【摘要】：為了盡可能有效和準(zhǔn)確地描述混凝土材料的非線性力學(xué)特性,在研究國內(nèi)外混凝土損傷本構(gòu)模型的基礎(chǔ)上,基于連續(xù)介質(zhì)損傷力學(xué)和不可逆熱力學(xué)的理論框架,采用統(tǒng)一強度理論作為屈服破壞準(zhǔn)則,分別定義拉、壓雙標(biāo)量損傷來考慮材料的拉、壓迥異特性,同時引入反向加載影響因子以修正拉壓交替循環(huán)加載時材料的單邊效應(yīng),以及多軸應(yīng)力狀態(tài)下拉、壓損傷累積的相互影響,最終采用顯式積分算法建立了一種改進(jìn)的混凝土彈塑性損傷本構(gòu)模型.不同素混凝土加載試驗?zāi)M結(jié)果初步驗證了建議模型的有效性,而通過對含I型裂縫的混凝土簡支梁試驗進(jìn)行數(shù)值分析,結(jié)果表明,所得的荷載-撓度曲線與試驗結(jié)果吻合良好,進(jìn)一步檢驗了模型應(yīng)用于結(jié)構(gòu)非線性分析的有效性.
[Abstract]:In order to describe the nonlinear mechanical properties of concrete materials as effectively and accurately as possible, based on the theoretical framework of continuum damage mechanics and irreversible thermodynamics, the damage constitutive models of concrete at home and abroad are studied. The unified strength theory is used as the yield failure criterion, and the tensile and compression double scalar damage is defined to consider the different properties of the material, and the influence factor of reverse loading is introduced to correct the one-sided effect of the material under the alternate cyclic loading of tension and compression. Finally, an improved elastoplastic damage constitutive model of concrete is established by using explicit integral algorithm. The effectiveness of the proposed model is preliminarily verified by the simulation results of different plain concrete loading tests. The numerical analysis of simply supported concrete beams with I-type cracks shows that, The obtained load-deflection curves are in good agreement with the experimental results, which further verify the validity of the model applied to the nonlinear analysis of structures.
【作者單位】： 西北農(nóng)林科技大學(xué)水利與建筑工程學(xué)院;
【基金】：國家自然科學(xué)基金(面上項目)(51379178)~~
【分類號】：TU528

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