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陳松，柯敏勇，劉海祥，洪曉林
(南京水利科學(xué)研究院，南京210024)

[摘要] 提出了一種針對(duì)預(yù)應(yīng)力混凝土結(jié)構(gòu)分析的單元模型。通過(guò)自由度變換，把空間桿單元的節(jié)點(diǎn)自由度用實(shí)體單元的節(jié)點(diǎn)自由度來(lái)表示，使得單元網(wǎng)格劃分不必考慮預(yù)應(yīng)力鋼筋的方位，即桿單元的節(jié)點(diǎn)無(wú)須固定在實(shí)體單元節(jié)點(diǎn)上，共同模擬了預(yù)應(yīng)力混凝土結(jié)構(gòu)。采用單獨(dú)的空間桿單元模擬預(yù)應(yīng)力鋼筋，能直接求解預(yù)應(yīng)力對(duì)結(jié)構(gòu)產(chǎn)生的變形和內(nèi)力。應(yīng)用本文提出的單元信息生成技術(shù)，可方便地生成組合單元中的信息。實(shí)例驗(yàn)證分析表明，該模型方便可行，單元?jiǎng)澐中矢?，且能達(dá)到相當(dāng)?shù)木取?br /> [關(guān)鍵詞] 預(yù)應(yīng)力混凝土結(jié)構(gòu)；組合單元；自由度變換；空間桿單元

Combined finite element model of prestressed concrete structure and its mesh generation
Chen Song, Ke Minyong, Liu Haixiang, Hong Xiaolin
(Nanjing Hydraulic Research Institute, Nanjing 210029)

Abstract: A kind of element aiming at prestressed concrete structure analysis was proposed. By the method of transforming the node DOF of the space bar element to the node DOF of the space solid element, the position and direction of prestressed reinforced needn't be taken into account, that is, the node of bar element needn't be fixed on the node of space solid element. The prestressed concrete structure were simulated together. Independent space bar element was adopted to simulate prestressed reinforced, which can directly solve the displacement and internal forces of the structure by prestress. Using the technique of mesh generation, the information of element can be convenient to generate. It is shown that through prestressed concrete structure analysis by using this kind of element, the model is applicable and effective.
keywords: prestressed concrete structure;  combined finite element model;  mapping of freedom degree;  space bar element