【作者】 吕品；

【导师】 邹祖军；

【作者基本信息】 同济大学 ， 结构工程， 2008， 硕士

【摘要】 本文系统介绍了当前国际结构振动控制的公共平台——Benchmar模型,给出使用通用有限元软件ANSYS对第3阶段9层非线性钢框架抗震结构的有限元建模,结果表明,模态、无控地震反应分析结果和ASCE给出的MATLAB结果相同。利用转动PTMD对此模型的耗能减振数值仿真分析的结果表明:转动PTMD是一种性能很好的阻尼器系统,使用本文给出ANSYS的Benchmark有限元模型来进行耗能减振控制分析是方便的、可行的。本文同时结合我国现行规范和国内外相关研究成果,通过系统的理论分析和数值计算证明了转动PTMD可行性和有效性。在总结前人非线性有限元分析理论的基础上,借助于大型有限元分析程序ANSYS,对地震荷载作用下框架的反应进行计算机仿真模拟。在模拟过程中,钢材采用Von-Mises屈服条件和等向强化本构关系。其中本文主要内容包括以下几个方面:1.钢框架的有限元程序验证。用ANSYS有限元程序分析了钢框架,并与文献进行了对比,结果表明用此程序分析钢框架是可行的。2.钢框架的非线性分析。通过Benchmark中九层非线性钢结构,分析了转动PTMD与原结构的质量比、阻尼比以及PTMD的频率等参数的变化对结构地震反应的影响,并给出了Benchmark评估标准。分析结果表明转动PTMD对高层结构地震反应的控制是有效的。更多还原

【Abstract】 Benchmark control problem is to provide a clear basis to evaluate the efficacy of various structural strategies. In this paper, the 9-story steel frame of the nonlinear benchmark was selected as an analysis model. The finite element model about the same benchmark model was created using the ANSYS software. The model analysis and the seismic nonlinear analysis of this benchmark model were done. In the end, the numerical results of the benchmark model controlled with Rotational Passive Tuned Mass Damper indicate that the Rotational Passive Tuned Mass Damper is a good dissipation device and the analysis of structural dissipation control using ANSYS is convenient.Based on current design codes of our country and domestic and overseas relative research achievements, the practicability and effectiveness of the rotational PTMD are approved through systematical theoretic modeling and numerical computation. Computer simulations on steel frames under Earthquake loading have been performed via ANSYS—a great finite element analysis program—on the basis of non-linear finite element analysis theory. In the procession of the simulation, Von-Mises yield criterion and bilinear isotropic hardening stress-strain relationship have been used for steel bar.The main contents of this dissertation are listed as follows: First, the finite element program of analysing the steel frames was verified. The author analyzed the steel frame by the finite element program of ANSYS and compared with documentation, the result showed that analyzing steel frames by using the program is feasible. Second, the nonlinear analysis is made on the steel frames. Base on the 9-story steel frame of the nonlinear benchmark, the effects of the rotational PTMD varying parameters, such as mass ratio, damping ratio, frequency of PTMD, on earthquake responses are discussed. The evaluation criterion for benchmark problem is given and numerical results show that rotational PTMD can control the earthquake responses efficiently.更多还原