Dynamic properties of civil structures such as natural frequencies, damping ratios, and mode shapes are essential parameters for evaluating the health condition structures. However, dynamic prone to be biased by environmental effects which may lead fault structural assessment. To investigate effect on ballasted bridge, in this paper, a series vibration experiments were performed multi-span pre-...

Multiscale modeling for cement-based materials, such as concrete, is a relatively young subject, but there are already a number of different approaches to study different aspects of these classical materials. In this paper, the parameter-passing multiscale modeling scheme is established and applied to address the multiscale modeling problem for the integrated system of cement paste, mortar, and...

The development of native fish aquaculture represents an important alternative to mitigate ecological displacement generated by exotic fish. introduction in polyculture systems with high commercial value fishes has provided a useful strategy for sustainable development. present study aims provide information on tilapia, as species, and Dormitator latifrons, duo culture not programmed such. Usin...

The dynamical responses of railway track has been carried out by different ways. In this work, developing an analytical model for the ballasted which includes two rails connected to sleeper, a fast method calculated dynamic is presented. rail modelled as infinite beams posed on periodically supports are rested viscoelastic foundation. We consider equation in steady-state subjected moving loads....

To study the mechanical characteristics of ballasted bed under dynamic stability, a three-dimensional discrete element model with 1000 mm × 700 550 is established based on method. Meanwhile, simulation test bench same size built for analysis and experimental research. The variation law trend settlement, lateral resistance, compactness different excitation frequencies are analyzed comprehensivel...

Korea Train eXpress (KTX) is now being operated, which allows Korea being one of the countries that operates the high-speed rail system. The high-speed rail has its advantage of short time transportation of population and materials, which lead to many researches performed in this matter. In the case of high speed classical trackbed system, the maintenance and usability of gravel ballast system ...

Due to the influence of load, fatigue, corrosion, natural material aging and other long-term adverse factors, the state of the internal force of a cable-stayed bridge will be changed. These long-term effects can result in the bridge not meeting specified functional requirements, and potentially resulting in structural failure. This investigation focuses on the parameter identification of a gird...