再生混凝土框架结构受力性能非线性分析

Nonlinear Analysis on Mechanical Behavior of Recycled Concrete Frame

结合再生混凝土框架结构在低周反复荷载作用下的抗震性能试验,借助于已有的钢筋混凝土非线性分析理论和有限元分析程序ANSYS,对再生混凝土框架结构的受力性能进行了非线性有限元分析。模拟计算和试验结果的比较表明,理论计算可以得到与实际试验较为吻合的结果,混凝土开裂引起的结构内力重分布和组成材料的非线性性质是结构表现非线性性能的主要因素,用已有的钢筋混凝土非线性有限元理论和ANSYS程序对再生混凝土框架结构进行受力分析是可行的。从ANSYS的模拟结果中,还可以分别获得试验过程中难以直接得到的混凝土(特别是混凝土开裂后)和钢筋的应力分布及其随侧向位移的变化曲线,模拟计算有助于更加深入地了解混凝土框架结构内部各组成部分之间的相互作用机理及其与结构整体性能之间的关系,可以为结构分析提供更为详实的信息。

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.