随机骨料增强混凝土的弹性模量计算分析

采用AUTOCAD几何建模与ANSYS有限元分析相结合的方法,利用平均应力-应变法、广义虎克定律、能量法、均质化法等不同的计算方法,从细观数值模拟的角度分析骨料倾斜角度、骨料百分比以及骨料形状的任意性对随机骨料增强混凝土弹性模量的影响,比较了不同计算方法所得结果的差异,结果表明:形状相同的骨料,排列方式和体积比具有显著影响;形状不同的骨料,加载方向有一定的影响;平均应力-应变法和能量法过高估算有效力学性能,均质化法和广义虎克定律预测的有效弹性模量较为实用和可靠。

ANALYSIS OF THE INFLUENCE OF GEOMETRIC CHARACTERISTIC OF RANDOM AGGREGATES ON EFFECTIVE ELASTIC MODULUS FOR CONCRETE MATERIALS

By combining the AUTOCAD method to constitute the geometrical model and the ANSYS platform to perform the finite element analysis in this paper,the effective elastic modulus is calculated by the methods of average stress-strain,generalized Hooke's law,energy method and the homogenization method.The influence of the inclination angle of aggregate,the percentage of aggregate and the arbitrariness of aggregate shape on the elastic modulus of concrete reinforced concrete is analyzed from the angle of mesoscopic numerical simulation.The difference of the results obtained by different calculation methods is compared.The results from different methods are compared and analyzed,which show that the array methods have an obvious influence on the effective elastic modulus for the aggregates with the same shapes and volume fraction.The effective elastic modulus has great differences with the changes of volume fractions for the aggregates with shapes of the curving,agglomerating,kinking and winding under different loading direction.The average stress-strain theory and the energy methods have over-estimated the effective mechanical properties,and the results from the general Hooke's law and homogenization methods are relatively practical and reliable.