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Plasticity model for concrete under triaxial compressions
Imran I.c, Pantazopoulou S.J.d
a ASCE, Indonesia
b ASCE, Indonesia
c Dept. of Civ. Engrg., Technol. Inst. of Bandung, Indonesia
d Dept. of Civ. Engrg., Demokritus Univ. of Thrace, Greece
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]Using the experimental background of 130 triaxial tests conducted on cylindrical specimens, a plasticity-based constitutive model of concrete behavior is developed. Parameters of the reference experimental database include the water:cement ratio (i.e., fc′), degree of saturation at testing, and load path used in the tests. In the model, damage is quantified by the volumetric expansion that builds up progressively in the material as it approaches failure and is caused by propagation of microcracks. This behavioral index is calibrated with reference to the available tests and subsequently used as the primary state variable in the model, determining for any stress state the degree of stiffness and strength degradation and the ductility in the response. Because failure is modeled as a damage-driven continuous process rather than a distinct event, the characteristic failure envelope is expanding (hardening) or contracting (softening) as a function of a scalar measure of plastic deformation. A nonassociated plastic flow rule calibrated against the experiments is used to describe the direction of plastic deformation. The model was tested against published triaxial test series and empirical confinement models. It was also used in the context of a finite-element formulation to study the mechanical behavior of reinforced-concrete circular columns. This particular test problem was selected because it is a real-life example of the experimental conditions used to derive the model.Using the experimental background of 130 triaxial tests conducted on cylindrical specimens, a plasticity-based constitutive model of concrete behavior is developed. Parameters of the reference experimental database include the water:cement ratio (i.e., fc′), degree of saturation at testing, and load path used in the tests. In the model, damage is quantified by the volumetric expansion that builds up progressively in the material as it approaches failure and is caused by propagation of microcracks. This behavioral index is calibrated with reference to the available tests and subsequently used as the primary state variable in the model, determining for any stress state the degree of stiffness and strength degradation and the ductility in the response. Because failure is modeled as a damage-driven continuous process rather than a distinct event, the characteristic failure envelope is expanding (hardening) or contracting (softening) as a function of a scalar measure of plastic deformation. A nonassociated plastic flow rule calibrated against the experiments is used to describe the direction of plastic deformation. The model was tested against published triaxial test series and empirical confinement models. It was also used in the context of a finite-element formulation to study the mechanical behavior of reinforced-concrete circular columns. This particular test problem was selected because it is a real-life example of the experimental conditions used to derive the model.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Plasticity-based constitutive models[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1061/(ASCE)0733-9399(2001)127:3(281)[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]