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Related Concept Videos

Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
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Non-destructive Tests for Concrete Strength01:12

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The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Prestressed Concrete01:20

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Prestressed concrete is a construction technique designed to enhance the strength and durability of concrete structures. This method involves the application of a pre-set tension to high-strength steel strands used as reinforcement before the concrete is subjected to its working loads. The primary aim of prestressing is to place the concrete in a state of compression, in order to counteract the tensile forces it will experience in service. This pre-compression helps prevent crack formation in...
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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Related Experiment Video

Updated: Jan 16, 2026

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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Real-Time Structural Health Monitoring of Reinforced Concrete Under Seismic Loading Using Dynamic OFDR.

Jooyoung Lee1, Hyoyoung Jung1, Myoung Jin Kim1

  • 1Korea Photonics Technology Institute (KOPTI), Gwangju 61007, Republic of Korea.

Sensors (Basel, Switzerland)
|September 27, 2025
PubMed
Summary

This study introduces a dynamic optical frequency domain reflectometry (D-OFDR) system for precise, real-time structural health monitoring. The D-OFDR platform effectively detects seismic-induced damage in reinforced concrete structures before visible cracks appear.

Keywords:
distributed strain sensingdynamic optical frequency domain reflectometryreinforced concrete columnseismic resonance trackingstructural health monitoring

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Area of Science:

  • Structural Engineering
  • Optical Sensing Technologies
  • Materials Science

Background:

  • Structural health monitoring (SHM) is crucial for assessing infrastructure integrity, especially under seismic loads.
  • Traditional sensors have limitations in distributed sensing and early damage detection.
  • Optical frequency domain reflectometry (OFDR) offers potential for high-resolution strain measurement.

Purpose of the Study:

  • To develop and validate a compact dynamic optical frequency domain reflectometry (D-OFDR) platform for millimeter-scale, distributed strain sensing.
  • To enable real-time structural health monitoring of reinforced concrete structures subjected to seismic loading.
  • To demonstrate the system's capability in detecting seismic-induced damage prior to visible cracking.

Main Methods:

  • A D-OFDR interrogator with a dual-interferometer architecture (main for sensing, auxiliary for compensation).
  • High-speed data acquisition using a dual-channel FPGA-based DAQ board.
  • A dual-edge triggering scheme with a 50 Hz bidirectional sweep for a 100 Hz interrogation rate.

Main Results:

  • Laboratory validation on steel beams showed high frequency fidelity (0.09 Hz error) compared to strain gauges.
  • Shake-table tests on a 2m RC column revealed distinct damage regimes under seismic excitations.
  • Distributed strain data showed a frequency reduction from 3.82 Hz to 1.48 Hz, indicating stiffness degradation and yielding.

Conclusions:

  • The bidirectional sweep-triggered D-OFDR method provides enhanced real-time monitoring capabilities.
  • This technology significantly outperforms traditional point sensors for early and precise seismic damage detection.
  • The D-OFDR platform is effective for SHM of reinforced concrete structures under seismic events.