《Earthquake Engineering and Structural Dynamics》杂志刊登“自定心耗能支撑框架结构的振动台试验与数值模拟”

作者：Jeffrey Erochko; Constantin Christopoulo; Robert Tremblay; Hyung-Joon Kim

刊物：《Earthquake Engineering and Structural Dynamics》，2013年，42卷第11期，1617—1635页

关键词：残余变形；钢框架；振动台试验；非线性分析；高性能系统

摘要：自定心耗能支撑是一种新型的钢支撑构件，其既能为结构提供阻尼，又具有自复位能力。本文主要论证了自定心耗能支撑在整体结构系统中的行为，并应用现代工程界常用的计算模型证实了这种能力。首先在振动台台面上，设计建立了一个三层自定心耗能支撑框架结构，并建立了两个并行全框架结构计算模型：一种采用OPENSEES非线性动力模型软件；另一种采用商业软件SAP2000建立的简化模型。对该振动台模型施加12种大地震荷载作用，在实验过程中，不进行结构的调整和修整。试验结果表明：自定心耗能支撑能够防止框架结构产生残余变形，并不会因产生磨损而出现重大损伤；两个数值模拟均能预测残余量、层间剪力以及纵向荷载，其中层间加速度峰值在模型计算中被夸大，其原因可能是在耗能支撑变化处忽略刚度造成的。

Shake table testing and numerical simulation of a self-centering energy dissipative braced frame

Authors: Jeffrey Erochko; Constantin Christopoulo; Robert Tremblay; Hyung-Joon Kim

Journal: Earthquake Engineering and Structural Dynamics, Volume 42, Issue 11, pages1617-1635, September 2013

Key words: residual drifts; steel frames; shaking table testing; nonlinear analysis; high performance systems

Abstract: The self-centering energy dissipative (SCED) brace is a new steel bracing member that provides both damping to the structure and a re-centering capability. The goal of this study was to confirm the behavior of SCED braces within complete structural systems and to confirm the ability to model these systems with both a state-of-the-art computer model as well as a simplified model that would be useful to practicing engineers. To these ends, a three-story SCED-braced frame was designed and constructed for testing on a shake table. Two concurrent computer models of the entire frame were constructed: one using the opensees nonlinear dynamic modeling software, and a simplified model using the commercial structural analysis software sap2000. The frame specimen was subjected to 12 significant earthquakes without any adjustment or modification between the tests. The SCED braces prevented residual drifts in the frame, as designed, and did not show any significant degradation due to wear. Both numerical models were able to predict the drifts, story shears, and column forces well. Peak story accelerations were overestimated in the models; this effect was found to be caused by the absence of transitions at stiffness changes in the hysteretic model of the braces. 

原文链接：http://onlinelibrary.wiley.com/doi/10.1002/eqe.2290/abstract