Seismic Response of the Three-Span Bridge with Innovative Materials Including Fault-Rupture Effect

The seismic performance of the SR99 Bridge with conventional and advanced details in Seattle, Washington, was studied via a nonlinear, time history analysis of a multidegree of freedom model. The bridge consists of three spans supported on two single-column piers and will be the first built bridge i...

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Main Authors: Jiping Ge, M. Saiid Saiidi
Format: Article
Language:English
Published: Hindawi Limited 2018-01-01
Series:Shock and Vibration
Online Access:http://dx.doi.org/10.1155/2018/4276167
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spelling doaj-3e789eee76294480ae92552e0376b8c12020-11-25T00:48:23ZengHindawi LimitedShock and Vibration1070-96221875-92032018-01-01201810.1155/2018/42761674276167Seismic Response of the Three-Span Bridge with Innovative Materials Including Fault-Rupture EffectJiping Ge0M. Saiid Saiidi1School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, ChinaDepartment of Civil and Environmental Engineering, University of Nevada, Reno, NV 89557, USAThe seismic performance of the SR99 Bridge with conventional and advanced details in Seattle, Washington, was studied via a nonlinear, time history analysis of a multidegree of freedom model. The bridge consists of three spans supported on two single-column piers and will be the first built bridge in the world in which superelastic shape memory alloy (SMA) and engineered cementitious composite (ECC) are implemented to reduce damage at plastic hinges and minimize residual displacements. Existing finite-element formulations in the finite-element software OpenSees are used to capture the response of the advanced materials used in the bridge. The earthquake induced by strike-slip fault was assumed to produce a surface rupture across the SR99 Bridge. The effect of the rupture was modeled by a static, differential ground displacement in the fault-parallel direction across the rupture. The synthetic suite of scaled bidirectional near-fault ground motions used in the analysis contains common near-fault features including a directivity pulse in the fault-normal direction and a fling step in the fault-parallel direction. Comparisons are made on behavior of two different bridge types. The first is a conventional reinforced concrete bridge and the second is a bridge with Nickel-Titanium (NiTi) SMA reinforcing bar at the plastic hinge zone and ECC in the whole column. Fault-parallel near-fault earthquakes typically exhibit a static permanent ground displacement caused by the relative movement of the two sides of the fault. When the fault is located between piers, the pier shows a higher demand. Fault-normal analysis results show effectiveness of the innovative interventions on the bridges in providing excellent recentering capabilities with minimal damage to the columns. But the maximum drift computed in the SMA bridge is slightly higher than reinforced concrete (RC) bridges, contributed by comparatively low stiffness of the superelastic SMA bars compared to the steel reinforcing bars.http://dx.doi.org/10.1155/2018/4276167
collection DOAJ
language English
format Article
sources DOAJ
author Jiping Ge
M. Saiid Saiidi
spellingShingle Jiping Ge
M. Saiid Saiidi
Seismic Response of the Three-Span Bridge with Innovative Materials Including Fault-Rupture Effect
Shock and Vibration
author_facet Jiping Ge
M. Saiid Saiidi
author_sort Jiping Ge
title Seismic Response of the Three-Span Bridge with Innovative Materials Including Fault-Rupture Effect
title_short Seismic Response of the Three-Span Bridge with Innovative Materials Including Fault-Rupture Effect
title_full Seismic Response of the Three-Span Bridge with Innovative Materials Including Fault-Rupture Effect
title_fullStr Seismic Response of the Three-Span Bridge with Innovative Materials Including Fault-Rupture Effect
title_full_unstemmed Seismic Response of the Three-Span Bridge with Innovative Materials Including Fault-Rupture Effect
title_sort seismic response of the three-span bridge with innovative materials including fault-rupture effect
publisher Hindawi Limited
series Shock and Vibration
issn 1070-9622
1875-9203
publishDate 2018-01-01
description The seismic performance of the SR99 Bridge with conventional and advanced details in Seattle, Washington, was studied via a nonlinear, time history analysis of a multidegree of freedom model. The bridge consists of three spans supported on two single-column piers and will be the first built bridge in the world in which superelastic shape memory alloy (SMA) and engineered cementitious composite (ECC) are implemented to reduce damage at plastic hinges and minimize residual displacements. Existing finite-element formulations in the finite-element software OpenSees are used to capture the response of the advanced materials used in the bridge. The earthquake induced by strike-slip fault was assumed to produce a surface rupture across the SR99 Bridge. The effect of the rupture was modeled by a static, differential ground displacement in the fault-parallel direction across the rupture. The synthetic suite of scaled bidirectional near-fault ground motions used in the analysis contains common near-fault features including a directivity pulse in the fault-normal direction and a fling step in the fault-parallel direction. Comparisons are made on behavior of two different bridge types. The first is a conventional reinforced concrete bridge and the second is a bridge with Nickel-Titanium (NiTi) SMA reinforcing bar at the plastic hinge zone and ECC in the whole column. Fault-parallel near-fault earthquakes typically exhibit a static permanent ground displacement caused by the relative movement of the two sides of the fault. When the fault is located between piers, the pier shows a higher demand. Fault-normal analysis results show effectiveness of the innovative interventions on the bridges in providing excellent recentering capabilities with minimal damage to the columns. But the maximum drift computed in the SMA bridge is slightly higher than reinforced concrete (RC) bridges, contributed by comparatively low stiffness of the superelastic SMA bars compared to the steel reinforcing bars.
url http://dx.doi.org/10.1155/2018/4276167
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