- 摘 要
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楊衛(wèi)忠1,2
(1 同濟(jì)大學(xué)，上海 200092；2 鄭州大學(xué)，鄭州 450002)[摘要] 通過一個細(xì)觀模型，從細(xì)觀層次上分析了砌體在單調(diào)受壓荷載作用下的損傷破壞機制，解釋砌體受壓應(yīng)力-應(yīng)變關(guān)系的非線性和應(yīng)變軟化，根據(jù)單元體平衡條件建立了砌體單調(diào)軸心受壓時的損傷本構(gòu)關(guān)系模型，基于細(xì)觀單元體強度分布特征確定損傷演化，利用應(yīng)力-應(yīng)變曲線特征條件和標(biāo)準(zhǔn)試件強度值確定模型參數(shù)，分析得出應(yīng)力-應(yīng)變關(guān)系僅與砌體的峰值點割線彈性模量與原點切線彈性模量有關(guān)，該式能反映砌體受壓試驗所表現(xiàn)的特征，與已有受壓結(jié)果吻合良好。
[關(guān)鍵詞] 砌體；本構(gòu)關(guān)系；損傷；受壓Constitutive relationslup model for masonry materials in compression
Yang Weizhong1,2
(1 Tongji University, Shanghai 200092, China; 2 ZhengZhou University, ZhengZhou 450002, China)Abstract: The masonry materials damage which has been caused by monotonic axial loading is analyzed from mesoscopic failure. The nonlinear performance of stress-strain curve of masonry is studied by using a class of meso-damage model. By using of the equilibrium of force, a damage constitutive model of masonry subjected to axial monotonic loading is established. The evaluation of damage is determined by strength distribution of the material, and the coefficients used in the model can be determined by the condition of the curve on the characteristic points. It is found that the stress-strain relationship can be uniquely determined by the scant shear modulus and tangent modulus. The relationship can also reflect all characteristics that shown in tests and has a good agreement with existed stress-strain curves.
Keywords: masonry; constitutive relationship; damage; compression
