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Identification of Damage Type and Location in Reinforced Concrete Piers of Slab– Beam Bridges Using Numerical Methods

Hemmati, Omid | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48199 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadizadeh, Mahdi
  7. Abstract:
  8. Bridges are among the crucial elements of transportation networks, and play an important role in facilitating emergency relief efforts following earthquakes. For this reason, it is emparative to monitor their damages to ensure about their performace in earthquakes. The structure of a bridge is divided into two parts, namely the superstructure and substructure. Due to the relatively high rigidity and strength of superstructures, most of structural damage is usually concentrated in substructures, which may ultimately affect the overall stability of the bridge. Therefore, assessing the level of damage in the substructure is of utmost concern. This research attempts to evaluate the damage in the piers of bridges. Among the different types of bridge structures, this project specifically focuses on the ordinary slab-beam bridges with relatively short span.The main approach in damage detection is visual inspection. However more detailed inspections are often needed for the assessment of the severity of the damage. In this study, a practical algorithm is suggested to estimate the severity of the damage through measurement of the dynamic response of bridges. The stiffness decrement is calculated to obtain an estimate of the amount of ductility consumed through damage in earthquakes. Besides, it is attempted to develop an approach that can be used to consider the effects of aftershocks and ensure that the damage will not be further extended in the piers during the relief period. Considering the uncertainty of the effective paramters and variables, the assessment of damage in piers is carried out probabilistically, to yield the actual precision of results obtained in regards to damage severity.It should be mentioned that while in the suggested approach ductility is shown to fairly indicate the amount of flexural damage, shear damage cannot be estimated as precisely, mainly due to the lack of reliable models for studying the shear capacity of concrete structures
  9. Keywords:
  10. Damage Detection ; Structural Health Monitoring ; Bridge Pier ; Probabilistic Methods ; Effective Moment of Inertia-Curvature

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