Experiences from past earthquake disasters clearly shows that the ground motion was highly responsible for majority of property and life loss. Excessive damage was occurred to pile supported bridges, towers, chimneys, high rise structures, etc among the collapsed structures. A numerical study is carried out to understand the dynamic soil structure interaction of a high rise structure in a visco elastic half space in the presence of nearby pile supported structures. For understanding the seismic response of group of high rise structures supported on pile foundations a two dimensional study is carried. Framed structures which are assumed from the linear structures of different dynamic characteristics are supported on group of piles. Some studies related to group effect of structures supported on piles are considered like group of two identical structures, group of three identical structures and group of three different structures, secondly the effect of variability in structure height is considered like 5 storey structure, 10 storey structure and 15 storey structure and the third one in which the effect of variability in structure shape is considered. Above all case the effect of structure soil structure interaction on seismic response is compared with fixed base response.
Most of the machine foundations are located in the regions with poorly graded soil including loose sand. Hence, the experimental studies are undertaken to evaluate the dynamic parameters of geosynthetics using cyclic PLT. This paper presents the results of the 10 m2 area of the model cyclic plate load test conducted on geosynthetics reinforced soil beds with similar density, supporting square footing, the results of cyclic PLT from the laboratory-model tests on square footings resting on a sand bed. The various intensity of cyclic load (loading-unloading) applying on the footing and then the elastic recovery of the footing alike to each intensity of loading obtains during the tests to determine the coefficient of elastic uniform compression (Cu) of sand. Results showes that the provision of geosynthetics like geogrid and jute the value of Cu decreases due to elastic recovery increases as compared to unreinforced soil bed, by 06% to 94% and natural frequency 03% to 76% . Introduction of planer geogrid at the base of the geosynthetic matress not only enhance the load carrying capacity but also increasing the elastic recovery to making them more elastic and prevents footing to failure due to vibration. In addition to the experiments also analyses various dynamic parameters of the machine foundation using cyclic PLT on the geosynthetics
A soil plug is usually developed when an open-ended steel pipe pile is inserted in the ground either by driving or pressing techniques. Plug plays a vital role in calculating the load-carrying capacity of pipe piles. This paper presents an experimental study that was conducted with an aim to correlate the ultimate capacity of partially plugged pipe piles in sand with plug length ratio. The effect of pipe pile thickness in terms of outer and inner diameter ratio was also studied. Based on the experimental study, empirical relationships were developed. Experimental results were also validated with a theoretical solution of Jeong and Ko (in: 15th Asian regional conference on soil mechanics and geotechnical engineering, Fukuoka, Japan pp [1327][1328][1329][1330][1331][1332] 2015).
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