本文選題：混凝土　切入點(diǎn)：細(xì)觀尺度　出處：《計(jì)算力學(xué)學(xué)報(bào)》2015年03期 　論文類(lèi)型：期刊論文

【摘要】：實(shí)際工程結(jié)構(gòu)中混凝土材料大多處于雙軸或三軸的復(fù)雜應(yīng)力狀態(tài),已有的細(xì)觀力學(xué)數(shù)值研究工作大多針對(duì)單軸加載問(wèn)題,對(duì)于雙軸或者三軸加載條件下混凝土破壞模擬的研究相對(duì)較少。復(fù)雜受力條件下的混凝土材料破壞模擬中,細(xì)觀組分強(qiáng)度準(zhǔn)則選取的合理與否將成為混凝土破壞模式及宏觀力學(xué)性能數(shù)值研究準(zhǔn)確和成功與否的關(guān)鍵。本文旨在探討單軸強(qiáng)度準(zhǔn)則,如最大拉應(yīng)變準(zhǔn)則在多軸加載條件下混凝土破壞過(guò)程研究中運(yùn)用的合理性。鑒于此,首先在細(xì)觀尺度上建立了混凝土試件的二維隨機(jī)骨料模型,分別采用彈性損傷本構(gòu)關(guān)系模型及塑性損傷本構(gòu)關(guān)系模型來(lái)描述細(xì)觀組分(即砂漿基質(zhì))的力學(xué)性能,對(duì)雙軸加載條件下混凝土的細(xì)觀破壞過(guò)程進(jìn)行數(shù)值模擬,對(duì)比了單軸強(qiáng)度準(zhǔn)則和多軸強(qiáng)度準(zhǔn)則下混凝土試件破壞路徑及宏觀應(yīng)力-應(yīng)變關(guān)系的差異。數(shù)值結(jié)果表明,簡(jiǎn)單的單軸強(qiáng)度準(zhǔn)則難以反映雙軸加載下混凝土內(nèi)部應(yīng)力狀態(tài)的復(fù)雜性,不宜采用單軸強(qiáng)度準(zhǔn)則來(lái)描述多軸加載下混凝土的破壞行為。
[Abstract]:In practical engineering structures, the concrete materials are mostly in the complex stress state of biaxial or triaxial, and most of the existing meso-mechanical numerical researches are focused on uniaxial loading problems. The research on concrete failure simulation under biaxial or triaxial loading is relatively few. The selection of meso-component strength criterion will be the key to the accuracy and success of numerical study on failure mode and macroscopic mechanical properties of concrete. The purpose of this paper is to discuss the uniaxial strength criterion. For example, the application of the maximum tensile strain criterion in the study of concrete failure process under multiaxial loading is reasonable. In view of this, a two-dimensional random aggregate model of concrete specimens is established on a mesoscale scale. The elastic damage constitutive model and the plastic damage constitutive relation model are used to describe the mechanical properties of the meso-component (i.e. mortar matrix), and the meso-failure process of concrete under biaxial loading is numerically simulated. The difference of failure path and macroscopic stress-strain relationship of concrete specimens under uniaxial strength criterion and multiaxial strength criterion are compared. The numerical results show that, The simple uniaxial strength criterion can not reflect the complexity of internal stress state of concrete under biaxial loading, so it is not suitable to use uniaxial strength criterion to describe the failure behavior of concrete under multiaxial loading.
【作者單位】： 北京工業(yè)大學(xué)城市與工程安全減災(zāi)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家973計(jì)劃(2011CB013600) 國(guó)家自然科學(xué)基金重大項(xiàng)目(91215301) 北京工業(yè)大學(xué)博士創(chuàng)新基金(YB201207)資助項(xiàng)目
【分類(lèi)號(hào)】：TU528;O346

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本文編號(hào)：1572638