【摘要】 罕遇地震作用下结构和构件进入塑性阶段而会发生弹塑性损伤,正确的模拟结构进入非线性状态后的力学行为对评价结构的抗震安全性具有重要的意义。该文采用纤维单元及多弹簧单元等宏观单元对CFRP混凝土构件、预应力混凝土梁及剪力墙进行构件弹塑性分析,并与试验结果进行对比,表明宏观单元对混凝土构件弹塑性模拟的适用性。该文对采用纤维单元对足尺钢框架振动台试验进行数值分析,表明经过构件层次的力学行为校对后的纤维单元模型能准确预测结构在大震作用下的响应及倒塌前的破坏行为。通过大量算例结果和试验结果对比,说明基于宏观单元的非线性分析方法可以准确模拟整体结构与构件的非线性行为。最后通过两个工程实例说明了宏观单元可以应用于复杂工程整体结构非线性分析中,具有实际工程应用意义。更多还原

【Abstract】 Structures and components may enter a nonlinear stage in a strong earthquake,and the precise prediction for the nonlinear behavior of structures in earthquakes is important to assess the earthquake resistant safety of the structures.In this paper,the nonlinear analysis based on a macroscopic element for different components such as CFRP concrete components,pre-stressed components and shear walls are carried out.The comparison between the analysis results and that of experiments indicated that the nonlinear analysis based on macroscopic elements can precisely simulate the nonlinear behavior of concrete components.The fiber element can also precisely simulate the nonlinear behavior of the whole structure,which is indicated through a numerical analysis of a shake-table test of a full scale steel frame.The feasibility of simulating the nonlinear behavior of the whole structure by macroscopic elements is verified through numerical comparisons between analysis results and experiments results.At last,the engineering applications indicate that a macroscopic element is practical in engineering.更多还原