Abstract—Reliable design of reinforced concrete (RC) structures against earthquake has received considerable attention for many decades. It is vital that RC members exhibit sufficient strength and ductility under combinations of gravity loads and cyclic lateral excitations caused by earthquakes. To that end, this study presents an Enhanced Concrete Damage Plasticity Model (ECDPM) for predicting the cyclic behavior of plain concrete under multiaxial loading conditions, which combines the theories of classic plasticity and continuum damage mechanics. This model employs two damage variables for describing the influences of tensile and compressive damages on overall behavior. The capability of the model to predict the cyclic response of plain concrete is evaluated using experimental data from a uniaxial tension test, as well as uniaxial, biaxial and triaxial compression tests. Very good agreement is generally observed between the numerical predictions and test data. Various shortcomings of the model are also identified to aid future development efforts.