Juniper Publishers Journal Of Civil Engineering

  Civil Engineering Research Journal- Juniper Publishers   Abstract It is important in structural design to efficiently maintain safety, sustainability and stability of structures and therefore, using liquid dampers (LD) to control structural vibrations became popular in engineering design. Due to the nonlinear mechanism of the liquid, the behavior of the LD is very complicated when undergoing strong ground motion. This review focuses on what published research studies, within the field of structural vibration control systems, having accomplished and more specifically, the behavior of the sloshing water and the overall efficiency of the LD as a vibration control system. Keywords:  Liquid damper; Water tank; Vibration control; Wind response; Strong ground motion; Earthquakes Go to Introduction Tuned Liquid Damper (TLD) is an auxiliary passive control system that can be used in different structural design applications, such as high -rise buildings, bridges and offshore oil platforms to r

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 Civil Engineering Research Journal- Juniper Publishers   Abstract Dolomitic limestone test samples with increasing levels of damage were obtained by exposing limestone samples to temperature levels of 100°C, 200°C, 300°C, 500°C, 600°C, and 700°C for a period of 90 minutes. The samples were then nondestructively tested using nonlinear ultrasonic in the form of a non-collinear ultrasonic wave mixing approach. In addition, the test samples’ degradation of flexure strength due to damage accumulation caused by the exposure to increasing levels of temperature was also obtained using four-point bending tests. Results using the currently used non-collinear ultrasonic wave mixing approach correlate well (R2 = 92%) with the corresponding obtained reduction in strength, and with results obtained using different transducer arrangements. The approach has potential applications including quantitative evaluation of damage in stone artifacts and well as to evaluate fire-induced damage in stone infras

 Civil Engineering research Journal- Juniper Publishers   Abstract Composite materials including fiberglass and carbon fiber together with the necessary strength provide a sufficient saving the weight for structures of any shape and allow to realize unique characteristics due to their application are finding wider application in the creation of structures. This requires the development of a reliable non-destructive method for assessing their condition, including during operation, what is of no less importance since it allows to reject materials with defects even before structural elements are made of them. The evaluation of possibility to use the acoustic emission (AE) scanning method based on EMA type equipment for fiberglass specimens was conducted. Numerous experiments were performed on scanning specimens in the longitudinal direction, in which each of the AE sensors alternately acted as an emitter of test signals. Of the six specimens tested, three contained an integrated center el