TA638 : Laboratory evaluation of vibration isolation of dynamic loads caused by machine foundations by surface trenches
Thesis > Central Library of Shahrood University > Civil & Architectural Engineering > MSc > 2022
Authors:
[Author], Mohsen Keramati[Supervisor]
Abstarct: In recent years, with the spread of science and technology and the needs of human society, industrial and urban construction has increased significantly. Naturally, the increase of factories and industrial sheds, as well as the increase of urbanization, its development and the construction of sensitive structures have made the issue of vibration and seismics an important and main one of the concern of engineers. This is a major environmental problem, with some of the dry waste being worn tires that are very bulky. These vibrations propagate over a considerable distance, which disrupts the operation of vibration-sensitive devices, structures, and even their destruction. In order to prevent the propagation of these vibrations, the effect of these waves can be reduced by creating a barrier between the vibration source and the desired area. The best function as a barrier against waves is to create empty or open trenches. But due to limitations, it can not be considered as a suitable solution. Today we try to combine them, especially with Sandy soils reach a functional composition in industry and discuss environmental and structural geotechnics. In this research, on the soil of Firuzkuh sand bed in laboratory dimensions, using surface trenches, by combining Firuzkuh sand and crumb rubber in front of the industrial foundation on which the vibrating motor is installed, vibrations are reduced. First, the effect of trench dimensions is investigated, where length and depth have a great effect, but thickness does not have a great effect on the isolation of a trench. Also, by examining different trenches with combinations of 30, 20 and 10 percents by weight of crumb rubber and three different types of engine vibration on two types of heavy and light foundations, to the average insulation with values of 60.81%, 51%, 46.5% respectively, are reached for each combination and compared with each other. In the end, by comparing different vibrations, it results that when increasing the vibrations on the foundation, isolation and efficiency of the trench are increases.
Keywords:
#Soil vibrations #Surface trench #Sand and rubber mixture Keeping place: Central Library of Shahrood University
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