静力弹塑性分析法在侧向荷载分布方式下的评估研究

中文字数:3448,英文字数:3271

静力弹塑性分析法在侧向荷载分布方式下的评估研究
Armagan KORKMAZ1, Ali SARI2
 1访问学者,土木工程学院, 得克萨斯大学, 奥斯汀, TX 78712, PH: 512-232-9216; armagan@mail.utexas.edu
2博士, 土木工程学院, 得克萨斯大学, 奥斯汀, TX 78712, PH: 512-232-9216; ali_sari@mail.utexas.edu

摘要：
 这项研究的目的是通过弹塑性分析法和非线性时程分析法来评估框架结构的性能或多种荷载形式及自然周期的多样性。弹塑性分析法的荷载分布状态有三角形、IBC（k=2），和矩形。在这个研究中四种典型的钢筋混凝土框架结构被采用，它们分别有四种不同的自然周期。非线性时程分析法是计算地震的最好方法，但美国的FEMA-273容量震谱法和ATC-40位移系数法推荐使用静力弹塑性分析法。这篇论文将比较分别利用静力弹塑性分析法与非线性时程分析法分析所得到的结果。为了评估弹塑性分析法在三种不同荷载形式和四种自然周期下的结果，非线性时程分析法也被执行来对照。在不同地震下分布在全球的50个站点纪录了地面运动情况被用来做分析，通过比较静力弹塑性分析法和非线性时程分析法的结果来选择这种典型框架结构在特殊自然周期下最佳的荷载分布方式。
 
关键词：静力弹塑性分析、非线性时程分析、荷载形式、抗弯矩框架

EVALUATION OF LATERAL LOAD PATTERN
IN PUSHOVER ANALYSIS

 Armagan KORKMAZ1, Ali SARI2
 
1Visitor Researcher, Department of Civil Engineering, University of Texas at Austin, Austin,TX78712, PH: 512-232-9216; armagan@mail.utexas.edu
2Ph. D. Student, Department of Civil Engineering, University of Texas at Austin, Austin, TX 78712, PH: 512-232-9216; ali_sari@mail.utexas.edu
 
 

ABSTRACT

The objective of this study is to evaluate the performance of the frame structures or various load patterns and variety of natural periods by performing pushover and nonlinear dynamic time history analyses. The load distributions for pushover analyses are chosen as triangular, IBC (k=2) and rectangular. Four different framed structures are used, which are typical reinforced concrete (R\C) frame systems and have four different natural periods. Even though the nonlinear dynamic time history analysis is the best way to compute seismic demands FEMA-273 and ATC-40 proposes to use of nonlinear static procedure or pushover analysis. This paper is also intended to compare the results of pushover and nonlinear dynamic time history analyses. To evaluate the results from the pushover analyses for three load patterns and also four natural periods, nonlinear dynamic time history analyses are performed. Earthquake ground motions recorded at 50 stations during various earthquakes overall the world are used in the analyses. Pushover and nonlinear time history analyses results are compared to choose the best load distribution for specific natural period for this type of frame structure.
 

Keywords:  Pushover analysis, nonlinear time history, load patterns, moment-resisting frame

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