Simulation of Cracking in Large Arch Dam: Part II

Linsbauer, H. N.; Ingraffea, A.R.; Roßmanith, H. P.; Wawrzynek, Paul A.

doi:10.1061/(asce)0733-9445(1989)115:7(1616)

Cited by 36 publications

(18 citation statements)

References 3 publications

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“…the second-order fabric tensor employed in this chapter, furnishes a much more essential characterization of distributed micro-defects than does a phenomenological damage variable, especially in jointed rock masses. Starting from it, a one-parameter damagedependent elasticity tensor is developed based on tensorial algebra and ther- 23. Normal forces in shotcrete lining modynamics requirements; a conjugate-force-based anisotropic damage evolution law is deduced within the framework of Rice's [32] "normality structure".…”

Section: Resultsmentioning

confidence: 99%

Damage mechanics of jointed rock in tunnelling

Yang

Swoboda

Zhao

et al. 2003

Numerical Simulation in Tunnelling

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Abstract. In this chapter, an anisotropic damage model is established in strain space to describe the behavior of jointed rock masses under compression-dominated stress fields. The research work focuses on rate-independent and small-deformation behavior during isothermal processes. It is emphasized that the damage variables should be defined microstructurally rather than phenomenologically for jointed rock masses, and a second-order "fabric tensor" is chosen as the damage variable. Starting from it, a one-parameter damage-dependent elasticity tensor is deduced based on tensorial algebra and thermodynamic requirements; An equivalent state is developed to exclude the macroscopic stress/strain explicitly from the relevant constitutive equations. Finally, some numerical results are worked out to illustrate the mechanical behavior of this model. In order to eliminate the complexity and arbitrariness in. the formulation of phenomenological anisotropic model, systematic micromechanical analysis has been done on damage elasticity, damage evolution laws and micromechanics of different types of microdefects.

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Section: Resultsmentioning

confidence: 99%

Damage mechanics of jointed rock in tunnelling

Yang

Swoboda

Zhao

et al. 2003

Numerical Simulation in Tunnelling

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“…Worst of all, the macrocracks will occur, and some of them will continue to expand and eventually form the penetrating cracks when the stress exceeds the tensile strength of concrete. And these penetrating cracks destroy the integrity of concrete structures and even become the potential hazards of the concrete constructions [3]. e changes of concrete temperature must be paid great attention in the design and construction process [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study on Adiabatic Temperature Rise Reflecting Hydration Degree of Concrete

Wang

et al. 2018

Advances in Materials Science and Engineering

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e thermal model and the relevant parameters of concrete are the most important issues to study the space-time characteristics of temperature field, which are also the theoretical foundation of temperature control and crack prevention for the mass concrete structures. In this research, the improved adiabatic temperature rise test is carried out, and the temperature variation of fly ash concrete is analyzed. Furthermore, a thermal model of concrete considering the hydration degree is established based on the existing achievements. Meanwhile, the thermal conductivity and specific heat of concrete are measured via three approaches: by treating the parameters as constant values, by computing the parameters as variables of the degree of hydration, and by backanalyzing the parameters through BP neural network. Finally, the thermal parameters determined by different methodologies are substituted into the thermal model, respectively, and the finite element analysis of the concrete specimen is performed. By comparing simulated temperatures with various measured results, it can be found that the numerical analysis results of parameters calculated by BP neural network are closest to the measured values in the whole curing ages. erefore, BP neural network method is an effective way to calculate the thermal parameters, and BP inversion algorithm provides a new way for accurately study the temperature profile of mass concrete structures.

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“…However, most of the simulation works consider concrete arch dam to behave elastically, and consequently the cracking behavior and failure 2 Mathematical Problems in Engineering mode of concrete arch dam cannot be captured. Limited studies on the cracking behavior of concrete arch dam can be found in [9,10] in which the rock foundation is assumed to be rigid and in [11,12] in which the concrete arch dam is treated as a crown cantilever and is analyzed using the linear elastic fracture mechanics method. Moreover, to the best of our knowledge, the study on the influence of the ratio of mechanical properties of weak abutment and those of strong abutment on the cracking behavior and failure mode, which can provide an extensive knowledge of the structural failure of the concrete arch dam with nonuniform abutment in a general sense, has been rarely detailed in past research works.…”

Section: Introductionmentioning

confidence: 99%

Cracking Behavior of a Concrete Arch Dam with Weak Upper Abutment

Jing

Liu³

et al. 2017

Mathematical Problems in Engineering

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The cracking behavior and failure mode of a 78 m high concrete double-curvature arch dam with weak upper abutment are investigated through performing cracking analysis. The mechanical behavior of concrete is simulated using a smeared crack model, in which a combination of the compression yield surface and the crack detection surface with a damaged elasticity concept is employed to describe the failure of concrete. The arch dam with practical mechanical properties of the upper and lower abutments is firstly studied with emphasis on its cracking behavior during overloading. Then, a comprehensive sensitivity analysis is carried out to investigate the influence of the ratio of the mechanical properties of upper abutment to those of lower abutment on dam failure with prime attention placed on the failure mode. Simulation results indicate the adopted smeared crack model is well-suited to the crack analysis of concrete arch dam. It is shown that cracking is localized around the interface between upper and lower abutments, which leads to a fast crack growth in the through-thickness direction of dam and finally causes the dam failure. Furthermore, the sensitivity analysis presents three types of failure modes corresponding to different ratio value, wherein Modes II and III should be avoided since the weak upper abutment plays a predominant role in the cracking and failure of concrete arch dam.

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Simulation of Cracking in Large Arch Dam: Part II

Cited by 36 publications

References 3 publications

Damage mechanics of jointed rock in tunnelling

Damage mechanics of jointed rock in tunnelling

Study on Adiabatic Temperature Rise Reflecting Hydration Degree of Concrete

Cracking Behavior of a Concrete Arch Dam with Weak Upper Abutment

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