Transactions of Nanjing University of Aeronautics & Astronautics
Mechanical Properties of CAC Under Biaxial Compression: A 3D Mesoscopic Study
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Abstract:
Studies on coral aggregate concrete （CAC） mainly focus on uniaxial stress conditions. However， concrete structures often experience complex stress conditions in practical engineering. It is essential to investigate the mechanical behavior and failure mechanisms of CAC under multiaxial stress conditions. This paper employs a 3D mesoscale model that considers the actual size， shape， and spatial distribution of aggregates. The reliability of the model and material parameters is verified through comparison with existing experimental data. Subsequently， the model is used to systematically study the mechanical properties， failure modes， and failure processes of C40 CAC under the biaxial compression. The numerical results are compared with the experimental results of CAC and ordinary portland concrete （OPC）. The results indicate that the failure modes of CAC under the biaxial compression are diagonal shear failure. The biaxial compressive strength and elastic modulus of CAC are greater than those under uniaxial stress and exhibit a significant intermediate principal stress effect. The biaxial compressive strength reaches its maximum value when the stress ratio is 0.5， which is consistent with the conclusions for OPC. Finally， failure criteria and strength envelopes for CAC under the biaxial compression are established in order to provide a reference for analyzing the strength characteristics and structural design of CAC.
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This work was supported by the National Science Foundations of China （Nos.52078250， 51878350， 11832013， 51678304， 51508272）.
Clc Number:
TU528
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