There are several different mechanisms for creating a restoring force to return a building structure to plumb after an earthquake. One approach is to allow structure to undergo controlled rocking at discrete locations such as column-base joint or beam-column joints. Another approach is to employ braces or seismic control devices with self-centering capabilities. Due to its inherent nonlinear elastic behavior, shape memory alloys (SMAs) have been considered to develop self-centering braces or devices. Recently, NiTiHfPd alloys that have very high strength (up to 2000 MPa), high dissipation/damping capacity, good cyclic stability and large operating temperature have been developed. This study explores the superelastic response of NiTiHfPd SMAs under various conditions and illustrates their application into seismic applications. In order to collect experimental data, uniaxial tests are conducted on superelastic NiTiHfPd SMAs in the temperature range of -35 ºC to 25 ºC, and at the loading frequencies of 0.05 Hz to 1 Hz with four different strain amplitudes. The effects of loading rate and temperature on superelastic characteristics of NiTiHfPd SMAs are examined. A numerical model that reliably simulates the response of NiTiHfPd SMAs is developed. Then, a four-story moment resisting frame with and without supplementary SMA damping elements is designed and modeled. Nonlinear response history analyses are conducted to assess the performance of NiTiHfPd SMAs in mitigating seismic response and limiting residual drifts of steel frames subjected to strong ground motions.
|Title of host publication||11th National Conference on Earthquake Engineering 2018, NCEE 2018|
|Subtitle of host publication||Integrating Science, Engineering, and Policy|
|Number of pages||11|
|State||Published - 2018|
|Event||11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018 - Los Angeles, United States|
Duration: Jun 25 2018 → Jun 29 2018
|Name||11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy|
|Conference||11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018|
|Period||6/25/18 → 6/29/18|
Bibliographical noteFunding Information:
This material is based upon the work supported by the National Science Foundation under Grant Number CMMI-1538770.
© NCEE 2018.All rights reserved.
Copyright 2020 Elsevier B.V., All rights reserved.
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology