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陸新征  江見(jiàn)鯨    (清華大學(xué)土木工程系  北京100084)

[提要]  在有限元軟件ANSYS中為混凝土材料專門定義了一種單元：Solid 65。它預(yù)先定義好混凝土的破壞準(zhǔn)則，可以模擬混凝土材料特有的開(kāi)裂、壓碎等力學(xué)現(xiàn)象。通過(guò)4個(gè)科研項(xiàng)目實(shí)例，介紹了Solid 65單元在框架、疊合梁、約束混凝土柱、組合結(jié)構(gòu)節(jié)點(diǎn)等問(wèn)題中的應(yīng)用。討論了Solid 65單元和鋼筋、型鋼、鋼管、碳纖維等不同材料組合工作時(shí)建模方法及相互連接的處理。并對(duì)+些常見(jiàn)錯(cuò)誤進(jìn)行歸類分析，提出了解決方法。
[關(guān)鍵詞]  有限元  混凝土  ANSYS非線性分析  本構(gòu)模型  鋼筋模型

In the FEA software of ANSYS,an element type of“Solid 65”is defined for concrete material specially. It includes the failure criteria of concrete and can simulate the typical mechanics behavior of concrete such as crack and crush. According to the research work, the applications of Solid 65 in frame structure, composite beam, confined column and joint of composite structure are presented together with 4 practical examples. And the methods to set up the connection between concrete and other materials are discussed in details, when the concrete is working together with other materials such as rebar, section steel, steel tube and carbon fiber. The typical mistakes on using¨Solid 65”are classified and advices are given to avoid them.
Keywords: FEA; concrete; ANSYS; nonlinear analysis; constitutive model; rebar model