北京交通大学学报2013，Vol.37Issue(4)：84-88,5.
混凝土含损伤的摩尔-库伦强度模型试验研究
Experimental study on Mohr-Coulomb model with damage for concrete
摘要
Abstract
By using a true triaxial apparatus,static loading experiments were conducted on 100 mm ×100 mm × 100 mm cubic samples of concrete under plane strain condition.It is found that in the case of compression-shear failure,both peak strength and residual strength of concrete abide by MohrCoulomb criterion,and peak strength has greater internal friction angle and less cohesion value compared with residual strength.Further analysis obtained the following conclusions.The Shear bearing capacity of concrete is composed of internal friction and equivalent cohesion.During the loading at and after peak point,actual internal friction equals to the calculated value drawn from residual strength formula.Before reaching the peak point,actual internal friction is less than the value from the same formula.The equivalent cohesion of concrete decreases with increase of shear deformation,and so does it even in the loading process for measuring strength.We name a two axial mean stress (TAMS) to represent the average value of maximum principal stress σ1 and minimum principal stress σ3,and then Mohr-Coulomb strength criterion can be expressed as a linear relation between shearing strength and TAMS.There exists a critical value of TAMS corresponding to the intersection point of peak strength line and residual strength line.During the loading process,if TAMS remains constant and less than the critical value,there will be a declining section in shear stress and shear strain relation curve.On the contrary,if it remains constant and larger than the critical value,there will be no declining section in this curve.关键词
混凝土/摩尔-库伦强度准则/损伤/残余强度/平面应变Key words
concrete/ Mohr-Coulomb strength criterion/ damage/ residual strength/ plane strain分类
建筑与水利引用本文复制引用
王哲..混凝土含损伤的摩尔-库伦强度模型试验研究[J].北京交通大学学报,2013,37(4):84-88,5.基金项目
国家自然科学基金资助项目(51078024,51279003,50879004) （51078024,51279003,50879004）
