【摘要】：應用連續(xù)介質(zhì)損傷力學和塑性流動理論,建立了基于能量耗散機制的塑性-損傷耦合模型。模型采用非關(guān)聯(lián)塑性流動法則描述混凝土不可恢復變形的演化。模擬剛度退化的損傷變量演化函數(shù)則通過斷裂能和應力-非彈性應變空間中的累積耗散能量建立�；谟邢拊绦駻BAQUS,推導了增量格式的材料雅可比矩陣,構(gòu)建了塑性-損傷模型的仿真分析程序。應用模型分析混凝土板平面內(nèi)雙軸受壓試驗、混凝土切口梁試驗和鋼筋混凝土梁受彎試驗,計算獲得的構(gòu)件響應與試驗結(jié)果吻合良好,能夠反映多軸應力狀態(tài)對混凝土抗壓強度的影響,也能準確模擬損傷導致的構(gòu)件非線性反應。
[Abstract]:Based on the damage mechanics and plastic flow theory of continuum, a plastic-damage coupling model based on energy dissipation mechanism is established. The uncorrelated plastic flow rule is used to describe the evolution of unrecoverable deformation of concrete. The evolution function of damage variables simulating stiffness degradation is established by fracture energy and cumulative dissipative energy in stress-inelastic strain space. Based on the finite element program ABAQUS, the Jacob matrix of incremental format is derived, and the simulation analysis program of plastic-damage model is constructed. The biaxial compression test, concrete notched beam test and reinforced concrete beam bending test in the plane of concrete slabs are analyzed by using the model. The calculated response of the members is in good agreement with the test results, which can reflect the influence of multi-axial stress state on the compressive strength of concrete, and can also accurately simulate the nonlinear response of members caused by damage.
【作者單位】： 重慶大學山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點實驗室;重慶大學土木工程學院;石河子大學水利建筑工程學院;
【基金】：國家自然科學基金項目(51578088) 新疆生產(chǎn)建設(shè)兵團博士基金項目(2012BB013)
【分類號】：TU528

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