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An enhanced damage plasticity model for predicting the cyclic behavior of plain concrete under multiaxial loading conditions

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Frontiers of Structural and Civil Engineering 2020年第6期14卷 1531-1544页

作者： Mohammad Reza AZADI KAKAVAND Ertugrul TACIROGLU Unit of Strength of Materials and Structural Analysis Institute of Basic Sciences in Engineering SciencesUniversity of InnsbruckInnsbruck 6020Austria Department of Civil&Environmental Engineering University ofCaliforniaLos AngelesCA 90095USA

Some of the current concrete damage plasticity models in the literature employ a single damage variable for both the tension and compression regimes,while a few more advanced models employ two damage *** with a single variable have an inherent dificulty in accounting for the damage accrued due to tensile and compressive actions in appropriately different manners,and their mutual *** the current models that adopt two damage variables,the independence of these damage variables during cyclic loading results in the failure to capture the effects of tensile damage on the compressive behavior of concrete and *** study presents a cyclic model established by extending an existing monotonic constitutive *** model describes the cyclic behavior of concrete under multiaxial loading conditions and considers the influence of tensile/compressive damage on the compressive/tensile *** proposed model,dubbed the enhanced concrete damage plasticity model(ECDPM),is an extension of an existing model that combines the theories of classical plasticity and continuum damage *** most prior studies on models in the same category,the performance of the proposed ECDPM is evaluated using experimental data on concrete specimens at the material level obtained under cyclic multiaxial loading conditions including uniaxial tension and confined *** performance of the model is observed to be ***,the superiority of ECDPM over three previously proposed constitutive models is demonstrated through comparisons with the results of a uniaxial tension-compression test and a virtual test.

关键词： damage plasticity model plain concrete cyclic loading multiaxial loading conditions

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Determination of the Cement Sheath Interface and the Causes of Failure in the Completion Stage of Gas Wells

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1719-1735页

作者： Xuesong Xing Renjun Xie Yi Wu Zhiqiang Wu Huanqiang Yang CNOOC Research Institute Beijing100027China Yangtze University Wuhan430100China

The bonding quality of the cement sheath interface decreases during well completion because of the change in the casing *** explore the root cause of such phenomena,experiments on the mechanical properties and interface bonding strength of a cement sheath have been carried out taking the LS25-1 high-temperature and high-pressure(HTHP)gas field as an ***,a constitutive model of the cement sheath has been defined and verified both by means of a full-scale HTHP cement sheath sealing integrity evaluation experiment and three-dimensional finite element *** results show that the low initial cementing surface strength is the root cause of cement sheath interface bonding *** the pressure in the casing exceeds a certain limit,the stress caused by the change in the internal pressure in the casing is transmitted to the cement sheath,resulting in the degradation of the interface stiffness of the cement ***,with an increase in the casing wall thickness,the stress transmission capacity ***,it is concluded that improving the interfacial cementing strength,appropriately increasing the casing wall thickness and increasing the initial stress of the cement sheath are the keys to ensuring the sealing integrity of the cement sheath in high-temperature and high-pressure gas wells.

关键词： Gas well completion cement sheath sealing failure interfacial bonding strength damage plasticity model

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