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Dynamically loaded concrete structures – monitoring‐based assessment of the real degree of fatigue deterioration
Author(s) -
Urban Susanne,
Strauss Alfred,
Schütz Robert,
Bergmeister Konrad,
Dehlinger Christian
Publication year - 2014
Publication title -
structural concrete
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 34
eISSN - 1751-7648
pISSN - 1464-4177
DOI - 10.1002/suco.201300095
Subject(s) - structural engineering , degree (music) , process (computing) , computer science , reinforced concrete , code (set theory) , engineering , acoustics , physics , set (abstract data type) , programming language , operating system
When it comes to dynamically loaded concrete structures, determining the real degree of fatigue damage of a structure on site is a very demanding process that has not been explored in depth. Calculation concepts according to current codes and specifications (e.g. fib Model Code for Concrete Structures 2010 [1]) do not offer efficient results for this task. However, the permanent monitoring from the erection of a structure up to the end of its lifetime is seen as a very promising possibility for assessing the degree of damage constantly. This article takes a closer look at the concrete fatigue concept of fib Model Code 2010 [1], shows an FE simulation of a time‐dependent fatigue process for an offshore wind turbine foundation and presents a fatigue monitoring concept including laboratory tests, which enables the detection of the real degree of deterioration in a concrete structure. During tests, the use of ultrasound was identified as the most appropriate method. Measuring wave velocity enables the determination of the dynamic E‐modulus, which correlates to the degree of damage within the cross‐section of the structure considered.