鋼造雙核心自復位斜撐實驗分析與韌性斜撐構架之動力歷時行為
Other Title
Seismic Performance of Steel Dual-Core SCBs and Braced Frames with BRBs and SCBs
Journal
結構工程
Journal Volume
29
Journal Issue
3
Start Page
81
End Page
104
ISSN
1021-7878
Date Issued
2014-09
Author(s)
Abstract
本研究說明一具反覆載重下有旗幟形自復位行為之雙核心自復位斜撐(Self-Centering Brace，簡稱SCB)之力學行為，並以斜撐實驗、有限元素分析及斜撐構架非線性動力歷時分析驗證耐震性能。文章首先說明挫屈束制斜撐(BRB)的耐震行為，並以此介紹新發展的雙核心SCB在反覆載重下之自復位力學消能行為，雙核心SCB試驗驗證在2.5%層間位移角下可保持良好的耐震行為，拉力構件最大應變為1.3%、最大軸力可達1300kN。本研究也利用有限元素分析進一步驗證雙核心SCB試驗中觀察到的力學行為及遲滯迴圈反應，並以16組雙核心SCB模型進行參數研究，觀察不同拉力構件材料、尺寸、初始預力與摩擦力下之雙核心SCB反應。為進一步地瞭解自復位斜撐系統的耐震性能，本研究設計含BRB及雙核心SCB的三種不同高度的挫屈束制斜撐構架(BRBF)及自復位斜撐構架(SCBF)，由非線性動力歷時分析設計地震層級(DBE)、最大地震層級(MCE)與近斷層地震對兩種斜撐構架的耐震反應，非線性動力歷時分析結果顯示SCBF相較於BRBF在地震作用下有較小的層間側位移角與殘餘變形角。
A new steel dual-core self-centering brace(SCB) is developed in Taiwan to have a flag-shaped re-centering hysteretic response under cyclic loads. Axial deformation capacity of the brace is doubled by serial deformations of two sets of tensioning elements arranged in parallel. In this paper, the mechanics of the new brace is first explained, followed by testing one SCB to evaluate its cyclic performance. Finite element analysis is conducted on the specimen to verify the mechanics and hysteretic responses observed in the test. Finite element analyses are also performed on other 16 dual-core SCBs to evaluate how tensioning element types, initial PT force, and friction force affect the cyclic performance of the brace. Additionally, three braced frames of varying heights are designed using two bracing members, SCBs and buckling-restrained braces (BRBs). Nonlinear time history analyses are conducted on these braced frames to obtain seismic demands under both design and maximum considerable levels of earthquake motions and near-field motions. SCB frames generally exhibit a smaller peak interstory drift and residual drift than BRB frames.
Subjects
鋼造雙核心自復位斜撐
鋼造挫屈束制斜撐
斜撐實驗
構架非線性動力歷時分析
殘餘變形
Dual-core self-centering brace (SCB)
Buckling-restrained brace (BRB)
Cyclic test
Non-linear time history analysis of frames
Residual deformation
Type
journal article