Corrosion of Steel Piles Driven in Soil Deposits

This chapter is based on ecological information on 82 radio-tagged badgers (39 F, 43 M) among three study populations in British Columbia, Canada between 1996 and 2010, data that were collected to learn more about the ecology of badgers and consider how variation in their ecology might inform regional conservation strategies. The widely spaced, lower density prey and distribution of soil deposits suitable for digging in British Columbia likely required badgers to use substantially larger areas, relative to the core range, in which to acquire sufficient energy to survive and reproduce. Strikes from automobiles were the primary cause of death among all radio-tagged badgers and this source of mortality is pervasive throughout the limited distribution of badgers in British Columbia. Despite their potential for high fecundity, populations of badgers in British Columbia likely remain at considerable risk compared to those in the core of the species’ range.

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Influence of the Welded Joint on the Mechanical Behavior of Steel Piles during Static and Dynamic Deformation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.345-346.1469 ◽

2007 ◽

Vol 345-346 ◽

pp. 1469-1472

Author(s):

Gab Chul Jang ◽

Kyong Ho Chang ◽

Chin Hyung Lee

Keyword(s):

Residual Stress ◽

Stress Distribution ◽

Mechanical Behavior ◽

Welded Joint ◽

Dynamic Deformation ◽

Three Dimensional ◽

Steel Structures ◽

Residual Stress Distribution ◽

Dynamic Mechanical Behavior ◽

Steel Piles

During manufacturing the welded joint of steel structures, residual stress is produced and weld metal is used inevitably. And residual stress and weld metal influence on the static and dynamic mechanical behavior of steel structures. Therefore, to predict the mechanical behavior of steel pile with a welded joint during static and dynamic deformation, the research on the influence of the welded joints on the static and dynamic behavior of steel pile is clarified. In this paper, the residual stress distribution in a welded joint of steel piles was investigated by using three-dimensional welding analysis. The static and dynamic mechanical behavior of steel piles with a welded joint is investigated by three-dimensional elastic-plastic finite element analysis using a proposed dynamic hysteresis model. Numerical analyses of the steel pile with a welded joint were compared to that without a welded joint with respect to load carrying capacity and residual stress distribution. The influence of the welded joint on the mechanical behavior of steel piles during static and dynamic deformation was clarified by comparing analytical results

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Relationship model between surface strain of concrete and expansion force of reinforcement rust

Scientific Reports ◽

10.1038/s41598-021-83376-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Fanxiu Chen ◽

Zuquan Jin ◽

Endong Wang ◽

Lanqin Wang ◽

Yudan Jiang ◽

...

Keyword(s):

Reinforced Concrete ◽

Real Time ◽

Steel Corrosion ◽

Surface Strain ◽

Concrete Cracking ◽

Whole Process ◽

Steel Bars ◽

Relationship Model ◽

Expansion Force ◽

Corrosion Of Steel

AbstractConcrete cracking caused by corrosion of reinforcement could significantly shorten the durability of reinforced concrete structure. It remains critical to investigate the process and mechanism of the corrosion occurring to concrete reinforcement and establish the theoretical prediction model of concrete expansion force for the whole process of corrosion cracking of reinforcement. Under the premise of uniform corrosion of reinforcing steel bars, the elastic mechanics analysis method is adopted to analyze the entire process starting from the corrosion of steel bars to the cracking of concrete due to corrosion. A relationship model between the expansion force of corrosion of steel bars and the surface strain of concrete is established. On the cuboid reinforced concrete specimens with square cross-sections, accelerated corrosion tests are carried out to calibrate and verify the established model. The model can be able to estimate the real-time expansion force of reinforced concrete at any time of the whole process from the initiation of steel corrosion to the end of concrete cracking by measuring the surface strain of concrete. It could be useful for quantitative real-time monitoring of steel corrosion in concrete structures.

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Corrosion of Steel Rebars in Anoxic Environments. Part II: Pit Growth Rate and Mechanical Strength

Materials ◽

10.3390/ma14102547 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2547

Author(s):

Elena Garcia ◽

Julio Torres ◽

Nuria Rebolledo ◽

Raul Arrabal ◽

Javier Sanchez

Keyword(s):

Mechanical Strength ◽

Chloride Content ◽

Element Model ◽

Offshore Structures ◽

Anoxic Environments ◽

Electrochemical Parameters ◽

Cathode Area ◽

Optical Profilometer ◽

Set Up ◽

Corrosion Of Steel

Reinforced concrete may corrode in anoxic environments such as offshore structures. Under such conditions the reinforcement fails to passivate completely, irrespective of chloride content, and the corrosion taking place locally induces the growth of discrete pits. This study characterised such pits and simulated their growth from experimentally determined electrochemical parameters. Pit morphology was assessed with an optical profilometer. A finite element model was developed to simulate pit growth based on electrochemical parameters for different cathode areas. The model was able to predict long-term pit growth by deformed geometry set up. Simulations showed that pit growth-related corrosion tends to maximise as cathode area declines, which lower the pitting factor. The mechanical strength developed by the passive and prestressed rebar throughout its service life was also estimated. Passive rebar strength may drop by nearly 20% over 100 years, whilst in the presence of cracking from the base of the pit steel strength may decline by over 40%.

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