دانلود رایگان مقاله ارزیابی ریسک درباره تخمین مقاومت بتن با روش NDT و رویکرد سرواره مشروط – سال 2020
مشخصات مقاله:
عنوان فارسی مقاله:
ارزیابی ریسک درباره تخمین مقاومت بتن با روش NDT و رویکرد سرواره مشروط
عنوان انگلیسی مقاله:
Risk evaluation on concrete strength assessment with NDT technique and conditional coring approach
کلمات کلیدی مقاله:
استحکام بتن، تغییرپذیری بتن، هسته، ارزیابی درجا، دقت اندازه گیری، آزمایشات غیر مخرب، چکش برگشتی، خطر، سرعت پالس اولتراسونیک
مناسب برای رشته های دانشگاهی زیر:
مهندسی عمران
مناسب برای گرایش های دانشگاهی زیر:
سازه و مدیریت ساخت
وضعیت مقاله انگلیسی و ترجمه:
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فهرست مطالب:
Abstract
Keywords
1. Introduction
2. Revising the NDT strength assessment paradigm
2.1. The need to consider uncertainty
2.2. A risk-based approach for estimating mean concrete strength and local strength values
2.3. Risk curves
3. Research methodology and dataset generation
3.1. Research aims: optimal number of cores and advantages of conditional coring
3.2. Framework for the synthetic simulations and considered assumptions
4. Results of the simulation study
4.1. Effect of the most influencing parameters when considering random coring
4.2. Effect of the precision of test results
4.3. Efficiency of conditional coring in improving the quality of assessment
5. Prescribing a minimum number of cores compatible with a target assessment accuracy
5.1. Effect of the precision of test results
5.2. What is the required number of cores?
5.2.1. Looking at mean strength only
5.2.2. Looking at the local error on strength estimation
6. Conclusions
Funding
CRediT authorship contribution statement
Declaration of competing interest
References
قسمتی از مقاله انگلیسی:
Abstract
In-situ concrete strength assessment is commonly based on the implementation of NonDestructive Tests (NDT) and coring of several specimens for Destructive Tests (DT). The most widely used non-destructive (ND) techniques are rebound hammer and ultrasonic pulse velocity. From the resulting data of NDT and compressive strength test results on specimens, a conversion law is identified which can then be used to estimate the compressive strength at any location in the structure. Since this process is very sensitive to many uncertainty sources, recent RILEM recommendations have revised the assessment paradigm by considering it in a probabilistic framework. The challenge is no longer to estimate the true concrete strength, but to limit the risk of a wrong estimation within a certain admissible interval. In this context, it is shown how synthetic simulations are used to capture the main features of this problem and are a firm basis for justifying the relationship between the most influencing parameters and the quality of the assessment. In addition, the effect of conditional coring, which consists in the selection of coring positions on the basis of previous NDT results, is highlighted and quantified. Finally, the methodology that makes possible to define the required number of cores for a given target accuracy is presented.
