Fatigue Life Assessment of Integral Concrete Bridges with H Cross-Section Steel Piles Mounted in Water
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TECHNICAL ARTICLE—PEER-REVIEWED
Fatigue Life Assessment of Integral Concrete Bridges with H Cross-Section Steel Piles Mounted in Water H. Abdollahnia . M. H. Alizadeh Elizei . K. Reza Kashyzadeh
Submitted: 15 February 2020 ASM International 2020
Abstract The main aim of the present research is to predict the fatigue life of H cross-section steel piles of an integral concrete bridge that is mounted in the sea. To achieve this purpose, the geometric model of the bridge with a 90 m length including 42 numbers of steel piles was designed using CATIA software. Next, two different stress analyses including static analysis (in order to study the effect of motionless water) and transient dynamic analysis (in order to study the effect of sea waves clash) were performed for extracting the total deformation on the top part of the piles. The finite element results indicated that motionless water has no significant effect on the mechanical behavior of the bridge piles. But the sea waves clash with the piles caused a deformation on the piles. Eventually, the fatigue life of the H cross-section steel pile subjected to the sea waves clash was predicted using two different techniques (finite element simulation and probabilistic approach). The results reveal that the motionless water has no ability to cause fatigue damage to the different parts of an integral concrete bridge. Moreover, it is found that the useful lifetime of steel piles under variable amplitude loading caused by sea waves clash is 39 and 34 years based on the FE and probabilistic analyses, respectively.
H. Abdollahnia M. H. Alizadeh Elizei Department of Civil Engineering, Roudehen Branch, Islamic Azad University, Roudehen, Iran K. Reza Kashyzadeh (&) Department of Mechanical and Instrumental Engineering, Academy of Engineering, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, Moscow, Russian Federation 117198 e-mail: [email protected]; [email protected]
Keywords Axial fatigue Variable amplitude loading Sea waves Integral concrete bridge H-steel piles Finite element analysis
Introduction The use of integral concrete bridges has widely increased more and more because of the superiority of this type of structure against metal bridges and the problems caused by shrinkage and expansion phenomena under temperature variations. Moreover, the bridges can be affected by different loads depending on the different climatic zones and environmental conditions. Therefore, the knowledge of the behavior of these structures under regional conditions is one of the design considerations for civil and structural engineers. Since the bridge mounted in water is directly affected by water loading (due to oscillatory loads caused by sea or river waves), the strength examination of these types of structures is very important from the fatigue point of view. Also, it should be noted that the fatigue life of structures should be longer than their service life. On the other hand, if the bridge piles are in a completely c
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