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RISS 인기검색어
- 검색키워드
- 저자 : Kulhawy, Fred H. (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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조남준,Kulhawy, Fred H. 한국지반공학회 1995 지반 : 한국지반공학회지 Vol.11 No.3
현장타설말뚝기초가 보다 빈번하게 여러가지 구조물의 기초로 쓰이고 있다. 그러나, 경사하중하의 현장타설말뚝의 거동에 대하여는 알려진 사실이 거의 없다. 본 연구에서는, 경사하중을 받는 현장타설말뚝의 비배수거동에 대하여 연구하고자 체계적인 실험을 행하였다. 기초의 직경에 대한 깊이의 비와 하중의 경사도가 같은 변수들을 변화시키면서 행한 연구를 통하여 경사하중에 대한 지지력을 예측하는 반이론적 방법을 개발하였다. 시험변수들은 실제 송전탑건설시 가장 빈번하게 사용되는 대표적인 값들과 같도록 선택되었다. 직경에 대한 말뚝의 깊이비(D/B)가 서로 다른 짧은 강체말뚝에 대하여 논하였으며, 축방향 인발, 경사 인발, 그리고 경사 압축등과 같은 하중상태에 대하여 연구하였다. 경사지지력을 구조상호작용 방정식과 본 실험연구에서 개발한 공식을 사용하여 평가하여 보았다. 본 연구에서 개발한 새로운 공식은 실험실 시험치와, 제한적이나마, 현장의 실제시험치에 적용될 수 있음을 알 수 있었다. Drilled shafts are used increasingly as the foundations for many types of structures. However, very little knowledge of drilled shaft behavior under inclined load is available. In this study, a systematic experimental testing program was conducted to understand the undrained behavior of drilled shaft foundations under inclined loads. A semi-theoretical method of predicting the inclined capacity was developed through a parametric study of the variables such as shaft geometry and load inclination. Test parameters were chosen to be representative of those most frequently used in the electric utility industry. Short, rigid shafts with varying depth/diameter(D/B) ratios were addressed, and loading modes were investigated that includes exial uplift, inclined uplift, and inclined compression loads. Capacities were evaluated using the structural interaction formula and an equation developed from this experimental study. This new equation models the laboratory data well and is applicable for the limites field data.
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Reduction of Pile Head Displacement for Restrained-Head Single Pile
원진오,Fred H. Kulhawy 대한토목학회 2009 KSCE JOURNAL OF CIVIL ENGINEERING Vol.13 No.3
The effect of pile head fixity on the displacement of laterally loaded pile groups was investigated using analytical methods. The reduction of lateral displacement by a pile cap is generalized using a reduction factor, and the effect of soil and pile properties was investigated through a parametric study using the Davies and Budhu method. It was found that the soil properties have a major influence on the reduction factor, while the pile property influence is relatively minor. These results are presented graphically and show further the decrease in the reduction factor with increasing load level. Based on these results, a design chart for the reduction factor is suggested. The effect of pile head fixity on the displacement of laterally loaded pile groups was investigated using analytical methods. The reduction of lateral displacement by a pile cap is generalized using a reduction factor, and the effect of soil and pile properties was investigated through a parametric study using the Davies and Budhu method. It was found that the soil properties have a major influence on the reduction factor, while the pile property influence is relatively minor. These results are presented graphically and show further the decrease in the reduction factor with increasing load level. Based on these results, a design chart for the reduction factor is suggested.
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Maria Cecilia M. Marcos,Yit-Jin Chen,Fred H. Kulhawy 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.5
An extensive evaluation of capacity interpretation criteria is presented for driven Precast Concrete (PC) piles under axial compression loading. A database of static load tests for round and square cross-section piles under both drained and undrained loading was developed and utilized in the analysis. The compiled data are generalized into four groups (round - drained, square -drained, round - undrained, and square - undrained) to examine the differences in their behavior. Generally, similar trends for each criterion are noted for the four groups. Statistical analyses show a decreasing COV with increasing pile displacement, and the drained load tests show less variability than the undrained load tests. For drained loading, somewhat higher interpreted capacities are exhibited by round piles than by square piles. In addition, a slightly stiffer normalized load-displacement curve is shown for the drained loading compared to the undrained loading. The drained and undrained databases are further sub-divided by hammer type (drop, air/steam, diesel, and hydraulic) to explore the effects of driving energy and driving resistances on pile capacity. Based on these analyses, the relative merits and interrelationships of these criteria are established, and design recommendations for the use of these methods are suggested in terms of normalized capacity and displacement.
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