Comparison between Shape Memory Alloy Seismic Restrainers and Other Bridge Retrofit Devices
Publication: Journal of Bridge Engineering
Volume 12, Issue 6
Abstract
Strong earthquakes can result in large longitudinal displacements in multiple-frame bridges. This could lead to excessive displacements/openings at the intermediate joints. Bridges with small seat widths are vulnerable to the unseating of their superstructure. Seismic steel restrainers are currently used to limit the joint openings in bridges. However, past earthquakes have shown that restrainer cables have limitations in regards to preventing unseating in bridges. Other devices have been proposed to limit joint displacements, including metallic dampers, viscoelastic dampers, and shape memory alloys (SMAs), which are known for their ability to recover their original shape after being deformed. A sensitivity study and a case study are conducted using computer simulations to compare the effectiveness of SMA retrofit devices with other devices. The results show that the effectiveness of the devices is a function of the characteristics of the bridge frames and the ground motion characteristics. In all cases, the steel restrainer cables were the least effective in limiting joint displacements. The SMA devices have the additional benefit of significantly limiting the residual joint displacement in bridges.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 12 • Issue 6 • November 2007
Pages: 700 - 709
Copyright
© 2007 ASCE.
History
Received: Dec 19, 2005
Accepted: Dec 8, 2006
Published online: Nov 1, 2007
Published in print: Nov 2007
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