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Behavior of High-Strength Bolted Connections in Corrosive Environmental Conditions

Mehditabar, Mohammad Reza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57821 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moazezi Mehretehran, Alireza
  7. Abstract:
  8. Steel connections are constantly exposed to strength degradation due to corrosion. The extent of this reduction varies based on preventive measures and environmental corrosion severity. To more accurately evaluate the performance of bolted steel structures in corrosive conditions, it is necessary to define the behavior of corroded bolted connections and incorporate it into structural analyses. A literature review in this area reveals that most previous studies have focused on the behavior of structural members, with very few addressing the impact of pitting corrosion on connections. Therefore, this research aims to examine the performance of bearing connections under pitting corrosion and to present a relationship corresponding to the reduction in load-bearing capacity, which can serve as a reference for assessing the safety of bolted connections in an in-service steel frame. In this study, corrosion modeling in ABAQUS was conducted using a random distribution of pits generated by a Python code. The study analyzes all failure modes of bearing connections and the impact of corrosion on their behavior by accurately modeling failure states and connection failure mechanisms in the software. Results indicate that varying pit distributions, even with constant corrosion characteristics and volume, can alter the failure mode, load-bearing capacity, and ductility of the connection. Subsequently, changes in load-bearing capacity were reported concerning the increase in pit density and depth. Finally, based on the volume loss ratio in the connection plate, three equations were proposed to estimate the final load-bearing capacity of the connection, representing the lower bound, linear regression, and upper bound of the predictive model. Additionally, a separate section investigates the effect of uniform corrosion on slip-critical connections, showing that corrosion reduces the slip coefficient, critical slip resistance, and ultimate slip load in bolted connections, and also affects the yield strength, ultimate strength, and ductility of steel materials
  9. Keywords:
  10. Pitting Corrosion ; Ultimate Bearing Capacity ; Failure Modes ; Slip Coefficient ; Slip Load ; Volume Loss Ratio ; Ultimate Slip Load

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