Structure and Infrastructure Engineering.doc
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1、 Structure and Infrastructure Engineering Maintenance, Management, Life-Cycle Design and Performance ISSN: 1573-2479 (Print) 1744-8980 (Online) Journal homepage: http:/ Parametric study of seismic performance of super- elastic shape memory alloy-reinforced bridge piers Bipin Shrestha & Hong Hao To c
2、ite this article: Bipin Shrestha & Hong Hao (2015): Parametric study of seismic performance of super-elastic shape memory alloy-reinforced bridge piers, Structure and Infrastructure Engineering, DOI: 10.1080/15732479.2015.1076856 To link to this article: http:/dx.doi.org/10.1080/15732479.2015.107685
3、6 Published online: 01 Sep 2015. Submit your article to this journal Article views: 70 View related articles View Crossmark data Full Terms & Conditions of access and use can be found at http:/ Download by: University of Illinois at Urbana-Champaign Date: 10 February 2016, At: 07:48 DownloadedbyUniv
4、ersityofIllinoisat Urbana-Champaign at 07:4810February 2016 Structure and InfraStructure engIneerIng, 2015 http:/dx.doi.org/10.1080/15732479.2015.1076856 Parametric study of seismic performance of super-elastic shape memory alloy-reinforced bridge piers Bipin Shrestha and Hong Hao department of civi
5、l engineering, curtin university, Bentley, australia ABSTRACT One of the important measures of post-earthquake functionality of bridges after a major earthquake is residual displacement. In many recent major earthquakes, large residual displacements resulted in demolition of bridge piers due to the
6、loss of functionality. Replacing the conventional longitudinal steel reinforcement in the plastic hinge regions of bridge piers with super-elastic shape memory alloy (SMA) could significantly reduce residual deformations. In this study, numerical investigations on the performance of SMA-reinforced c
7、oncrete (RC) bridge bents to monotonic and seismic loadings are presented. Incremental dynamic analyses are conducted to compare the response of SMA RC bents with steel RC bents considering the peak and the residual deformations after seismic events. Numerical study on multiple prototype bridge bent
8、s with single and multiple piers reinforced with super-elastic SMA or conventional steel bars in plastic hinge regions is conducted. Effects of replacement of the steel rebar by SMA rebar on the performance of the bridge bents are studied. This paper presents results of the parametrical analyses on
9、the effects of various design and geometric parameters, such as the number and geometry of piers and reinforcement ratio of the RC SMA bridge bents on its performance. ARTICLE HISTORY received 12 March 2015 revised 9 July 2015 accepted 15 July 2015 KEYWORDS Shape memory alloy; residual displacement;
10、 reinforced concrete; bridge piers; incremental dynamic analysis 1. Introduction Reinforced concrete (RC) bridges designed to current seismic codes in the regions of high seismicity are susceptible to severe damage during large earthquakes, leading to the possibility of large residual displacements.
11、 During major earthquakes such as the Northridge 1994, Kobe 1995, Duzce 1999 and other events, it was found that bridge structures sustained high residual drifts rendering the bridge to be unserviceable. Consequently, post- disaster rescue and relief operations were severely affected. The principal
12、factor leading to the loss of serviceability was residual strains in steel reinforcement bars after an earthquake resulting in larger residual inclination of bridge piers. During the 1995 Kobe earthquake, 88 bridge piers along the Hanshin expressway were demolished because of the large residual incl
13、ination even though some of those piers had experienced only light damage (Fujino, Satoko, & Abe, 2005). As a result, there is a consensus among the engineering practitioners that the residual displace- ment has a greater significance in the overall structural perfor- mance of the infrastructure und
14、er earthquake loading. As bridges are the key components in the transportation net- work for providing emergency services following an earthquake, it is necessary to minimise the loss by enhancing the performance of the bridges. During strong earthquakes, steel reinforcements are expected to endure
15、large plastic deformations under severe shakings to dissipate seismic energy. This inevitably leads to sig- nificant residual deformation that could make bridge structures unserviceable or unsafe. To address these problems innovative design methods capable of re-centreing after an earthquake event a
16、re being explored since last few decades. One of such innovative methods is using a relatively new material for civil infrastruc- ture system, super-elastic shape memory alloy (SMA) as rein- forcement on structures. SMAs are able to undergo large strains and still recover their shape through either
17、heating (shape- memory effect) or stress removal (super-elastic effect) (Wilson & Welsolowsky, 2005). In general, SMAs exhibit two distinct crystal structures or phases. These phases are martensite, with the ability to completely recover residual strains by heating, and austenite, with nominally zer
18、o residual strain when unloaded without the application of heat. Super-elastic behaviour of SMA would be beneficial in many ways particularly for civil engineering appli- cations, especially to reduce permanent deformation of structural components. Previous studies have highlighted that super-elasti
19、c SMA could be an ideal alternative material for use as reinforcement in RC structures to reduce the large residual deformation. Several studies have been conducted in recent years using the super-elas- tic behaviour of SMA by placing it in plastic hinge locations of RC structures to mitigate the la
20、rge residual deformations after strong earthquake shakings. Saaidi and Wang (2006) explored the effectiveness of using the super-elastic SMA bars at plastic hinge regions of RC columns by conducting shake table exper- iments. Youssef, Alam, and Nehdi (2008) utilised SMA in the CONTACT Bipin Shrestha
21、 bipin.shresthapostgrad.curtin.edu.au 2015 taylor & francis 2 B. SHRESTHA ANd H. HAO DownloadedbyUniversityofIllinoisat Urbana-Champaign at 07:4810February 2016 plastic hinge region of RC beam column joints. Saiidi, O Brien, and Sadrossadat-Zadeh (2009) compared the responses of SMA- reinforced RC c
22、olumn with normal concrete and engineered cementitious composite (ECC) to steel RC column under cyclic loading test. Cruz and Saiidi (2011) investigated the seismic performance of a large-scale four-span RC bridge incorporating innovative plastic hinges consisting of super-elastic SMA and ECC using
23、shake table tests. The above studies experimentally validate that SMA reinforcement in critical regions of concrete structures could significantly reduce the earthquake-induced damages and dissipate an adequate amount of energy. Billah and Alam (2012), Zafar and Andrawes (2012) numer- ically investi
24、gated hybrid SMA column with SMA bars at the plastic hinge regions as non-corroding reinforcement for ductile RC structures. Billah and Alam (2014) extended their study by assessing the seismic performance of SMA RC bridge piers using fragility function. Tazarv and Saiidi (2013, 2015) investigated t
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