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- W1964263131 abstract "Over the past decades moderate/severe earthquakes often caused great damage to bridge decks due to their mutual collision and large residual deck offset due to yielding in the traditional steel restrainers. This issue raises a need of developing a smart expansion joint with a high recentering strength to prevent decks from collision and to restore the original configuration. Buckling restrained shape memory alloy (SMA) can provide a much higher recentering strength than unconfined SMA (approximately 1.2 ∼ 1.5 times), which significantly reduces the amount of SMA and thereby the cost of the smart expansion joint proposed herein. The other important feature is that the proposed recentering mechanism always causes the confined SMA compressive, rather than tensile, when the expansion joint is in either tension or compression. This innovative recentering mechanism eliminates the issue of SMA’s break due to tensile strain limitation (approximately 0.12 strain). To verify the proposed buckling-restrained SMA symmetrical expansion joint, an individual recentering bucking restrained SMA device was quasi-statically tested in a uniaxial MTS 810 testing machine. The observed hysteresis of the device under cyclic loading shows high strength symmetrical tension/compression loops, together with a relative large ductility. The obtained experimental results were used to calibrate a confined SMA model in OpenSees. Finally, a three-span simply supported steel bridge with the proposed buckling restrained SMA expansion joints that have a high recentering tension/compression strength was numerically investigated using incremental dynamic analysis. The results reveal the high recentering ability of the bridge." @default.
- W1964263131 created "2016-06-24" @default.
- W1964263131 creator A5068305695 @default.
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- W1964263131 date "2015-04-17" @default.
- W1964263131 modified "2023-09-24" @default.
- W1964263131 title "Bridges with Innovative Buckling Restrained SMA Expansion Joints Having a High Symmetrical Tension/Compression Capacity" @default.
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- W1964263131 doi "https://doi.org/10.1061/9780784479117.040" @default.
- W1964263131 hasPublicationYear "2015" @default.
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