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Low Cycle Fatigue Effects in Integral Bridge Piles Under Seismic Load
Date
2010-08-30
Author
Dicleli, Murat
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Under the effect of medium and large intensity ground motions, the seismically-induced lateral cyclic displacements in steel H-piles of integral bridges (IBs) could be considerable. As a result, the piles may experience cyclic plastic deformations following a major earthquake. This may result in the reduction of their service life due to low-cycle fatigue effects. Accordingly, low cycle fatigue in integral bridge piles is investigated under seismic effects in this study. For this purpose, IBs with two spans are considered. Three dimensional nonlinear structural models of these IBs including dynamic soil-bridge interaction effects are built. Then, time history analyses of the IB models are conducted using a set of ground motions with various intensities representing small, medium and large intensity earthquakes. In the analyses, the effect of various properties such as soil stiffness, pile size and orientation are considered. The magnitude of cyclic displacements of steel H piles are then determined from the analyses results. In addition, using the existing data from experimental tests of steel H-piles, a fatigue damage model is formulated. This fatigue damage model is used together with the cyclic displacement obtained from seismic analyses to determine the remaining service life of IBs under cyclic displacement due to thermal effects. The fatigue analyses results reveals that earthquakes with large intensity may reduce the service life of the piles with non-compact sections.
Subject Keywords
Integral bridge
,
Seismic
,
Low cycle fatigue
URI
https://hdl.handle.net/11511/76611
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Department of Engineering Sciences, Conference / Seminar
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Low cycle fatigue performance of integral bridge steel H-piles subjected to earthquakes
Dicleli, Murat (2014-11-26)
Under the effect of medium and large intensity ground motions, the seismically-induced lateral cyclic displacements in steel H-piles of integral bridges (IBs) could be considerable. As a result, the piles may experience cyclic plastic deformations following a major earthquake. This may result in the reduction of their service life due to low-cycle fatigue effects. Accordingly, low cycle fatigue in integral bridge piles is investigated under seismic effects in this study For this purpose, an IB with two span...
Low Cycle Fatigue Effects in Integral Bridge Steel H-Piles Under Earthquake Induced Strain Reversals
Dicleli, Murat (Springer, 2015-01-01)
Under the effect of medium and large intensity ground motions, the seismically-induced lateral cyclic displacements and ensuing bending strains in steel H-piles of integral bridges (IBs) could be considerable. As a result, the piles may experience cyclic plastic deformations following a major earthquake. This may result in the reduction of their service life due to low-cycle fatigue effects. Accordingly, low cycle fatigue in integral bridge piles is investigated under seismic effects in this study. For this...
Low cycle fatigue effects in integral bridge steel H-piles under seismic displacement reversals
Dicleli, Murat (IOS Press, 2013-12-01)
Under the effect of medium and large intensity ground motions, the seismically-induced lateral cyclic displacements in steel H-piles of integral bridges (IBs) could be considerable. As a result, the piles may experience cyclic plastic deformations following a major earthquake. This may result in the reduction of their service life due to low-cycle fatigue effects. Accordingly, low cycle fatigue in integral bridge piles is investigated under seismic effects in this study. For this purpose, IBs with two spans...
Effect of thermal induced flexural strain cycles on the low cycle fatigue performance of integral bridge steel H-piles
Karalar, Memduh; Dicleli, Murat (2016-10-01)
Close examination of the field measurement data for integral bridges revealed that the measured cyclic flexural strains in steel H-piles at the abutments due to thermal fluctuations consist of large amplitude, primary small amplitude and secondary small amplitude cycles. The effect of the small amplitude strain cycles on the low cycle fatigue life of these steel H-piles has not been extensively studied yet. Accordingly, to investigate the effect of the small amplitude strain cycles on the low cycle fatigue ...
Low-cycle fatigue in steel H-piles of integral bridges; a comparative study of experimental testing and finite element simulation
Karalar, Memduh; Dicleli, Murat (2020-01-10)
Integral abutment bridges (IABs) are those bridges without expansion joints. A single row of steel H-piles (SHPs) is commonly used at the thin and stub abutments of IABs to form a flexible support system at the bridge ends to accommodate thermal-induced displacement of the bridge. Consequently, as the IAB expands and contracts due to temperature variations, the SHPs supporting the abutments are subjected to cyclic lateral (longitudinal) displacements, which may eventually lead to low-cycle fatigue (LCF) fai...
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M. Dicleli, “Low Cycle Fatigue Effects in Integral Bridge Piles Under Seismic Load,” 2010, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/76611.
