A Fuzzy Classification System for Evaluating the Health Condition of Marine Concrete Structures

Champiri, Masoud Dehghani; Mousavizadegan, S. Hossein; Moodi, Faramarz

doi:10.3151/jact.10.95

Cited by 20 publications

(10 citation statements)

References 11 publications

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“…It should be mentioned that due to accessibility issue, the DIC system was not used for specimen P4-025-FW, P4-040-FA, and P4-040-SB. The integrity of a structure is affected by the crack characteristics and therefore careful considerations should be made [39].…”

Section: Crack Characteristicsmentioning

confidence: 99%

Behavior of FRP-strengthened RC elements subjected to pure shear

Zomorodian

Yang

Belarbi

et al. 2018

Construction and Building Materials

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The shear behavior of fiber reinforced polymer strengthened reinforce concrete (FRP strengthened RC) has been the focus of extensive research studies. However, the mechanism of this complex phenomenon has not been fully clarified. Recent analytical models which were developed for predicting the shear capacity of FRP strengthened RC girders were based on test results of simply supported beam specimens with various shear span-to-depth ratios. In such tests no region of the specimen is subjected to uniform stress conditions, Therefore, the results of such tests cannot predict the true pure shear behavior due to non-uniformity of stresses, the presence of flexural and other non-shear related effects such as a/d ratio that cannot be filtered out. Therefore, proper design of shear strengthening using FRP requires testing of elements that are subjected to pure shear case primary before adding other governing effects. This allows a careful investigation and full understanding of the behavior at the element level. In order to accomplish this task, panel testing of representative RC specimens strengthened with FRP sheets were needed. This paper reports the testing of 10 FRP strengthened RC panels subjected to pure shear stress field. The tests were carried out to evaluate the effects of three variables: FRP stiffness, FRP wrapping scheme, and transverse steel reinforcement ratio. The test results showed that these three variables greatly affected the shear behavior due to various types of failure modes associated with FRP strengthening. In addition, it was observed that the magnitude of increased shear capacity associated with the application of FRP sheets depends not only upon the stiffness of FRP, but also on the stiffness of internal shear reinforcement. With the increase of internal steel shear reinforcement, the effectiveness of shear gain due to externally bonded FRP decreases.

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Section: Crack Characteristicsmentioning

confidence: 99%

Behavior of FRP-strengthened RC elements subjected to pure shear

Zomorodian

Yang

Belarbi

et al. 2018

Construction and Building Materials

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“…A remarkable feature that can be pointed out about post processing of digital image correlation system is their feasibility in being implemented in expert systems. Champiri et al [23,24]developed some expert systems for concrete structures and structural health monitoring with developing a fuzzy method. The parameter study is conducted in section 4 and the most efficient parameters are selected for performing different tests.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Damage-Plasticity Models in Capturing Compaction-Expansion Transition of Concrete Under Different Compression Loading Conditions

Mousavi¹,

Champiri²,

Willam³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. The pre-and post-peak performance features of two widely used damage-plasticity constitutive formulations are assessed for modeling the multiaxial response behavior of pressure sensitive quasi-brittle materials such as concrete. Two benchmark problems have been solved using commercial software packages; ABAQUS which implements the two invariant LeeFenves damaged plasticity formulation as its main feature for concrete has been used along with LS-DYNA which is using Duvaut-Lion damage and plasticity model, a three invariant formulation. In order to have consistent results, the parameter identification and calibration for both models has been performed and response of both models has been compared to each other under uniaxial tension and compression. The two benchmark problem are triaxial compression CTC and triaxial tension CTE. The aim of this study is to observe the difference between two well-known material models in capturing the compaction to extension regime in the yielded material. The difference between the response of each material model and also the efficiency of input parameters in controlling of this transition has been studied in this paper. Based on these failure diagnostics, the main shortcomings of each formulation are discussed and possible enhancements and remedies are proposed for the pre-and post-peak feature.

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“…[2,3,9,10]. The same method was also used to evaluate the damage incurred in concrete structures [11,12]…”

Section: Introductionmentioning

confidence: 99%

The Homogenization of a Masonry Unit Cell Using a Lattice Approach: Uniaxial Tension Case

Mohammadipour¹,

Willam²

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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This study provides an explanation on how a lattice model is employed in homogenizing a heterogeneous anisotropic masonry unit cell made of brick, mortar and their interface using energy equivalence concepts. The direct tension test was only considered in this study. Other loading scenarios like shear and compression may also be included using the same approach. The purpose is to obtain a post-peak scalar damage parameter of a homogenized isotropic finite element from the fracture energy results of a lattice masonry unit cell. A 2-D plane strain lattice formulation was implemented to evaluate energy release rate values of the masonry unit cell. Different strength failure criteria were assigned to brick, mortar, and interface strength material properties that were mapped on top of the mechanical model of the lattice according to their geometric locations. An energy method was subsequently employed to obtain the energy release rate of the lattice mesh as the crack propagates which was obtained by the change in the global stiffness matrix of the lattice approach before and after of strut removal. It was assumed that the total strain energy released in the lattice masonry unit cell in direct tension as the crack propagates equals the total strain energy dissipated in the equivalent homogenized isotropic continuum finite element under the same loading. Since these dissipated energy values correspond to the crack propagation and the damage incurred in the masonry unit cell, a scalar damage parameter can be defined based on the dissipated strain energy and energy release rate values during the analysis. The homogenization technique may be regarded as a bridge between the micro-scale lattice analysis and macro-scale masonry wall.

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A Fuzzy Classification System for Evaluating the Health Condition of Marine Concrete Structures

Cited by 20 publications

References 11 publications

Behavior of FRP-strengthened RC elements subjected to pure shear

Behavior of FRP-strengthened RC elements subjected to pure shear

Efficiency of Damage-Plasticity Models in Capturing Compaction-Expansion Transition of Concrete Under Different Compression Loading Conditions

The Homogenization of a Masonry Unit Cell Using a Lattice Approach: Uniaxial Tension Case

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