• 대한토목학회논문집
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• 제33권1호
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• pp.219-227
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• 2013

본 연구에서는 연약점토지반에 근입된 송전철탑 기초를 대상으로, 기초부보강공법의 하나인 연결형 기초 형식의 거동과 연결보 특성에 따른 성능발휘 효과를 분석하였다. 이를 위해 유한요소 해석 모델을 구축하였으며, 송전철탑 기초에 연결보의 매트와 닿는 면적비율변화에 의한 거동 및 저항력 특성을 분석하였고, 송전철탑 연결형 기초 모형실험 결과를 이용하여 구축된 유한요소 해석 모델의 타당성의 검증을 실시하여 다양한 매개변수 해석을 통해 연결보의 강성 증가에 따른 효과를 분석하여 송전철탑 연결형 기초의 거동에 효과적인 연결보의 강성을 선정 하였다. 또한, 연결보 자체 휨 모멘트 분포를 확인하여 취약부 분석을 실시하였다.

• Geomechanics and Engineering
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• 제28권5호
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• pp.521-529
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• 2022

This research work deals with the development of air pluviation method for preparing uniform sand specimens for conducting large scale laboratory testing. Simulating real field conditions and to get reliable results, air pluviation method is highly desirable. This paper presents a special technique called air pluviation or sand raining technique for achieving uniform relative density. The apparatus is accompanied by a hopper, shutters with different orifice sizes and numbers and set of sieves. Before using this apparatus, calibration curves are drawn for relative density against different height of fall (H) and shutter sizes. From these calibration curves, corresponding to the desired relative density of 60%, the shutter size of 13mm and height of fall of 457.2 mm, are selected and maintained throughout the pluviation process. The density obtained from the mobile pluviator is then verified using the Dynamic Cone Penetrometer (DCP) test where the soil is poured in the box using defined shutter size and fall height. The results obtained from the DCP test are averaged as 60±0.5 which was desirable. The mobile pluviator used in this research is also capable of obtaining relative densities up to 90%. The instrument is validated using experimental and numerical approach. In numerical study, Plaxis 3D software is used in which the soil mass is defined by 10-Node tetrahedral elements and 6-Node plate is used to simulate plate behavior in the validation phase. The results obtained from numerical approach were compared with that of experimental one which showed very close correlation.