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(同濟(jì)大學(xué)土木工程學(xué)院  上海 200092)

［提要］  結(jié)合再生混凝土框架結(jié)構(gòu)在低周反復(fù)荷載作用下的抗震性能試驗(yàn)，借助于已有的鋼筋混凝土非線性分析理論和有限元分析程序ANSYS，對(duì)再生混凝土框架結(jié)構(gòu)的受力性能進(jìn)行了非線性有限元分析。模擬計(jì)算和試驗(yàn)結(jié)果的比較表明，理論計(jì)算可以得到與實(shí)際試驗(yàn)較為吻合的結(jié)果，混凝土開(kāi)裂引起的結(jié)構(gòu)內(nèi)力重分布和組成材料的非線性性質(zhì)是結(jié)構(gòu)表現(xiàn)非線性性能的主要因素，用已有的鋼筋混凝土非線性有限元理論和ANSYS程序?qū)υ偕炷量蚣芙Y(jié)構(gòu)進(jìn)行受力分析是可行的。從ANSYS的模擬結(jié)果中，還可以分別獲得試驗(yàn)過(guò)程中難以直接得到的混凝土(特別是混凝土開(kāi)裂后)和鋼筋的應(yīng)力分布及其隨側(cè)向位移的變化曲線，模擬計(jì)算有助于更加深入地了解混凝土框架結(jié)構(gòu)內(nèi)部各組成部分之間的相互作用機(jī)理及其與結(jié)構(gòu)整體性能之間的關(guān)系，可以為結(jié)構(gòu)分析提供更為詳實(shí)的信息。

［關(guān)鍵詞］  再生混凝土  框架  受力性能  非線性有限元

Nonlinear Analysis on Mechanical Behavior of Recycled Concrete Frame/ Zhang Peng, Zhou Deyuan, Sun Yuedong, Xiao Jianzhuang (College of Civil Engineering, Tongji University, Shanghai 200092, China)

Abstract:On the basis of experimental study on seismic behaviors of recycled concrete frames under low reversed cyclic lateral loading, nonlinear finite element analysis method (FEA) has been applied to analyse seismic behaviors of recycled concrete frame via nonlinear analysis theory of reinforced concrete and ANSYS. Comparison between the results of calculations and experiments has revealed that theoretical calculations are consistent with trial results. It is cracks and nonlinear behaviors of compositive materials that lead to nonlinear behaviors of frames. In addition, quantities of information such as the changing distribution of stress of reinforcement and concrete, the changing curve of stress displacement, which cannot be derived from the test directly especially after the cracks occurred. Therefore, simulation can help to explore the reacting mechanical behaviors of different components in concrete frame and supply more detailed information. Comparison between the results of calculations and experiments has verified the feasibility and reliability of applying existing nonlinear finite element analysis method and ANSYS for the analysis of seismic behavior of recycled concrete frames.

Keywords:recycled concrete; frame; mechanical behaviors; nonlinear finite element method