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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。
The elastic and plastic damage occurs when the structure and the component enter the plastic phase under the rare earthquake. The correct mechanical behavior after the simulated structure enters the nonlinear state is of great significance to evaluate the seismic safety of the structure. In this paper, the elastic-plastic analysis of CFRP concrete members, prestressed concrete beams and shear walls is carried out by macroscopic elements such as fiber elements and multi-spring elements, and compared with the test results, which shows the applicability of macroscopic elements to elastoplastic simulation of concrete elements . In this paper, the numerical analysis of the test of shaker table of full-scale steel frame using fiber elements shows that the fiber unit model calibrated by component-level mechanical behavior can accurately predict the response of structures under the action of large earthquakes and the failure behavior before collapse. By comparing a large number of examples and test results, it is shown that the nonlinear analysis method based on macrocell can accurately simulate the nonlinear behavior of the whole structure and the components. Finally, two engineering examples are given to illustrate that macroscopic elements can be applied to the nonlinear analysis of the complex structure as a whole, which has practical application significance.