HIGH-FIDELITY SIMULATIONS OF CONCRETE STRUCTURES WITH A MESH-SENSITIVITY MITIGATED CONSTITUTIVE MODEL

Terry Y.P. Yuen*, Chung Chan Hung, Hexin Zhang, Phu Anh Huy Pham, Tzu Han Wen, Yu Deng

*此作品的通信作者

研究成果: Conference contribution同行評審

摘要

High-fidelity, three-dimensional, and nonlinear finite element analysis (NLFEA) would be inevitable to reliably analyse and design unconventional and irregular concrete structures under extreme loading. The core of NLFEM is the constitutive modelling of materials. The existing constitutive models for concrete can be broadly classified as plasticity or phenomenological models. Nevertheless, many of those models could not resolve some critical concrete modelling issues that involve crack-induced anisotropy, change of stress transfer mechanisms under non-proportional loading, shear-slip and re-contact behaviour, mesh-size sensitivity, and balance between computational efficiency and modelling the detailed responses. To this end, this paper presents a robust and experimentally validated constitutive model that was developed recently. The key features of the model include (1) formulation with the total-strains and loading-history dependent internal variables, (2) cyclic normal and tangential stress-strain responses prescribed on crack planes, (3) fixed 3D crack plane coordinate that is uniquely determined by a novel crack plane searching algorithm, (4) multi-axial strain interaction modelled by the equivalent uniaxial-strains transformation method, (5) shear-slip and re-contact of the crack planes modelled by the modified shear retention model, and (6) mesh-size sensitivity mitigation through the model parameter regularisation. The proposed model was implemented into ABAQUS through the user-subroutine and successfully applied to simulate reserved-cyclic loading tests on a shear critical column and a high-strength squat RC wall. The proposed model can capture the damage evolutions and loss of axial and complete load-deflection hysteresis response of the tested column and wall. Hence, the proposed model could be a competent candidate for the high-fidelity nonlinear analysis of next generations of concrete structures that feature unconventional shapes.

原文English
主出版物標題Proceedings for the 6th fib International Congress, 2022- Concrete Innovation for Sustainability
編輯Stine Stokkeland, Henny Cathrine Braarud
發行者fib. The International Federation for Structural Concrete
頁面1750-1759
頁數10
ISBN(列印)9782940643158
出版狀態Published - 2022
事件6th fib International Congress on Concrete Innovation for Sustainability, 2022 - Oslo, 挪威
持續時間: 12 6月 202216 6月 2022

出版系列

名字fib Symposium
ISSN(列印)2617-4820

Conference

Conference6th fib International Congress on Concrete Innovation for Sustainability, 2022
國家/地區挪威
城市Oslo
期間12/06/2216/06/22

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