（新疆大学建筑工程学院，乌鲁木齐 830001）

［摘要］土坯砌体应力-应变曲线峰后部分采用应变软化模型，基于Mohr-Coulomb强度准则，将黏聚力表征为等效塑性应变的分段线性函数，计算得出塑性阶段本构参数的演化，并利用ABAQUS软件对土坯砌体进行数值模拟得到荷载-位移曲线，模拟结果与试验数据吻合较好，表明所提出的分段线性本构模型较为合理。再将该模型应用到土坯房屋推覆试验的数值模拟中，发现其可较好地描述土坯砌体房屋静力推覆试验的峰后力学行为。

［关键词］Mohr-Coulomb本构；应变软化；数值模拟；土坯房屋

中图分类号：TU361文献标识码：A文章编号：1002-848X(2020)24-0124-05

Study on post-peak mechanical properties of adobe masonry based on Mohr-Coulomb model

ZHAO Zhiyue, AKENJIANG Tuohuti, YUAN Fang, LI Enhui

(Architectural Engineering College, Xinjiang University， Urumqi 830001, China)

Abstract:The strain-softening model was used in the post-peak part of the adobe masonry stress-strain curve. Based on the Mohr-Coulomb strength criterion, the cohesion was characterized as a piecewise linear function of equivalent plastic strain. The evolution of the constitutive parameters of the plastic stage was calculated, and the load-displacement curve was obtained by numerical simulation of the adobe masonry with ABAQUS software. The simulation results agree well with the experimental data, indicating that the proposed piecewise linear constitutive model is reasonable. Then the model was applied to the numerical simulation of the adobe shell push-over test. It is found that the post-peak mechanical behavior of the adobe masonry building static push test is well described.

Keywords:Mohr-Coulomb constitutive; strain-softening; numerical simulation; adobe building

*国家自然科学基金项目（51568064）。

作者简介：赵芝月，硕士，Email：303870864@qq.com；通信作者：阿肯江·托呼提，博士，教授，硕士生导师，Email: Akjt@xju.edu.cn。