Relative Displacement Sensing Techniques for Postevent Structural Damage Assessment: Review

Li, Honghao; Dong, Suyang; El‐Tawil, Sherif; Kamat, Vineet R.

doi:10.1061/(asce)st.1943-541x.0000729

Cited by 20 publications

(12 citation statements)

References 65 publications

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“…Geodetic monitoring of displacements of damaged buildings is often the most effective method of investigating the causes of their cracks and failures [1][2][3]. This approach can give satisfactory results also in the case of damage having a geotechnical background.…”

Section: Introductionmentioning

confidence: 99%

Displacements of Object Founded on Expansive Soils—A Case Study of Light Construction

et al. 2020

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The paper presents results of observations of a light structure damaged by irregular vertical and horizontal deformations on Neogene expansive clays, typical for area in Central Poland. The sensitivity to environmental changes of humidity in such subsoils can activate volume changes, which causes the destruction of many objects susceptible to deformation. Detailed geotechnical investigations, including seasonal fluctuations of natural moisture content, were carried out for over a year, describing the dynamism of conditions of clays in the foundation zone. Parallel geodetic measurements of vertical and horizontal displacements were carried out, using classical precision leveling and the coordinate method of the Leica TDRA 6000 laser station. The network of measurement points has been specially designed and implemented to follow the spatial displacements of the structure. The network points were placed at the bottom of pillars and on the flooring of the structure located in the upper part. In the paper, the results of the vertical and horizontal periodical measurement of displacements of an investigated construction over the year were discussed to identify the main factors influencing the mechanism of damage of the observed structure.

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Section: Introductionmentioning

confidence: 99%

Displacements of Object Founded on Expansive Soils—A Case Study of Light Construction

et al. 2020

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“…A feature point-matching algorithm was used to recognize ceiling objects and calculate the relative movement between the ceiling and floor. A more comprehensive collection of different kinds of technologies used in relative displacement monitoring is presented in two literature reviews [11,18]. However, the above methods have disadvantages.…”

Section: Introductionmentioning

confidence: 99%

A Method of Interstory Drift Monitoring Using a Smartphone and a Laser Device

Xie

Zhao

2020

Sensors

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Interstory drift is an important engineering parameter in building design and building structural health monitoring. However, many problems exist in current interstory drift monitoring methods. The traditional method is imprecise—double numerical integration of acceleration data—and other direct monitoring methods need professional equipment. This paper proposes a method to solve these problems by monitoring the interstory drift with a smartphone and a laser device. In this method, a laser device is installed on the ceiling while a smartphone is fixed on a steel projection plate on the floor. Compared with a reference sensor, the method designed in this study shows that a smartphone is competent in monitoring the interstory drift. This method utilizes a smartphone application (APP) named D-Viewer to implement monitoring and data storage just in one place, which is also inexpensive. The results showed that this method has an average percent error of 3.37%, with a standard deviation of 2.67%. With the popularization of the smartphone, this method is promising in acquiring large amounts of data, which will be significant for building assessment after an earthquake.

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“…The premise of this paper is that appropriately identified and processed acceleration data could be used to assess structural damage in the aftermath of an earthquake. In particular, the acceleration data can be integrated twice to yield floor displacements, which can be further processed to get interstory drift ratios along the building height (Li et al). Comparing interstory drift ratio to well‐known limits (eg, in FEMA 350 (2000)) can provide insight into the damage that the building has experienced.…”

Section: Motivation and Introductionmentioning

confidence: 99%

Dynamic behavior of a smart device on a surface subjected to earthquake motion

El‐Tawil

Ibrahim

2018

Earthq Engng Struct Dyn

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Summary This paper leverages concepts from an existing model to simulate the planar response of a smart device subjected to friction forces induced by an underlying moving plane. An interpolation technique is used to enhance detection of transition points (between sticking and sliding states), which must be accurately identified because of the frequency of their occurrence during seismic motion. The behavior of a smart device on an unconstrained table or desk, which is itself on a moving floor, is introduced and discussed. After validation of the results using experimental data, the revised model is used to study the sliding potential of smart devices on a surface during strong seismic events. Sliding spectra associated with selected ground motions are presented and extended to incorporate the effect of vertical accelerations with the purpose of assessing their influence. It is shown that vertical accelerations have a minimal effect on the sliding behavior of smart devices and that a “probability of exceeding the slip limit” curve can be developed to relate the probability of sticking to a demand parameter that represents the ground motion.

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Relative Displacement Sensing Techniques for Postevent Structural Damage Assessment: Review

Cited by 20 publications

References 65 publications

Displacements of Object Founded on Expansive Soils—A Case Study of Light Construction

Displacements of Object Founded on Expansive Soils—A Case Study of Light Construction

A Method of Interstory Drift Monitoring Using a Smartphone and a Laser Device

Dynamic behavior of a smart device on a surface subjected to earthquake motion

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