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Nonlinear static analysis of an asphalt concrete core dam for comparison of three constitutive models

Hong Z., Hongyan Z., Jianke D.

Archives of Civil Engineering

2012

Vol. 58, nr 4

503-519

The goal of this work is to compare different constitutive models in the nonlinear static characteristic analysis of asphalt concrete core dams. The Duncan E- mi model, Duncan E-B model and double-yield-surface model are three major constitutive models in the nonlinear static prediction of earth-rockfill dam. In this paper, an earth-rock fill dam with asphalt concrete core-wall in an actual hydraulic engineering is employed to compare the three models. The finite element model of the core-wall dam is proposed. Nonlinear static analysis of the dam is carried out and the static characteristics are obtained to study the differences generated from different constitutive models. Numerical results show that both the stress extremum and the stress distribution of dam body with three different models are coincident one another. In the deformation analysis of dam body and core-wall, the maximum values of sedimentation with the Duncan E-mi model and the Duncan E-B model, which are greater than the value with double-yield-surface model, are close to the practical test data though the deformation distributions with three models are in good agreement. But, the analysis results of core-wall stress with double-yield-surface model are proper and more reasonable than the other models.

Unified strength theory for nonlinear analysis of steel structure

Hong Z., Mao-Hong Y.

Archives of Civil Engineering

2003

Vol. 49, nr 3

457-469

The elastoplastic constitutive model of the constructional steel is put forward, which is based on the Unified Strength Theory (UST) and can be used not only for steel with equal tensile-compression strength, but also for ones with different high tensile-compression strength. The material nonlinearity and geometrical nonlinearity FEM of updated Lagrangian (U.L.) mode based 8-node shell element is adopted to analyze the welded I shape beams under the cyclic loading. The accuracy of the constitutive model and the calculation programme is demonstrated by comparing the results of the calculation with experimental ones. The model and the computing programme are looking forward to analyzing the mechanical behavior and the destruction mechanism of the steel structures during an earthquake.

Proponuje się elasto-plastyczny model konstytutywny, oparty na Jednolitej Teorii Wytrzymałości (JST), który może być stosowany nie tylko do stali o jednakowej wytrzymałości na rozciąganie i ściskanie, lecz również do stali o różnej wytrzymałości na rozciąganie i ściskanie. Nieliniowy element skończony oparty na 8-węzłowym elemencie powłokowym został adoptowany do analizy spawanych belek dwuteowych pod obciążeniem cyklicznym. Dokładność modelu konstytutywnego i programu obliczeń jest wykazana przez porównanie wyników obliczeń i badań. Model i program komputerowy można będzie w przyszłości stosować do analizowania mechanicznych zachowań i mechanizmu zniszczenia konstrukcji stalowych podczas trzęsienia ziemi.