Abstract
The objective of this paper is to develop a tool for the numerical analysis of full-scale ECC structures. For this purpose, a macroscopic cyclic constitutive model for engineered cementitious composite (ECC) materials is developed based on the response of the material at the stress–strain level under different loading regimes. Various features specific to ECC material such as the unloading and reloading characteristics, different backbone curves in tension and compression, and residual strains are taken into account in the model development. The input parameters are limited to those that can be obtained from conventional monotonic compression and tension tests, thus facilitating its use with minimum information. The model is first validated at the stress–strain level and then implemented into fiber-based finite element analysis software for structural level simulation. The results from simulation of ECC members under cyclic and static time history loading are compared to experimental data for model validation at the structural level. Finally, a parametric study is conducted at the member level to investigate the effect of ECC tensile strength and ductility on the structural level response metrics: stiffness, strength, ductility, and energy dissipation capacity. It is observed that the structural level response metrics change considerably depending on the material properties. With its sensitivity to the main behavioral features of ECC, its simplicity, and its sufficient accuracy, the model is suited for use in predicting the behavior of ECC structures under monotonic, cyclic, and dynamic loading scenarios.
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Acknowledgments
This research was funded by the Mid-America Earthquake (MAE) Center. The MAE Center is a graduated National Science Foundation Engineering Research Center, which was funded under National Science Foundation Grant EEC-9701785. The funding for ECC member tests was provided by the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) facility in the Department of Civil and Environmental Engineering at the University of Illinois at Urbana-Champaign through the following grants by the National Science Foundation: CMMI-0927178 and CMMI-0530737. The stress–strain level test data was provided by Professor Sarah Billington and Dr. Hiroshi Fukuyama. The ECC columns were cast at Stanford University in collaboration with Professors Michael Lepech and Sarah Billington. The data from testing of ECC columns is used for structural level validation of the ECC constitutive model. The authors are thankful for the support of Professors Sarah Billington and Michael Lepech and Dr. Hiroshi Fukuyama.
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Gencturk, B., Elnashai, A.S. Numerical modeling and analysis of ECC structures. Mater Struct 46, 663–682 (2013). https://doi.org/10.1617/s11527-012-9924-0
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DOI: https://doi.org/10.1617/s11527-012-9924-0