毕业论文外文翻译-框架横向刚度估计和横向刚度线性与非线性的连续模型的静力分析.doc
《毕业论文外文翻译-框架横向刚度估计和横向刚度线性与非线性的连续模型的静力分析.doc》由会员分享,可在线阅读,更多相关《毕业论文外文翻译-框架横向刚度估计和横向刚度线性与非线性的连续模型的静力分析.doc(21页珍藏版)》请在淘文阁 - 分享文档赚钱的网站上搜索。
1、宁波工程学院毕业设计(论文)-外文翻译 外文原文: Lateral stiffness estimation in frames and its implementation to continuum modelsfor linear and nonlinear static analysisTuba Eroglu Sinan AkkarReceived: 23 April 2010 / Accepted: 17 November 2010 Springer Science+Business Media B.V. 2010Abstract Continuum model is a useful
2、 tool for approximate analysis of tall structures including moment-resisting frames and shear wall-frame systems. In continuum model, discrete buildings are simplified such that their overall behavior is described through the contributions of flexural and shear stiffnesses at the story levels. There
3、fore, accurate determination of these lateral stiffness components constitutes one of the major issues in establishing reliable continuum models even if the proposed solution is an approximation to actual structural behavior. This study first examines the previous literature on the calculation of la
4、teral stiffness components (i.e. flexural and shear stiffnesses) through comparisons with exact results obtained from discrete models. A new methodology for adapting the heightwise variation of lateral stiffness to continuum model is presented based on these comparisons. The proposed methodology is
5、then extended for estimating the nonlinear global capacity of moment resisting frames. The verifications that compare the nonlinear behavior of real systems with those estimated from the proposed procedure suggest its effective use for the performance assessment of large building stocks that exhibit
6、 similar structural features. This conclusion is further justified by comparing nonlinear response history analyses of single-degree-of-freedom (sdof) systems that are obtained from the global capacity curves of actual systems and their approximations computed by the proposed procedure.Keywords Appr
7、oximate nonlinear methods Continuum model Global capacity Nonlinear response Frames and dual systemsT. ErogluDepartment of Civil Engineering, Akdeniz University, 07058 Antalya, Turkeye-mail: etubametu.edu.trS. Akkar (B)Department of Civil Engineering, Middle East Technical University, 06531 Ankara,
8、Turkeye-mail: sakkarmetu.edu.tr1 IntroductionReliable estimation of structural response is essential in the seismic performance assessment and design because it provides the major input while describing the global capacity of structures under strong ground motions.With the advent of computer technol
9、ogy and sophisticated structural analysis programs, the analysts are now able to refine their structural models to compute more accurate structural response. However, at the expense of capturing detailed structural behavior, the increased unknowns in modeling parameters, when combined with the uncer
10、tainty in ground motions, make the interpretations of analysis results cumbersome and time consuming. Complex structural modeling and response history analysis can also be overwhelming for performance assessment of large building stocks or the preliminary design of new buildings. The continuum model
11、, in this sense, is an accomplished approximate tool for estimating the overall dynamic behavior of moment resisting frames (MRFs) and shear wall-frame (dual) systems. Continuum model, as an approximation to complex discrete models, has been used extensively in the literature. Westergaard (1933) use
12、d equivalent undamped shear beam concept for modeling tall buildings under earthquake induced shocks through the implementation of shear waves propagating in the continuum media. Later, the continuous shear beam model has been implemented by many researchers (e.g. Iwan 1997; Glkan and Akkar 2002; Ak
13、kar et al. 2005; Chopra and Chintanapakdee 2001) to approximate the earthquake induced deformation demands on frame systems. The idea of using equivalent shear beams was extended to the combination of continuous shear and flexural beams by Khan and Sbarounis (1964).Heidebrecht and Stafford Smith (19
14、73) defined a continuum model (hereinafter HS73) for approximating tall shear wall-frame type structures that is based on the solution of a fourthorder partial differential equation (PDE). Miranda (1999) presented the solution of this PDE under a set of lateral static loading cases to approximate th
15、e maximum roof and interstory drift demands on first-mode dominant structures. Later, Heidebrecht and Rutenberg (2000) showed a different version of HS73 method to draw the upper and lower bounds of interstory drift demands on frame systems. Miranda and Taghavi (2005) used the HS73 model to acquire
16、the approximate structural behavior up to 3 modes. As a follow up study, Miranda and Akkar (2006) extended the use of HS73 to compute generalized drift spectrum with higher mode effects. Continuum model is also used for estimating the fundamental periods of high-rise buildings (e.g. Dym and Williams
17、 2007). More recently, Gengshu et al. (2008) studied the second order and buckling effects on buildings through the closed form solutions of continuous systems. While the theoretical applications of continuum model are abundant as briefly addressed above, its practical implementation is rather limit
18、ed as the determination of equivalent flexural (EI) and shear (GA) stiffnesses to represent the actual lateral stiffness variation in discrete systems have not been fully addressed in the literature. This flaw has also restricted the efficient use of continuum model beyond elastic limits because the
19、 nonlinear behavior of continuum models is dictated by the changes in EI and GA in the post-yielding stage This paper focuses on the realistic determination of lateral stiffness for continuum models. EI and GA defined in discrete systems are adapted to continuum models through an analytical expressi
20、on that considers the heightwise variation of boundary conditions in discrete systems. The HS73 model is used as the base continuum model since it is capable of representing the structural response between pure flexure and shear behavior. The proposed analytical expression is evaluated by comparing
21、the deformation patterns of continuum model and actual discrete systems under the first-mode compatible loading pattern. The improvements on the determination of EI and GA are combined with a second procedure that is based on limit state analysis to describe the global capacity of structures respond
22、ing beyond their elastic limits. Illustrative case studies indicate that the continuum model, when used together with the proposed methodologies, can be a useful tool for linear and nonlinear static analysis.2 Continuum model characteristics The HS73 model is composed of a flexural and shear beam to
23、 define the flexural (EI) and shear (GA) stiffness contributions to the overall lateral stiffness. Themajor model parameters EI and GA are related to each other through the coefficient (Eq.1). As goes to infinity the model would exhibit pure shear deformation whereas = 0 indicates pure flexural defo
24、rmation. Note that it is essential to identify the structural members of discrete buildings for their flexural and shear beam contributions because the overall behavior of continuum model is governed by the changes in EI and GA. Equation 2 shows the computation of GA for a single column member in HS
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 毕业论文 外文 翻译 框架 横向 刚度 估计 线性 非线性 连续 模型 静力 分析
限制150内