Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Low-cycle fatigue performance of steel h-piles in integral bridges
Download
index.pdf
Date
2014
Author
Karalar, Memduh
Metadata
Show full item record
Item Usage Stats
181
views
159
downloads
Cite This
Integral bridges are jointless bridges where the superstructure is connected monolithically with the abutments. Due to seasonal temperature changes the abutments are pushed against the approach fill and then pulled away, causing lateral displacements at the top of the piles that support the abutments. This may result in the reduction of their service life due to low-cycle fatigue effects. In this research, both analytical and experimental studies are conducted to investigate the effect of thermal induced cyclic displacements/strains on the low cycle fatigue performance of steel H-piles at the abutments of integral bridges. First, a new cycle counting method is developed to determine the number and amplitude of large and small pile displacement/strain cycles due to seasonal and daily temperature fluctuations. Then, a new equation is developed to determine a displacement/strain cycle amplitude representative of a combination of a number of small and large amplitude cycles existing in a typical temperature induced displacement/strain history in steel H-piles of integral bridges. Then, nonlinear finite element models (FEMs) of the steel H-pile specimens used in the experimental part of this research study are developed using the computer program ANSYS. Next, FEM of these test specimens are subjected to a loading similar to that is used in the experimental testing. The main purpose of conducting such nonlinear analyses is to identify potential problems that may be encountered during testing and to improve the test apparatus if necessary. Low cycle fatigue tests are then conducted to investigate the fatigue life of steel H-piles subjected to thermal induced cyclic strains/displacements. The tests are designed to study the effect of several parameters, namely; (i) pile size (ii) equivalent length of the pile, (iii) orientation of the pile (strong axis or weak axis bending), (iv) small amplitude cycles (displacement history with and without small amplitude cycles), iv) amplitude of the small displacement/strain cycles with respect to that of large displacement/strain cycles and (vi) the magnitude of the axial load applied on the pile. Furthermore, nonlinear FEMs of the steel H-pile specimens are developed using the program ANSYS to numerically predict their low cycle fatigue performance under cyclic thermal induced displacements/strains. .
Subject Keywords
Bridges
,
Bridges
,
Piling (Civil engineering).
,
Steel
URI
http://etd.lib.metu.edu.tr/upload/12618008/index.pdf
https://hdl.handle.net/11511/23914
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
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...
Effect of vehicular and seismic loads on the performance of integral bridges
Erhan, Semih; Dicleli, Murat; Department of Engineering Sciences (2011)
Integral bridges (IBs) are defined as a class of rigid frame bridges with a single row of piles at the abutments cast monolithically with the superstructure. In the last decade, IBs have become very popular in North America and Europe as they provide many economical and functional advantages. However, standard design methods for IBs have not been established yet. Therefore, most bridge engineers depend on the knowledge acquired from performance of previously constructed IBs and the design codes developed fo...
Simulation of low cycle fatigue performance of steel H piles via finite element approach
Karalar, Memduh; Dicleli, Murat (2016-06-30)
Integral bridges are jointless bridges where the superstructure is connected monolithically with the abutments. Due to seasonal temperature changes the abutments are pushed against the approach fill and then pulled away, causing lateral displacements at the top of the piles that support the abutments as shown in Fig. 1. This may result in the reduction of their service life due to low-cycle fatigue effects. Although bridge engineers (Dicleli, 2000, French et al. 2004) have already predicted that low cycle f...
Improved Seismic Response of Multisimple-Span Skewed Bridges Retrofitted with Link Slabs
Sevgili, Gizem; Caner, Alp (American Society of Civil Engineers (ASCE), 2009-11-01)
Results of a recent bridge inventory evaluation indicated that about 50% of Turkish highway bridges have more than 30 degrees of skew angle and can be classified as irregular bridges. During the recent major earthquake in Turkey, multisimple-span bridges with continuous decks and link slabs performed well even though these bridges were in the vicinity of the fault line. This study aims to evaluate the improvements in seismic response of skew bridges in terms of forces and displacements when link slabs are a...
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...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
M. Karalar, “Low-cycle fatigue performance of steel h-piles in integral bridges,” Ph.D. - Doctoral Program, Middle East Technical University, 2014.