Structural damage detection and assessment using acceleration feedback

Abstract

This paper presents a method for structural health monitoring using acceleration measurements. In a previous study a method for detecting, locating, and quantifying structural damages has been developed by directly using the time domain structural vibration measurements. However, only displacement and velocity measurements were used in that study. In this paper, acceleration measurements are used as feedback. Because it is more practical to measure acceleration using accelerometers, it is preferable to use acceleration rather than displacement and velocity measurements for the purpose of structural damage detection and assessment. However, using acceleration measurements is more difficult since the effects of different damages can not be decoupled completely as in the cases of displacement and velocity measurements. One approach of circumventing this difficulty is presented and it involves increasing the order of time derivatives of the linear system. The effectiveness of the proposed method using acceleration feedback is evaluated with illustrative examples of a three and an eight-story model. Results obtained are found to be comparable with results from simulations using displacement measurements as feedback.

Adaptive structural control using global vibration sensing and model updating based on local infrared imaging

“…The global damage diagnosis algorithm presented in previous studies 11, 12, 18 uses one of the three kinds of measurements, displacements, velocities, or accelerations, as inputs. For the purpose of simplicity, displacement feedback is used in this study.…”

“…In order to develop an accurate structural model, it is necessary to determine the actual stiffness of connections in a structure. In previous studies 11, 12, joints were modeled as perfectly rigid and detecting changes in joint stiffness was not considered. Only changes in floor stiffness that occurred due to assumed damage to structural members were considered.…”

“…A global method for identifying and locating structural damage has been presented in previous studies 11, 12. The measured structural responses were assumed to be displacements, velocities, or accelerations.…”

Developing hybrid structural health monitoring via integrated global sensing and local infrared imaging

“…North-South component of the 1940 El Centro earthquake was used as excitation and structural responses measured were assumed to be accelerations at each floor, as reported in Smart Sensor and Smart Materials /NDE 2006. 10 Damages are modeled as percentage reductions in stiffness and are indicated by α i , where "i" is the floor number. For example, for the undamaged floor, α=0%.…”

“…The preliminary results on a three-story and an eight-story structure models were obtained and found to be comparable with results from using displacement feedback technique. 10 Further study has been done on the acceleration feedback algorithm and new results are described in this paper.…”