混凝土动静力破坏过程的数值模拟及细观力学分析-水工结构专业论文.docx

西安理工大学博士学位论文The 西安理工大学博士学位论文 The Numerical Simulation and Meso-mechanics analysis of the concrete damage process in the static and dynamic loads Specialty：Hydro-structure Engineering Date： 珈螂 Candidate= Zhou Shangzhi Signature： Supervisor： Chen Houqun Signature： Dang Faning Signature： ABSTRACT In this paper,Concrete is taken as three-phase composites consisting of aggregate，mortar and bond between aggregate and mortar based on meso-meehanics．皿e mechanical performance and failure process of concrete subjcoted to uniaxial compressive sffess and concrete sim#y supported beam in the static and dynamic load are studied by means of the software--ANSYS developed secondly．So the crack propagation，coalescence and failure of concrete is researched by the COnClete uniaxial compressive CT test Main work of this paper include： 1．Based On the given testing size，aggregate gradation，mix proportion，the number of each kind of aggregates is calculated in the concrete specimen．The random distribution of aggregate in specimen is generated by Monte-Carlo methed．3-D numerical model of the cylinder specimen of the concrete is established．The dynamic anlysis of numerical model of concrete specimen is ANSYS．The values of materials of aggregate，mortar and bond element are solved byusingprogramstudied。 2．The numerical model of the concrete cylinder and beam are established．11lc formation and propagation of the cracks are regarded as a continuous fatigue failure process and the failure process axe modeled by damage mechanics-finite‘element method．The different damage phases arc computed out and the mesh is refined．So the formation and propagation of the concrete cracks are investigated． 3．Based on the damage theory,the damage-failure process of concrete cylinder specimen under loading is studied t脚CT test．The results of numerical calculation is compared with that of CT experiment The formation and propagation of the concrete cracks as well as the failure mechanis