An Experimental Study of the Feasibility of Identifying the Impact Damages of Reinforced Concrete Piers Using a Modal Frequency Method

Zhou, Xiwu; Zhang, Wenchao; Gao, Yunan; Zhang, Guoxue; Wen, Mengdan

doi:10.1155/2020/6365354

Cited by 3 publications

(4 citation statements)

References 23 publications

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“…After pairing, mode shape pairs must be consistently normalized with the modal scale factor (MSF) [ 27 , 28 ]. The MSF measures the scale factor between two modes; thus, damaged modes can be scaled to undamaged ones by multiplying by the corresponding MSF using the following expressions:

where

is the modal scale factor between the i -th undamaged mode and j -th damaged mode.…”

Section: Damage Index From Mode Shape Curvaturesmentioning

confidence: 99%

Damage Detection in Steel–Concrete Composite Structures by Impact Hammer Modal Testing and Experimental Validation

Meruane

Yanez

Quinteros

et al. 2022

Sensors

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Steel–concrete composite systems are an efficient alternative to mid- and high-rise building structures because of their high strength-to-weight ratio when compared to traditional concrete or steel constructive systems. Nevertheless, composite structural systems are susceptible to damage due to, for example, deficient construction processes, errors in design and detailing, steel corrosion, and the drying shrinkage of concrete. As a consequence, the overall strength of the structure may be significantly decreased. In view of the relevance of this subject, the present paper addresses the damage detection problem in a steel–concrete composite structure with an impact-hammer-based modal testing procedure. The mathematical formulation adopted in this work allows for the identification of regions where stiffness varies with respect to an initial virgin state without the need for theoretical models of the undamaged structure (such as finite element models). Since mode shape curvatures change due to the loss of stiffness at the presence of cracks, a change in curvature was adopted as a criterion to quantify stiffness reduction. A stiffness variability index based on two-dimensional mode shape curvatures is generated for several points on the structure, resulting in a damage distribution pattern. Our numerical predictions were compared with experimentally measured data in a full-scale steel–concrete composite beam subjected to bending and were successfully validated. The present damage detection strategy provides further insight into the failure mechanisms of steel–concrete composite structures, and promotes the future development of safer and more reliable infrastructures.

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where

is the modal scale factor between the i -th undamaged mode and j -th damaged mode.…”

Section: Damage Index From Mode Shape Curvaturesmentioning

confidence: 99%

Damage Detection in Steel–Concrete Composite Structures by Impact Hammer Modal Testing and Experimental Validation

Meruane

Yanez

Quinteros

et al. 2022

Sensors

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“…Substituting the generic expression of mode shapes into the set of boundary conditions equation (7), the expressions of natural frequencies and mode shapes can be calculated [30]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…ese methods depend on the stiffness change on the influence of the dynamic characteristics of structure [6], which get the extensive attention of scholars because it is simple and easy. Common indicators include modal frequency [7], modal displacement [8], and the modal strain energy [9]. In view of the insufficient sensitivity of early damage identification indexes such as natural frequency and modal displacement, Pandey [10] firstly proposed a damage identification method for beam structure based on modal curvature (MC) in 1991, which has been widely applied and extended.…”

Section: Introductionmentioning

confidence: 99%

Damage Identification Method of Beam Structure Based on Modal Curvature Utility Information Entropy

Xiang

Zhou

et al. 2020

Advances in Civil Engineering

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Generally, the damage of the structure will lead to the discontinuity of the local mode shape, which can be well reflected by the modal curvature of the structure, and the local information entropy of the beam structure will also change with the discontinuity of the mode. In this paper, based on the information entropy theory and combining the advantages of modal curvature index in damage identification of beam structure, the modal curvature utility information entropy index is proposed. The modal curvature curves of nondestructive structures were obtained by fitting the modal curvature curves of damage structures with the gapped smoothing technique to avoid dependence on the baseline data of nondestructive structures. The index comprehensively reflects the damage state of the structure by calculating mutual weight change matrix and the weight-probability coefficient. The performance of the new index was verified by the finite element simulation and model test of simply supported beam, respectively. The results show that the modal curvature utility information entropy index takes advantage of the modal curvature index which is sensitive to damage and can overcome its shortcomings effectively. The index proposed can identify the damage location and damage degree accurately and has certain noise immunity, which provides an effective damage identification indicator for beam structures.

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“…Therefore, reasonable construction process monitoring is a crucial measure for improving construction quality, preventing construction errors, and ensuring the safety of bridge structures [2,15]. Presently, a variety of non-destructive testing techniques are available for structural damage monitoring [16,17]. Furthermore, the internal structure of the 0# block box girder of continuous rigid frame bridges is intricate, and it is firmly connected to the bridge piers, which places the 0# block box girder in a complex three-dimensional stress state.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Mechanical Properties of Polyester Fiber Concrete Continuous Rigid Frame Bridge during Construction

Miao,

Zhan,

Yuan

et al. 2023

Buildings

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This study investigates the mechanical performance of a polyester fiber concrete continuous rigid frame bridge during construction and the spatial stress distribution of the 0# block box girder, with a focus on the backdrop of the bridge in Pipa Zhou, Jiangxi Province. Stress monitoring at critical cross-sections during bridge construction was combined with FE simulations to analyze the stress and alignment deviation variations along the cantilevered construction process of the bridges. Subsequently, after validating the accuracy of the whole bridge model, the actual internal force of the box girder cross-section was extracted to act on the 0# block box girder solid model, and the spatial force of the 0# block box girder under the state of maximal cantilever and the completed bridge was further investigated. The results indicate that during cantilever construction, the top, and bottom plates of the box girder were subjected to compression, with the bottom plates having relatively low compression stress close to the critical values for compression and tension. Attention should be paid to controlling tensile stress application. After reaching a quarter of the bridge’s span in construction, the alignment deviation of the main beam increases, necessitating enhanced monitoring and adjustments of the main beam elevation. Furthermore, FE analysis shows that under maximum cantilever and the completed bridge states, the stress variations of the top and bottom plates of the 0# block box girder remain consistent, with the top plate stress varying by no more than 2.5 MPa and the bottom plate stress varying by approximately 1 MPa. Moreover, the 0# block box girder shrinkage cracks were mainly located in the bottom and web plate, and the number of cracks in the 0# block box girder with polyester fibers was reduced compared to the cracks in the ordinary concrete box girder.

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An Experimental Study of the Feasibility of Identifying the Impact Damages of Reinforced Concrete Piers Using a Modal Frequency Method

Cited by 3 publications

References 23 publications

Damage Detection in Steel–Concrete Composite Structures by Impact Hammer Modal Testing and Experimental Validation

Damage Detection in Steel–Concrete Composite Structures by Impact Hammer Modal Testing and Experimental Validation

Damage Identification Method of Beam Structure Based on Modal Curvature Utility Information Entropy

A Study of the Mechanical Properties of Polyester Fiber Concrete Continuous Rigid Frame Bridge during Construction

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