| As a typical inhomogeneous composite material, there are a lot of porosity in concrete,the concrete material has certain moisture content when it was in nature or working under thewater environment. The existence of the pore water will lead to concrete material mechanicschange. The paper was made to predict the concrete mechanic proporties effect of porosityand pore water based on Micromechanics.The main content and conclusions are as following:(1) Supposeing that the concrete is composed by two phase which are matrix and pore.Using the theory of inclusion and mesoscopic Mori-Tanaka method to establish the crack andhole volume fraction and concrete effective elastic modulus calculation formula between ofdifferent porosity and saturated cases concrete macro elastic modulus to forecast. The resultsshow that, with the increase of porosity, concrete of the effective elastic modulus graduallyreduced, along with the increase of saturation, concrete effective elastic modulus increase.(2) By using finite element software ADINA model of concrete, a different porosity andpore porosity of the same situation different diameter concrete effective elastic modulusnumerical calculation model was created. Analysis show that with the increase of porosity,concrete macro effective elastic modulus gradually decrease, in the same porosity case, whichthe pore diameter is1mm,2mm and3mm,with the increase of pore diameter, concreteeffective elastic modulus increase.(3) The function of ADINA fluid-structure coupling was used to establish concrete andpore water of fluid-structure coupling calculating model to analyse how the concretesaturation effective elastic modulus change in different porosity and different saturation.Through the comparative analysis with drying condition in the same porosity, we find that inthe pore water saturated condition, the effective elastic modulus is higher than under the samecondition which is in the dry condition. |
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