Review on field monitoring of high‐rise structures

Su, Jiazhan; Xia, Yong; Weng, Shun

doi:10.1002/stc.2629

Cited by 41 publications

(24 citation statements)

References 124 publications

(219 reference statements)

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“…This range of change in resistance thus self explains the amount of damage done to the sample. The major damages thus can be sensed by the irreversible increase in the specimen resistivity, and the smaller damages can be sensed with the smaller reversible changes in the specimen resistivity as reported by Jiazhan et al 12 Chung. 19,28,34 Thus, avoiding the need for external sensors as the concrete in this case itself becomes a sensor.…”

Section: Frictional Changes In the Electrical Resistivitymentioning

confidence: 79%

“…However, at some instances, an increase in the electrical resistance has been observed within the elastic deformation phase itself. As reported by Jiazhan et al 12 and Chung, 19,28,34 a change in the resistance may be a contact resistivity change or a volume resistivity change. Both damage within the cement-based material and at an interface (e.g., between cement-based materials and steel rebar, or between old and new cement-based materials) can be sensed.…”

Section: Resistance Decrease With Increase In Loadmentioning

confidence: 82%

“…The stain sensing is the key component for the SHM of stress levels and deformation by these newly innovated smart technologies. 12,13 Abdel-Jaber and Glisic states in his study that the strain-based method for indirect monitoring of the prestressing force shows the most promising results due to the maturity of the sensing technologies and the well-established relationship between strain and stress. 14 The successful inclusion of high-conductive materials in cementitious composites for multifunctional purposes in recent times has led to these innovations in the infrastructural industry.…”

Section: Introductionmentioning

confidence: 99%

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Self‐damage sensing of electrically conductive self‐compacting concrete incorporating short carbon fibers

Gull

Tantray

2021

Struct Control Health Monit

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This study focused on the incorporation of pitch-based short carbon fibers in the self-compacting concrete (SCC) to obtain electrically conductive carbon fiber-based SCC (CFBSCC) composite. The dispersion of carbon fiber in the SCC was done utilizing a low-speed mechanical churner along with a surfactant. The ultimate goal was to impart the smart properties of carbon fiber into SCC to form electrically conductive CFBSCC which could sense its own stress, strain, or damage without using external sensors thereby developing a self-sensing concrete. The impact of the volume of carbon fibers on the compressive strength and electrical properties for 10 SCC mixes were investigated. The conductive CFBSCC was further investigated for its smart self-sensing behavior by correlating it with the piezoresistive properties. Test results showed that the incorporation of carbon fibers in SCC can improve its compressive strength properties and electrical conducting properties depending upon the percentage of carbon fibers employed. It was also found that the self-sensing ability can be developed in SCC using carbon fibers.

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Section: Frictional Changes In the Electrical Resistivitymentioning

confidence: 79%

Section: Resistance Decrease With Increase In Loadmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Self‐damage sensing of electrically conductive self‐compacting concrete incorporating short carbon fibers

Gull

Tantray

2021

Struct Control Health Monit

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“…Variations in temperature‐induced responses may mask the damage‐induced response, which eventually results in erroneous evaluations. In recent years, a large number of supertall structures have installed SHM systems for performance evaluation 6–11 . The periodic fluctuation of temperature is the direct cause of changes in structural strain and displacement.…”

Section: Introductionmentioning

confidence: 99%

Analytical calculation of temperature‐induced strain of supertall structures

Gao

Chen

Weng

et al. 2021

Structural Contr & Hlth

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Summary Estimating temperature‐induced strain is of critical importance for structural safety assessment. Most previous studies estimated the temperature‐induced strain by statistical analysis, resulting in the unexplainable physical meaning of the obtained model coefficients. In this paper, an analytical formula for the temperature‐induced strain of supertall structures is derived based on the simulated temperature field. First, a supertall structure is simplified as a cantilever column, and the theoretical relationship between the sectional two‐dimensional temperature field and strain is derived. Afterwards, the structure is extended to a generalised cantilever column bounded by springs at the top end, and the theoretical relationship of temperature and strain is derived as well. The formula shows that the sectional strain is composed of the sectional average temperature‐induced strain and the gradient temperature‐induced strain along two horizontal directions. A finite element (FE) model is established to verify the derived strain formula. Finally, the formula is applied to a real supertall structure, the Wuhan Yangtze River Navigation Centre, on which a long‐term structural health monitoring system has been installed. The temperature field of the whole structure is obtained by the FE heat transfer analysis, and the temperature‐induced strain is calculated according to the derived formula. The average difference between the theoretically derived and measured strains is less than 7 με. This study provides a simple theoretical formula for calculating the temperature‐induced strain of supertall structures, avoiding the complicated FE structural analysis.

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“…Studies of full‐scale tall buildings equipped with TLDs, however, are rare and have mostly focused on steel towers and tall buildings 11,14,16‐18 . Furthermore, Su et al 19 reviewed field monitoring of high‐rise structures and, in this review, reported studies of buildings equipped with TLDs are rare. In general, published studies of the full‐scale performance of vibration absorbers are very rare although absorbers are implementation worldwide 16,18 .…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of structural damping of a full‐scale building with and without tuned liquid dampers

Tarpø

Georgakis

Brandt

et al. 2020

Struct Control Health Monit

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Summary The theory of vibration absorbers is well established, but the literature lacks documentation of the actual performance of absorbers installed in tall buildings. This paper presents an experimental assessment of the dynamic characteristics of one of two identical high‐rise towers of the European Court of Justice in Luxembourg, before and after the activation of tuned liquid dampers, tuned to the frequency of the first mode. The prime focus of this assessment is structural damping and the effect that the tuned liquid dampers have on this. Two different full‐scale test methods were utilized: operational modal analysis, using ambient vibrations, and harmonic forced vibration tests using two centrifugal mass exciters. All three modes were excited at and around their natural frequencies of approximately 0.44, 0.57, and 0.82 Hz, respectively. To determine the damping, the free decays of the acceleration signals after shutting off the forces were studied. A clear and unambiguous increase in damping was found after the activation of the tuned liquid dampers, with damping increasing from 0.8% to 3.8% for the first mode. Also, the damping of the second mode was increased, although only from approximately 0.8% to 1%. The damping of the third torsional mode is approximately 0.6% and it is unaffected by the activation of the dampers. Thus, the tuned liquid dampers mainly affect the first mode as intended where the damping ratio increases with at least 500%. The results, finally, strongly suggest nonlinear behavior of the tuned liquid dampers, with higher damping at higher vibration levels.

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Review on field monitoring of high‐rise structures

Cited by 41 publications

References 124 publications

Self‐damage sensing of electrically conductive self‐compacting concrete incorporating short carbon fibers

Self‐damage sensing of electrically conductive self‐compacting concrete incorporating short carbon fibers

Analytical calculation of temperature‐induced strain of supertall structures

Experimental determination of structural damping of a full‐scale building with and without tuned liquid dampers

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