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（新疆大學(xué)建筑工程學(xué)院，烏魯木齊 830001）

［摘要］土坯砌體應(yīng)力-應(yīng)變曲線峰后部分采用應(yīng)變軟化模型，基于Mohr-Coulomb強(qiáng)度準(zhǔn)則，將黏聚力表征為等效塑性應(yīng)變的分段線性函數(shù)，計(jì)算得出塑性階段本構(gòu)參數(shù)的演化，并利用ABAQUS軟件對(duì)土坯砌體進(jìn)行數(shù)值模擬得到荷載-位移曲線，模擬結(jié)果與試驗(yàn)數(shù)據(jù)吻合較好，表明所提出的分段線性本構(gòu)模型較為合理。再將該模型應(yīng)用到土坯房屋推覆試驗(yàn)的數(shù)值模擬中，發(fā)現(xiàn)其可較好地描述土坯砌體房屋靜力推覆試驗(yàn)的峰后力學(xué)行為。

［關(guān)鍵詞］Mohr-Coulomb本構(gòu)；應(yīng)變軟化；數(shù)值模擬；土坯房屋

中圖分類號(hào)：TU361文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*國(guó)家自然科學(xué)基金項(xiàng)目（51568064）。

作者簡(jiǎn)介：趙芝月，碩士，Email：303870864@qq.com；通信作者：阿肯江·托呼提，博士，教授，碩士生導(dǎo)師，Email: Akjt@xju.edu.cn。