【作者】 吴健雄；

【导师】 何放龙；

【作者基本信息】 湖南大学 ， 结构工程， 2008， 硕士

【摘要】 随着我国城市建设的发展,近年来出现了越来越多的复杂高层建筑结构,有不少复杂高层建筑结构超出了现行规范的要求。对于此类结构,和一般的建筑结构相比,其受力情况比较复杂,难于在结构设计时预见结构的薄弱环节和破坏形态。因此,研究复杂高层建筑结构的抗震性能是十分必要的。本文以一实际工程作为背景,针对两种基于性能的抗震设计方法:动力非线性分析及静力非线性分析方法,开展了以下几方面的研究:(1)对现有梁、柱、剪力墙非线性单元模型进行了综合比较分析,在现有纤维模型的基础上,结合分段变刚度概念,建立了适合超高层及复杂结构非线性分析的纤维杆元模型,它由弹塑性区的纤维子单元及弹性区的弹性子单元组成,并推导了相应的刚度矩阵。(2)模态分析:本文应用PERFORM-3D三维结构非线性分析与性能评估软件,采用本文提出的梁柱纤维杆元模型及剪力墙纤维墙元模型,建立了一栋复杂高层建筑结构的三维非线性分析模型,对该结构进行了模态分析,得到了该结构前20阶振型的频率与周期,并分析了各阶振型的特征。(3)动力弹塑性分析:本文应用PERFORM-3D三维结构非线性分析与性能评估软件,对该高层建筑结构进行了不同地震波作用下的动力非线性时程分析。并结合该结构在不同地震波作用下的地震反应,对该结构的抗震性能进行了评估。(4)静力弹塑性分析:本文还求解了该工程实例在三种不同水平荷载模式下的push-over计算结果,并且与动力时程分析的计算结果及反应谱分析的计算结果进行了比较。可知在弹性阶段用这三种分析方法得出的结果基本一致,在弹塑性阶段用静力和动力非线性分析方法得出的结果比较一致;说明push-over方法能对结构的弹塑性行为做出比较可靠的评估。更多还原

【Abstract】 With the development of city construction, the number of complicated tall building structures is increasing rapidly in our country, some of which go beyond the limitations of Design Codes. As we know, due to the uneven distribution of the masses and lateral-resistant members, the complicated structures are subjected to complex forces as compared with the common buildings, it is difficult for engineers to recognize the weak parts and failure modes of these complicated structures under earthquake. So the research on their behavior under the seismic action is essential. Based on an actual engineering case, this paper focused on two methods of performance-based seismic design: dynamic nonlinear analysis and static nonlinear analysis, and developed research in several aspects as following:(1) On the basis of summarizing the existing nonlinear element model of beam, column and shear wall, and based on fiber model and the concept of variable stiffness, this paper proposed a fiber-line-element model, which mainly was comprised of fiber-element in the elastoplastic region and elastic-element in the elastic region, and their stiffness matrixes were established.(2) Modal analysis: This paper used the fiber model for the beam-column element and fiber-wall model for the shear wall element discussed above, a three–dimensional nonlinear analysis model of a high-rise building was established in the nonlinear analysis and performance assessment soft called PERFORM-3D. Natural frequency and natural period of the structure’s 20 order modes were obtained in modal analysis. The dynamic characteristics of the building were displayed.(3) Dynamic nonlinear analysis: This paper used the nonlinear analysis and performance assessment soft mentioned above, the time history analysis of the high-rise building was carried out under the different seismic waves (two natural waves and one man-made wave). The seismic performance of the complicated structure was assessed in conjunction with the earthquake response under different seismic waves, thus we can have a comprehensive recognition about the seismic performances of the structure.(4) Static nonlinear analysis: In this paper, static push-over analysis of an actual project was performed under three different distribution patterns of horizontal loads. Comparing the results of static nonlinear analysis with those of dynamic time-history analysis and response spectrum analysis, it can be seen that three methods are almost consistent in elasticity analysis phase, static nonlinear analysis and dynamic nonlinear analysis are almost consistent in nonlinear analysis phase. So push-over analysis can make reliable assessment to the nonlinear behavior of the structure.更多还原