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Computational modeling of damage and...

Caner, Ferhun Cem.

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Computational modeling of damage and fracture in concrete.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Computational modeling of damage and fracture in concrete./
作者:	Caner, Ferhun Cem.
面頁冊數:	213 p.
附註:	Source: Dissertation Abstracts International, Volume: 61-11, Section: B, page: 6014.
Contained By:	Dissertation Abstracts International61-11B.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9994624
ISBN:	9780493019307

Computational modeling of damage and fracture in concrete.
Caner, Ferhun Cem.

Computational modeling of damage and fracture in concrete. - 213 p.

Source: Dissertation Abstracts International, Volume: 61-11, Section: B, page: 6014.

Thesis (Ph.D.)--Northwestern University, 2000.

The study presents a microplane-based constitutive model for concrete, called "M4" where the constitutive law is characterized as a relation between normal, volumetric, deviatoric and shear stresses and strains on variously oriented planes, called "microplanes". The microplane strain components are projections of the continuum strain tensor, and continuum stresses are obtained from the microplane stresses using the virtual work principle. An explicit numerical algorithm is formulated, its material parameters are calibrated and verified using the basic test data available in literature. Next, the model is extended to rate dependence. Two types of rate effect in nonlinear triaxial behavior of concrete are distinguished: (1) rate dependence of fracturing (microcrack growth) associated with activation energy of bond ruptures, (2) short-time creep (viscoelasticity). The main reason that (1) must be taken into account is to simulate a sudden reversal of post-peak strain softening into hardening with a sudden increase in rate of loading discovered recently. The rate dependence of initial and unloading stiffnesses requires (2) to be taken into account. The resulting model is suitable for finite element analysis of dynamic problems. Furthermore, the vertex effect on inelastic response is determined experimentally using state-of-the-art testing equipment. This effect is crucial in dynamics where load paths are often non-proportional. The experimental data obtained are simulated using finite element analyses with model M4 in both one and three dimensions, without recalibration. Furthermore, the three dimensional finite element analyses are repeated using an advanced fracture-plastic model calibrated to fit these particular data. Comparison of these results show that model M4 can simulate the vertex effects while the fracture-plastic models cannot. The physical reason behind the vertex effect is discussed. Finally, the critical reinforcement ratio required for concrete-filled tubular steel columns to achieve a ductile inelastic axial load-displacement response is determined using laboratory tests and their rigorous finite strain finite element simulations with model combined with a microplane model for steels.

ISBN: 9780493019307Subjects--Topical Terms:

783781
Engineering, Civil.

Computational modeling of damage and fracture in concrete.
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520 $a The study presents a microplane-based constitutive model for concrete, called "M4" where the constitutive law is characterized as a relation between normal, volumetric, deviatoric and shear stresses and strains on variously oriented planes, called "microplanes". The microplane strain components are projections of the continuum strain tensor, and continuum stresses are obtained from the microplane stresses using the virtual work principle. An explicit numerical algorithm is formulated, its material parameters are calibrated and verified using the basic test data available in literature. Next, the model is extended to rate dependence. Two types of rate effect in nonlinear triaxial behavior of concrete are distinguished: (1) rate dependence of fracturing (microcrack growth) associated with activation energy of bond ruptures, (2) short-time creep (viscoelasticity). The main reason that (1) must be taken into account is to simulate a sudden reversal of post-peak strain softening into hardening with a sudden increase in rate of loading discovered recently. The rate dependence of initial and unloading stiffnesses requires (2) to be taken into account. The resulting model is suitable for finite element analysis of dynamic problems. Furthermore, the vertex effect on inelastic response is determined experimentally using state-of-the-art testing equipment. This effect is crucial in dynamics where load paths are often non-proportional. The experimental data obtained are simulated using finite element analyses with model M4 in both one and three dimensions, without recalibration. Furthermore, the three dimensional finite element analyses are repeated using an advanced fracture-plastic model calibrated to fit these particular data. Comparison of these results show that model M4 can simulate the vertex effects while the fracture-plastic models cannot. The physical reason behind the vertex effect is discussed. Finally, the critical reinforcement ratio required for concrete-filled tubular steel columns to achieve a ductile inelastic axial load-displacement response is determined using laboratory tests and their rigorous finite strain finite element simulations with model combined with a microplane model for steels.
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