple assessment functions efficiently.
3Reliability
If retensionable anchors are used to allow periodic measurement and retensioning, then anchor condition monitoring is improved, but corrosion and relaxation issues worsen
Solution Approach 1:
The patent enables anchors to effectively self-diagnose their tension status through the dam's vibration response. The dynamic analysis system detects tension variations and relaxation conditions without requiring active intervention or retensioning operations, allowing anchors to monitor their own condition passively.
Solution Approach 2:
The patent performs preliminary assessment of anchor tension conditions through vibration analysis before significant corrosion or relaxation damage occurs. By detecting early signs of tension loss, the system enables proactive maintenance planning and prevents progressive deterioration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for the determination of anchor tension without damaging the dam, enabling effective repair, replacement, or retensioning of anchors, and can be applied to multiple anchors simultaneously.
Implementation Method 1
an empirical dynamic impulse response of the dam is empirically obtained such that a portion of the dynamic impulse response is dominated by a dynamic behavior of the anchor
Data Source
AI summary
Systems and methods of determining a tension of an anchor embedded in a dam are described. A dynamic impulse response of the dam is empirically obtained in such that a portion of the empirical dynamic impulse response is dominated by a dynamic behavior of the anchor. Furthermore, a set of modeled impulse responses that map to a set of tension values for the anchor are obtained. Next, a closest matching modeled impulse response from the set of modeled impulse responses that is a closest match to the portion of the empirical dynamic impulse response that is dominated by the dynamic behavior of the anchor is determined. Finally, a tension value from the set of tension values is selected, which is the closest match to the portion of the dynamic impulse response dominated by the dynamic behavior of the anchor. As such, the tension value of the anchor can be determined.