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Modeling and Analysis of Shear-critical ECC Members with Anisotropic Stress and Strain Fields

Benny Suryanto, Kohei Nagai and Koichi Maekawa

Journal of Advanced Concrete Technology, 8(2) 239-258, 2010

This paper describes an attempt to predict the response of shear-critical ECC members that exhibit strong anisotropic stress and strain fields. The ECC members investigated include pre-cracked ECC plates under stress field rotation, orthogonally-reinforced ECC (R/ECC) panel under pure shear, and shear-critical R/ECC beams under reversed cyclic loading. To achieve a simple yet accurate prediction, the mechanics of the ECC are represented by smeared models using a fixed crack approach. The applicability of these models is demonstrated through a simulation of ECC plates and R/ECC panel responses. This demonstrates the importance of an appropriate shear transfer model in representing essential behaviors of ECC in an anisotropic field. Predictions of these models were then compared against experimental results of shear-critical R/ECC beams with a M/Vd ratio of 1.0 and 0.5. For beams with a M/Vd ratio of 1.0, a good agreement is observed in terms of hysteretic response, crack pattern, and failure mechanisms. For beams with a 0.5 M/Vd ratio, the analysis somewhat underestimates the beam capacity, although it does predict a correct failure mechanism. Overall, this paper demonstrates that practical application of nonlinear finite-element analysis to ECC structural members is possible.

This paper describes the findings of a numerical study on the behavior of cracked R/ECC panels, focusing in particular on the shear transfer across the microcracks formed during material strain-hardening. †It is a detailed elegant study that sheds light on the structural response of this class of material and advances the basis of future structural design of this class of materials. (Prof. Victor Li, University of Michigan) Very detailed anyalysis with very strong numerical background.(Prof. Gyorgy L. Balazs, Budapest University of Technology and Economics )