Seismic Performance of Re-Centering Brace
Date Issued
2007
Date
2007
Author(s)
Lin, Ching-Chieh
DOI
zh-TW
Abstract
Re-centering brace (RCB) comprises of (1) the tensioning element and subjected to the post-tensioned force (PT), (2) a mechanism that assures the elongation of the tensioning elements under both compressive and tensile brace forces and (3) a energy dissipating mechanism. Re-centering braces could be made by combining the characteristics of the glass fiber reinforced plastic (GFRP) and the friction devices (FDs). Thus, the post-tensioned system possesses re-centering capability from the pre-stressed GFRP while dissipating seismic energy in the friction devices.
This research proposes two types of re-centering braces. The force-deformation relationships of the re-centering braces are studied analytically first. Then the test results of the long slotted friction devices, GFRP tendons and two reduced scale re-centering braces are discussed in details.
Tests confirm that (1) hysteretic behavior of the long slotted friction devices is very stable. The friction coefficient between the steel plate and the brass (C2680) shim is about 0.32, (2) the special anchors attached to the 12.7mm diameter GFRP tendons imcrese the tendon tension strength from 30kN to 70kN, but the failure of the GFRP is still within the grip of the anchor, (3) the performance of the proposed RCBs is not satisfactory, and the RCBs failed at the GFRP anchor, (4) the stiffness of the RCBs can be accurately predicted, (5)Nonlinear time history analysis conducted on the moment resisting frame (MRF) and the re-centering braced frame (RCBF) confirmed that the RCBF (compared with MRF) can effectively reduce the inter-story drift and the residual deformation.
Subjects
預力
自動復
位
摩擦消能
玻璃纖維
非線性動力分析
post-tension
re-centering
friction device
GFRP
nonlinear time history analysis
Type
thesis
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