Thermal Crack Estimation of Dam Concrete Considering the Influence of Autogenous Shrinkage

Sato, Hiroji; Miyazawa, S.; Yatagai, Atsushi

doi:10.1061/9780784479346.153

Cited by 2 publications

(2 citation statements)

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“…Due to the difference in the workability of internal and external concrete, the types of these concretes are different. This difference can cause thermal strains and shrinkage between internal and external concretes (Sato et al, 2015). In fact, thermal cracks are generated due to hydration of various cement used in the dam body.…”

Section: Rcd Dams 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: Rcd Dams Introductionmentioning

confidence: 99%

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

Tavakoli

Mofid

Dehestani

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The overall stability of arch dams is analyzed by the three-dimensional numerical simulation [25]. Sato et al [26] simulated the thermal stress of a concrete dam by three-dimensional linear elastic FEM, and the autogenous shrinkage strain was added to the thermal strain. (2) Dam geomechanical model tests were widely carried out in the United States, Switzerland, Yugoslavia, Russia, Germany, Italy, Japan, and Sweden in the 1970s and 1980s [Error!…”

Section: Introductionmentioning

confidence: 99%

Cracking Risk and Overall Stability Analysis of Xulong High Arch Dam: A Case Study

et al. 2018

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It is of great significance to study the cracking risk, the overall stability, and the reinforcement measures of arch dams for ensuring long-term safety. In this study, the cracking types and factors of arch dams are summarized. By employing a nonlinear constitutive model relating to the yielding region, a fine three-dimensional finite element simulation of the Xulong arch dam is conducted. The results show that the dam cracking risk is localized around the outlets, the dam heel, and the left abutment. Five dam stress zones are proposed to analysis dam cracking state base of numerical results. It is recommended to use a shearing-resistance wall in the fault f57, replace the biotite enrichment zone with concrete and perform consolidation grouting or anchoring on the excavated exposed weak structural zone. Three safety factors of the Xulong arch dam are obtained, K_1 = 2~2.5; K_2 = 5; K_3 = 8.5, and the overall stability of the Xulong arch dam is guaranteed. This study demonstrates the significance of the cracking control of similar high arch dams.

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Thermal Crack Estimation of Dam Concrete Considering the Influence of Autogenous Shrinkage

Cited by 2 publications

References 1 publication

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

Cracking Risk and Overall Stability Analysis of Xulong High Arch Dam: A Case Study

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