土木工程学报
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使用基于模型的积分算法的钢框架非线性时程分析
傅  博1  蒋欢军2
1.长安大学,陕西西安710061;2.同济大学,上海200092
Nonlinear time history analysis of steel frame using model-based integration algorithm
Fu Bo1  Jiang Huanjun2
1.Chang’an University, Xi’an 710061, China; 2. Tongji University, Shanghai 200092, China
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摘要 基于模型的积分算法为新近提出的一类同时具有无条件稳定及显式两种特性的积分算法。为了更加深入地了解该类算法的计算流程及计算效果,使用一种基于模型的积分算法对钢框架进行地震作用下的非线性时程分析。采用基于刚度的纤维梁柱单元来建立钢框架的有限元模型,并采用基于模型的积分算法求解结构运动方程,详细地给出了分析步骤。根据美国规范,设计了一个四层钢框架。利用Matlab/Simulink编制了有限元数值仿真平台,建立了钢框架的有限元模型。同时,使用OpenSees软件建立了相同的结构模型,并采用Newmark常平均加速度法。OpenSees模型的分析结果作为参照。结果表明:在使用基于模型的积分算法时,不需要迭代。此外,即便积分时间步长较大时,基于模型的积分算法依然具有较高的精度。
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傅 博 蒋欢军
关键词 钢框架非线性时程分析基于模型的积分算法数值模拟    
Abstract

 Model-based integration algorithms are newly developed integration algorithms with unconditional stability and explicitness. A series of nonlinear time history analyses for a steel frame subjected to the earthquakes using a family of model-based integration algorithm were conducted so as to investigate the calculation process and the computing efficiency of the new algorithm. The stiffness-based beam-column element with fiber sections was used to simulate the steel frame and the model-based algorithm was adopted to solve the equation of motion for the structure. The detailed analytical procedure was provided. A four-story steel frame was designed in accordance with the American codes. A finite element numerical simulation platform was compiled with the aid of Matlab/Simulink. The finite element model of the steel frame was built accordingly. In the meantime, a finite element model of the steel frame using the OpenSees software was constructed as well. The Newmark constant average acceleration method was adopted to solve the OpenSees model, whose numerical results were used as references. The results show that when using the new algorithm, iteration is not required and satisfactory results can be obtained even if the integration time step is relatively large.

Key wordssteel frame    nonlinear    time history analysis    model-based integration algorithm    numerical simulation
    
引用本文:   
傅 博 蒋欢军. 使用基于模型的积分算法的钢框架非线性时程分析[J]. 土木工程学报, 2018, 51(S1): 58-64.
Fu Bo Jiang Huanjun. Nonlinear time history analysis of steel frame using model-based integration algorithm. 土木工程学报, 2018, 51(S1): 58-64.
链接本文:  
http://manu36.magtech.com.cn/Jwk_tmgcxb/CN/     或     http://manu36.magtech.com.cn/Jwk_tmgcxb/CN/Y2018/V51/IS1/58
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