Seismic Testing of a Two-Span Reinforced Concrete Bridge

Johnson, Nathan; Ranf, Richard T.; Saiidi, Mehdi S.; Sanders, David H.; Eberhard, Marc O.

doi:10.1061/(asce)1084-0702(2008)13:2(173)

Cited by 77 publications

(48 citation statements)

References 4 publications

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“…During this run, some of the bridge columns approached failure but there was no steel bar rupture. The measured data showed a major shift in the location of the most critical pier compared to an identical bridge mode that had been subjected to uniform motion [7]. The pier that was the least damaged under uniform ground motion suffered the largest damage in the case of shaking that simulated fault-rupture.…”

Section: Introductionmentioning

confidence: 93%

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

Saiidi

2018

Shock and Vibration

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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 singlecolumn 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.

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Section: Introductionmentioning

confidence: 93%

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

Saiidi

2018

Shock and Vibration

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“…Furthermore, the shaking table tests include a variety of excitation types such as uniform and multi-support excitations. Table I shows the procedure of the tests subjected to the white noise, uniform, and multi-support excitations with PGA up to 0.38 g [21]. It is noted that it is impossible for the three shaking tables to produce exactly the same ground motion for the uniform excitation cases, as seen in the measured PGAs in Table I.…”

Section: Input Ground Motionsmentioning

confidence: 99%

“…The structure is densely instrumented with various sensors to obtain time history response measurements including slab and table displacements, accelerations, column curvatures and reinforcement strains [20,21]. Figure 1 shows the accelerometer layout on the bridge structure.…”

Section: Bridge Model and Sensor Layoutmentioning

confidence: 99%

SHM‐integrated bridge reliability estimation using multivariate stochastic processes

Feng

Soyöz

2014

Earthq Engng Struct Dyn

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SUMMARYDetermination of response characteristics using probabilistic approaches is essential to deal with high level of load and resistance uncertainties in civil engineering structures. Multi-span bridges present a significant problem regarding the varying nature of seismic loads on different bridge piers. With an emphasis on comparison of multi-support excitation with the conventional uniform excitation, this paper aims at providing a framework to evaluate probabilistic seismic response and estimate reliability of bridges under multi-support excitations simulated by multivariate stochastic processes. Moreover, the framework integrates the experimental data of a multi-support seismic shaking table test of a multi-span bridge structure as well as structural health monitoring (SHM) findings based on vibration measurements. The results demonstrate the importance of the multivariate stochastic processes, therefore, multi-support excitation, on estimating seismic behavior of multi-span bridges. Furthermore, this study proves the significance of structural parameter updating with respect to the evaluation of structural reliability. It is observed that the difference between the SHM-integrated and the conventional reliability estimation results vary according to the change in bedrock conditions.

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“…A quarter-scale, two-span reinforced concrete bridge model was tested on three shake tables at UNR in 2005 ( Figure 19) (Johnson et al 2008a, Cruz et al 2009). Each pier consisted of two round columns.…”

Section: Bridge Systemsmentioning

confidence: 99%

Managing seismic performance of highway bridges – evolution in experimental research

Saiidi

2011

Structure and Infrastructure Engineering

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The utilisation of experimental testing data to understand and improve the seismic performance of bridge structures is relatively new. Fifty-two years ago at a meeting of world experts and researchers of earthquake engineering, field observation was the only assessment technique that was discussed with respect to verification of design in physical structures, and laboratory tests were not included in the article. This article shows the evolution in seismic experimental studies and how it was triggered by the 1971 San Fernando Earthquake. Different aspects and examples of component, subsystem, and system testing are discussed. An overview of the seismic retrofit methods and a few examples of seismic repair methods are presented. A discussion of the utilisation of innovative materials such as shape memory alloys to improve the seismic performance and serviceability of bridges after strong earthquakes is also presented.

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Seismic Testing of a Two-Span Reinforced Concrete Bridge

Cited by 77 publications

References 4 publications

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

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

SHM‐integrated bridge reliability estimation using multivariate stochastic processes

Managing seismic performance of highway bridges – evolution in experimental research

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