Harmonic thermal fracture of multiple crack system and the stability of cracks in RCC arch dam

Zhang, G.X.; Liu, G.T.; Wu, Yuanhao

doi:10.1016/0013-7944(95)00230-8

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…In several other studies in 1990, it was demonstrated that the majority of the concrete gravity dams experience cracking even under moderate earthquakes (Ingraffea, 1990;Rescher, 1990). Although many studies have been conducted on the behavior of cracked concrete dams against earthquakes (Arabshahi & Lot , 2008; Barpi Zhang et al, 1996;Zhu & Pekau, 2007), but there are limited studies on the behavior of RCD dams against thermal cracks. Whereas, RCD dams is widely used as a new method in the dam construction industry.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of thermal crack propagation in RCD dams considering rotational component of ground motion

Tavakoli

Mofid

Dehestani

2023

Preprint

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In design and construction of the Roller-Compacted Concrete dams (RCD) controlling of the thermal cracks is a significant matter. In the construction of RCD dams, two types of internal and external concrete are used; Thermal cracks are occurred due to hydration of various cements in this type of dams. Ignorance of this issue can lead to crack formation in the susceptible points of the dams and also propagation of the cracks during an earthquake is a threat to the stability and durability of the dam. In this research, the behavior of the thermal cracks existed in the RCD dam body, is investigated through translational and rotational components of the seismic ground motion. Three-dimensional finite element model of the concrete gravity dam is built in ABAQUS software, and the model was subjected to 7 near-field earthquake records. After validation of the model, the propagation of the thermal crack existed in the dam body is evaluated using fracture mechanics criterion (J-integral criterion). The results of the finite element analysis show that the existence of the thermal cracks in the susceptible points of the dam, leads to propagation of these cracks during an earthquake. Especially, with considering the rotational component of the ground motion which has the significant contribution in the obtained values of the crack propagation criterion; This contribution is related to the intensity and frequency content of the earthquake, which can lead to an increase of the crack propagation energy up to 50 percent in some earthquake records.

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Section: Introductionmentioning

confidence: 99%

Dynamic analysis of thermal crack propagation in RCD dams considering rotational component of ground motion

Tavakoli

Mofid

Dehestani

2023

Preprint

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show abstract

“…Zhang et al (1996) carried out thermal stress analysis for the investigation of cracks in a RCC arch dam. Their analyses showed that the stress distribution in the arch could be improved by artificial short joints located upstream of the abutment, and the water pressure should be kept constant during February-April for the consideration of stability of cracks.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional earthquake analysis of roller-compacted concrete dams

Kartal

2012

Nat. Hazards Earth Syst. Sci.

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Abstract. Ground motion effect on a roller-compacted concrete (RCC) dams in the earthquake zone should be taken into account for the most critical conditions. This study presents three-dimensional earthquake response of a RCC dam considering geometrical non-linearity. Besides, material and connection non-linearity are also taken into consideration in the time-history analyses. Bilinear and multilinear kinematic hardening material models are utilized in the materially non-linear analyses for concrete and foundation rock respectively. The contraction joints inside the dam blocks and dam-foundation-reservoir interaction are modeled by the contact elements. The hydrostatic and hydrodynamic pressures of the reservoir water are modeled with the fluid finite elements based on the Lagrangian approach. The gravity and hydrostatic pressure effects are employed as initial condition before the strong ground motion. In the earthquake analyses, viscous dampers are defined in the finite element model to represent infinite boundary conditions. According to numerical solutions, horizontal displacements increase under hydrodynamic pressure. Besides, those also increase in the materially non-linear analyses of the dam. In addition, while the principle stress components by the hydrodynamic pressure effect the reservoir water, those decrease in the materially non-linear time-history analyses.

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Simulation of hydraulic fracture utilizing numerical manifold method

Zhang

2015

Sci. China Technol. Sci.

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Harmonic thermal fracture of multiple crack system and the stability of cracks in RCC arch dam

Cited by 8 publications

References 7 publications

Dynamic analysis of thermal crack propagation in RCD dams considering rotational component of ground motion

Dynamic analysis of thermal crack propagation in RCD dams considering rotational component of ground motion

Three-dimensional earthquake analysis of roller-compacted concrete dams

Simulation of hydraulic fracture utilizing numerical manifold method

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