International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 8, Issue 1, pp: (173-181), Month: April 2020 - September 2020, Available at: www.researchpublish.com
Condition Assessment and Deterioration Prediction of RC Structures Ahmed Mohammed Abdelalim 1, Nahla Ali Mohamed fahmy 2, Hatem Hamdy Ghith 3, Alaa Gamal sheriff 4 (1)
Associate Professor of Project Management, faculty of engineering at Mataria, Helwan University, Cairo, Egypt. (2) (3) (4)
Assistant Lecturer at Housing and Building National Research Center, Cairo, Egypt.
Professor of R.C Structure Housing and Building National Research Center, Cairo, Egypt.
Professor of R.C Structures, faculty of engineering at Mataria, Helwan University, Cairo, Egypt.
Abstract: Condition assessment is very important to determine the best repair action but it is not an easy to evaluate the condition of a structure accurately because of the assessment of an existing structure usually suffers from the limited data and imprecise theoretical models, also because of any experiment or test on an existing structure need to be non-destructive test. Infrastructure is suffered from continuous ageing effects. Deterioration or degradation is inevitable process for all building elements. The main problem is how they deteriorate and at what rate. Reliable inspection and observation tools are therefore an increasing demand. The diagnosis and the evaluation of current conditions and residual service life of existing structures are key aspects of concrete structure management. This paper discusses predicting surface condition of each element during building service life and over all building condition by using a Marcovian model. The condition assessment accurately evaluates the effect of building elements, depending on the current condition assessment; the proposed deterioration model predicts the future deterioration of the elements for each year in the building life cycle. As follows, the present and the future deteriorations are monitored by the proposed framework and used to get the best repair options. Keywords: Condition assessment, Marcovian model, service life, building life cycle, element deterioration, deterioration index, future deteriorations, rehabilitation.
1. INTRODUCTION Life-cycle assessment and evaluation methods can be beneficially used to assess existing structures: actions on structures, inspection-oriented design and construction, characteristics of elements and overall performance of structures. Safety assessment and the structure performance of a structure over its life cycle are important factors which have to be considered. Safety assessment of engineering works must be conducted by examining their behavior and all possibilities of failure which can be appeared (Kurz et al., 2012). A reliable diagnosis of the condition and behavior of a structure is an important basis for an effective service life management. In order to determine proper in time for repair in the life-time of a structure, the deterioration process at exposed regions as well as a detailed knowledge about the current condition of the whole structure is essential (Council et al., 2009). To predict the deterioration of the element, its probability of transition from one condition state to another should be accumulated over discrete time intervals. To predict the deterioration of the element, its probability of transition from one condition state to another should be accumulated over discrete time intervals. In this model, a transition probability matrix was developed. Markovian deterioration model is based on the concept of defining states in terms of building condition ratings and obtaining the probabilities of a building condition changing from one state to another. It should be noted that the transition matrix (and accordingly, the deterioration behavior) is greatly affected by the service condition (or the environment) to which the building element is exposed (Singh Ahluwalia, 2008). In case of RC buildings, applying Marcov chain (probability matrix) to predict surface condition of concrete for each element (column, beam and slab) and Total degradation index of the building will be discussed.
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