實尺寸兩層特殊同心斜撐鋼構架試驗反應與有限元素分析研究

Experimental and Analytical Responses of 2-Story Steel Concentrically X-Braced Frames

蔡青宜(Ching-Yi Tsai) ； 蔡克銓(Keh-Chyuan Tsai) ； 魏志毓(Chih-Yu Wei) ； 林志翰(Chih-Han Lin) ； 吳安傑(An-Chien Wu) ； 游宜哲(Yi-Jer Yu)

《中國土木水利工程學刊》 21卷4期 (2009/12) Pp. 453-472

https://doi.org/10.6652/JoCICHE.200912_21(4).0007

摘要

本研究試體為一實尺寸兩層特殊同心斜撐鋼構架，試體高度為6.66公尺，寬度為6.7公尺，斜撐安排之形狀為X型。試驗總共進行三次，使用相同梁柱構架，替換不同形式之斜撐與接合板。本研究分別建立三次試驗之有限元素分析模型，進行各試體之反覆側推分析。文中詳細介紹分析模型之材料、分析元素、邊界條件、假設之初始缺陷與施力方式。試驗結果顯示試體的確能提供足夠的消能能力，頂層位移角變形容量接近正負3%弧度，而X型配置之斜撐挫屈行為會互相牽動，所有斜撐皆發生挫屈。結構變形與破壞集中於斜撐與接合板，斜撐最大面外變形可達40 cm，但並未對梁柱造成明顯破壞。有限元素分析結果顯示分析模型可以準確分析特殊同心斜撐構架之斜撐後挫屈行為，對於斜撐挫屈、接合板彎折與斜撐局部挫屈行為皆可相當準確的模擬。

關鍵字

有限元素 ； 同心斜撐構架 ； 初始缺陷 ； 斜撐挫屈 ； 接合板

並列摘要

Measuring 6.7 meters wide and 6.66 meters tall, three full scale 2- story special concentrically braced frames (SCBFs) were tested in National Center for Research on Earthquake Engineering (NCREE) in Taiwan. This is a cooperative research project between researchers from Taiwan and U.S. to investigate the seismic design methods for brace-to-gusset connection details. The objectives of this study include the study of the cyclic behaviors of the SCBF and develop the valid design and analytical procedures. This paper introduces the experimental setup and the key experimental results of the specimen, such as the peak inter-story drifts and buckling responses of the braces. The nonlinear FEM program ABAQUS was used to simulate the responses of the specimen. This paper describes the detailed analytical model and the modeling techniques including boundary conditions, initial imperfections, load applying techniques. The cyclic story shear and brace forces versus the story drift relationships obtained from the test and the FEM analytical results are presented. This paper concludes with the procedures for finite element analysis of steel SCBFs.

並列關鍵字

FEM ； CBF ； initial imperfections ； buckling of the braces ； gusset plate