【摘要】 为了在保证一定计算效率的条件下,尽可能的提高钢框架抗震性能有限元分析的精度,该文采用通用有限元软件ABAQUS建立非线性有限元模型,深入探讨了利用多尺度模型的方法解决钢框架抗震计算问题。建立钢框架梁柱节点的板壳、杆系以及多尺度模型,并与国内外典型节点试验进行对比分析,验证有限元微观模型与宏观模型界面连接方法的可行性,有效实现不同尺度模型间的变形协调;进行在典型地震波下不同高度钢框架的弹塑性时程计算,并比较几种模型的地震响应以及计算效率。结果表明:多尺度有限元模型在保证一定计算效率的同时可更为逼真的模拟复杂受力构件的边界状况及其在整体结构响应中的性能;随着框架层数以及地震波持续时间的增加,其优势越来越明显,证明利用多尺度模型方法是在精度和计算代价之间的一个均衡解决途径,为今后的工程抗震分析提供有力的工具。更多还原

【Abstract】 In order to ensure the computational efficiency and to improve the accuracy of finite element seismic analysis of steel frames,nonlinear finite element model is established using general finite element software ABAQUS.The application of multi-scale model in solving seismic behaviour of steel frames is discussed.The steel beam-column connections,members and multi-scale models are established,and then are proved to be valid through comparisons with typical connection tests.Elastic-plastic time-history analysis is performed to the steel frame with different height under typical seismic waves,and the computation efficiency is compared between several models.The results show that: multi-scale finite element model,with good computational efficiency,can simulate the boundary conditions of components under complex loads;with more layers involved and longer earthquake duration,the advantage becomes more evident,proving the use of multi-scale model is a balanced solution between accuracy and computation cost.更多还原