A Methodology for the Experimental Evaluation of Seismic Pounding at Seat-Type Abutments of Horizontally Curved Bridges

Wieser, Joseph; Zaghi, Arash E.; Maragakis, Manos; Buckle, Ian G.

doi:10.1061/9780784412367.055

Cited by 12 publications

(9 citation statements)

References 9 publications

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“…Inspired by the FHWA Design Example #6, the benchmark bridge was designed as the prototype for the recent shake table experiments performed at the University of Nevada, Reno (Wieser et al, 2012). The three-span, continuous, steel plate girder superstructure measures 362.5 ft. in length along its centerline.…”

Section: Benchmark Bridgementioning

confidence: 99%

Seismic Performance of Highway Bridges with Seat-Type Abutments Subjected to Near-Fault Ground Motions

Wieser¹,

Maragakis²

2013

Structures Congress 2013

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Seat-type bridge abutments consisting of expansion gaps and sacrificial shear keys significantly affect the response of bridge during strong earthquakes. Seismic pounding between the bridge deck and the abutment backwall caused by expansion gap closure may alter the dynamic characteristics consequently affecting the demands on various bridge components. Additionally, the loss of sacrificial abutment shear keys changes the support boundary condition and may significantly increase the demands on the bridge piers. A small scale parameter study investigates the influence of ground motion and bridge curvature on the performance of seat-type bridge abutments. Straight and highly curved configurations of a benchmark bridge are subjected to two suites of motions, on set with and the other without large velocity pulses. The vulnerability of the bridge configurations are compared using component fragility analysis. It is shown that bridges are more vulnerable to ground motions with large velocity pulses and that curved bridges are more likely to experience column damage and abutment unseating compared to straight bridges.

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Section: Benchmark Bridgementioning

confidence: 99%

Seismic Performance of Highway Bridges with Seat-Type Abutments Subjected to Near-Fault Ground Motions

Wieser¹,

Maragakis²

2013

Structures Congress 2013

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“…The first experimental study, on curved bridges, was conducted in 2014 to observe and analysis the rotation of segmental curved bridges, the governing mechanics and the pounding failure patterns. 8,9 However, a proper thorough analytical analysis on the pounding of curved bridges is very limited; whereas, straight and skew bridges have a significant amount of studies in the current literature. 4,[10][11][12][13][14][15][16][17][18][19][20] Therefore, analysing the impact behaviour of the S-oriented curved bridges is a first and this study aims to fill a very important gap in the literature.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2017

FMRIJ

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Structures lying in close proximity experience multi-body dynamics, the impact phenomenon of which is known as pounding. This may lead to deck-unseating or in-plane deck rotation, phenomenon usually observed during high seismic activities. This leads to the important aspect of calculating the possibility of stick and slip to understand the safety of the design. The calculation is carried out by employing a linear complementarity in both the linear and tangential directions for observing the interaction between the two decks, which are considered to be rigid. The various conditions of the pre-impacting parameters, for all the possible stick-stick combinations, in the case of single impact are analytically determined. It is observed that the rotational potential of the deck, in-plane, is present for curved bridges having S-type configuration and needs to be considered while designing.

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“…Guo et al (2009) carried out a series of shaking table tests on a 1:20 scaled base-isolated bridge model to investigate the effects of pounding on the response of the structures subjected to earthquake ground motions and pounding mitigation by using magneto-rheological (MR) dampers. A 2:5 scale curved bridge model was constructed to be tested on the four shake tables by Wieser et al (2012) to study the poundings at the abutments with an equivalent nonlinear backfill soil during strong earthquakes. It should be noted that all the above studies neglected the spatially varying ground motions.…”

Section: Introductionmentioning

confidence: 99%

Experimental and three-dimensional finite element method studies on pounding responses of bridge structures subjected to spatially varying ground motions

Shrestha

Hao

et al. 2016

Advances in Structural Engineering

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Pounding and unseating damages to bridge superstructures have been commonly observed in many previous major earthquakes. These damages can essentially attribute to the large closing or opening relative displacement between adjacent structures. This paper carries out an experimental study on the pounding responses of adjacent bridge structures considering spatially varying ground motions by using a shaking table array system. Two sets of large scale (1:6) bridge models involving two bridge frames were constructed. The bridge models were subjected to the stochastically simulated ground motions in bi-direction based on the response spectra of Chinese Guideline for Seismic Design of Highway Bridge for three different site conditions, considering three coherency levels. Two types of boundary conditions, i.e., the fixed foundation and rocking foundation, were applied to investigate the influence of the foundation type. In addition, a detailed 3D finite element model was constructed to simulate an experimental case. The non-linear material behavior including strain rate effects of concrete and steel reinforcement is included. The applicability and accuracy of the finite element model in simulating bridge pounding responses subjected to spatially varying ground motions are discussed. Experimental and numerical results demonstrate that non-uniform excitations and foundation rocking can affect the relative displacements and pounding responses significantly.

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A Methodology for the Experimental Evaluation of Seismic Pounding at Seat-Type Abutments of Horizontally Curved Bridges

Cited by 12 publications

References 9 publications

Seismic Performance of Highway Bridges with Seat-Type Abutments Subjected to Near-Fault Ground Motions

Seismic Performance of Highway Bridges with Seat-Type Abutments Subjected to Near-Fault Ground Motions

Untitled

Experimental and three-dimensional finite element method studies on pounding responses of bridge structures subjected to spatially varying ground motions

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