مورد إلكتروني
The Effect of Stress Changes on Wave Velocity: Application of Stress Measurement in a Concrete Medium
| العنوان: | The Effect of Stress Changes on Wave Velocity: Application of Stress Measurement in a Concrete Medium |
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| بيانات النشر: | 2021-08-11 |
| تفاصيل مُضافة: | Ouali, Mouad (author) |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | The Dutch infrastructure counts many bridges, the majority of which are built in concrete. These bridges have been designed and constructed according to safety codes. A lot of these bridges date from the previous century and have been designed conform outdated safety codes. Therefore, the main problem of these bridges is the uncertainty with regard to their structural health as well as their performance under the current loading conditions. The application of ‘smart aggregates’ could potentially solve these issues. Smart aggregates refer to a network of sensors that emit and receive wave signals inside the concrete structure. These sensor are embedded within the concrete and can be implemented in both new and existing structures. The changes in the medium with regard to the stresses are reflected by the phase changes of the wave signal measured by the smart aggregates. This information allows for the monitoring of the conditions of the bridge during its lifespan. The magnitude of the stress in certain parts of the structure could then indicate the need for maintenance at an early stage, thus preventing unnecessary maintenance while preserving the safety of the bridge. This method, however, requires a thorough understanding of the wave propagation inside a concrete medium subjected to a stress state. This thesis investigates how the relative wave-velocity change of a concrete-like medium is influenced by the stresses to which it is subjected. Throughout the report this relation is referred to as the acoustoelastic effect. The first part of the thesis is centered around the theoretical formulation of the acoustoelastic effect. During this study, the models of Murnaghan and Biot have been studied. Subsequently, their differences with respect to the fundamental assumptions have been indicated. Here, it has been found that the main difference between the two models is demonstrated by the way they regard the second-order deformation terms. Murnaghan assumed th Civil Engineering | Structural Engineering | Concrete Structures |
| مصطلحات الفهرس: | Concrete, Smart Aggregates, Coda Wave Interferometry, Structural Health Monitoring (SHM), Dynamics, Wave Propagation, Wave velocity, Stress wave propagation, Acoustoelastic effect, master thesis |
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| الإتاحة: | Open access content. Open access content © 2021 Mouad Ouali |
| ملاحظة: | English |
| أرقام أخرى: | NLTUD oai:tudelft.nl:uuid:722d752e-b488-4aa4-9577-7a84a47457b0 1358871804 |
| المصدر المساهم: | DELFT UNIV OF TECHNOL From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.on1358871804 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |