砌体受压开裂过程数值模拟及其力学特性研究

为了研究砌体开裂过程的力学行为,提出利用现代计算机技术的数值试验方法,将砌体看成是由块体、砂浆和二者间的黏结带构成的三相复合材料,采用最大拉应力准则和摩尔库仑准则作为损伤本构关系的损伤阀值,建立砌体开裂数值模型,应用复合材料破裂过程数值分析系统MFPA2D(M aterial Failure Process A-nalysis),从应力场活动图像出发,模拟了砌体受压试件从损伤到开裂破坏的力学行为.研究表明,数值试验结果与试件物理实验结果较为吻合,为砌体开裂机理研究和发展、砌体力学性能研究提供了新的技术路径.

Numerical simulation of crack formation process and the mechanic characters of masonry structure

A numerical test approach that is based on the computer technology and the heterogeneous characteristic of masonry structure material is introduced and used to investigate the failure process of masonry structure.In this numerical model,the masonry is assumed to be a three-phase composite composed of block,mortar and felt-strip between them.And a newly developed numerical code MFPA~(2D)(Material Failure Process Analysis) is used to simulate the whole failure process from crack initiation to failure for the masonry structure under compressive forces,with the maximum tensile strain criterion and Mohr-coulomb criterion are utilized as damage threshold.Good agreement is achieved between the results obtained by numerical simulation and experiment.It provides a new technical way for the study and development of the masonry structure theory and the mechanic properties of the masonry.