scholarly journals Load Transfer On Bored Pile Foundation Instrumented With Fiber Optic And Concrete Quality Analysis

UKaRsT ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 204
Author(s):  
Kevin Martandi Setianto ◽  
Cecilia Lauw Giok Swan ◽  
Paulus Pramono Rahardjo
Keyword(s):  
Pile Foundation ◽  
Load Transfer ◽  
Fiber Optic ◽  
Measurement Data ◽  
Quality Analysis ◽  
Loading Test ◽  
Bored Pile ◽  
Concrete Quality ◽  
Strain Data ◽  
Manual Calculation

The problem in the construction method of the bored pile is the contamination of mud or the other contaminant that can cause the modulus of elasticity of concrete to decrease. This research determines the modulus of concrete on a bored pile foundation instrumented with fiber-optic (FO) with a manual calculation based on strain data during loading test, validated with the results of research in the laboratory and numerical analysis. Fiber optic was used to measure the strain along with the pile during the loading test. The bored pile foundation is divided into 12 segments with the same strain characteristics, and then the modulus value is calculated. The result is the modulus value of each segment is different, and the value of the modulus changes along with the increase in strain; the modulus will decrease as the strain increases. This differs from the theory that the modulus has a fixed value approximated by empirical equations. Made a cylindrical concrete sample on both sides, which installed a FO to record the strain during the loading test. The result is true that the modulus is not constant but decreases as the strain increases. It is shown in the result of analysis to fiber-optic measurement data. Created a model in Plaxis2D for validation, and the results are not much different from the manual calculation.

scholarly journals Analysis of Carrying Capacity of the Bored Pile Foundation in Cibubur Transpark Project

2020 ◽  
Vol 2 (3) ◽  
pp. 63-68
Author(s):  
Arif Sanjaya ◽  
Resi Aseanto
Keyword(s):  
Bearing Capacity ◽  
Carrying Capacity ◽  
Pile Foundation ◽  
Tall Buildings ◽  
Test Method ◽  
Test Results ◽  
Loading Test ◽  
Bored Pile ◽  
Ultimate Carrying Capacity ◽  
Spt Data

The foundation is a construction that continues the burden of the upper structure and passes it on to the soil below it. A bored pile foundation is now an option in working on structures in densely populated areas and tall buildings. The purpose of this study is to calculate and compare the carrying capacity of the bored pile foundation based on N-SPT data with the O 'Neil & Reese, and Reese & Wright methods, while the Loading test data with the interpretation of the Davisson method and the Mazurkiewicz method. The results of calculations based on N-SPT data, the average ultimate carrying capacity of the foundation with the O’neil & Reese method of 1211.61 tons, Reese & Wright of 1235.02 tons. While the Interpretation of Loading test method for Marzukiewicz is 1267.00 tons, Davisson is 850.40 tons, and the carrying capacity of PDA test results is 121.72 tons. From the calculation of the bearing capacity of the consecutive foundation of the smallest is the Davisson method, the O'neil & Reese method, the PDA test method, the Reese & Wright method, and finally the Mazurkiewicz method.

scholarly journals ANALISIS MOMEN NOMINAL ULTIMIT TIANG BOR UNTUK DIGUNAKAN PADA PERHITUNGAN METODE BROMS

2020 ◽  
Vol 3 (2) ◽  
pp. 455
Author(s):  
Reynard Julio Widjaja ◽  
Gregorius Sandjaja Sentosa
Keyword(s):  
Cross Section ◽  
Pile Foundation ◽  
Reduction Factor ◽  
Bored Pile ◽  
Concrete Quality ◽  
Ultimate Moment ◽  
Section Analysis

Foundation is the lowest part of construction that is important to bear the burden of the building above it. In this analysis, used the calculation of circle cross section analysis to get the nominal moment that can be hold to bore piled that have a diameter 30 cm to 100 cm, other than that used the different of concrete quality, concrete quality that used in this analysis is 22.5 MPa, 25 MPa, and 30 MPa. The amount of reinforcement used is also different, such as 4 reinforcement, 6 reinforcement and 8 reinforcement. The reduction factor that used is the conservative number which is 0.65. After obtained the value of ultimate moment, used the Broms chart to get the value of Hu and H. From the calculation, the result between 50 kNm to 2244 kNm. Based on the comparison with Pile Foundation from brochure, ultimate moment of the Pile Foundation is stronger than the ultimate moment of the bored pile eith 340 kNm for pile foundation dan 206 kNm for bored pile.AbstrakFondasi merupakan bagian paling bawah dari suatu konstruksi yang penting untuk memikul beban bangunan di atasnya. Dalam analisis ini digunakan perhitungan analisis penampang lingkaran yang berguna untuk mencari momen nominal yang dapat ditahan oleh tiang bor yang memiliki diameter 30 cm sampai 100 cm, selain itu digunakan juga mutu beton yang berbeda, mutu beton yang dipakai dalam analisis ini adalah mutu beton fc’ 22.5 MPa, fc’ 25 MPa, dan fc’ 30 MPa. Jumlah tulangan yang dipakai pun juga berbeda yaitu 4 tulangan, 6 tulangan dan 8 tulangan. Untuk faktor reduksi kekuatan sendiri angka yang diambil adalah angka yang konservatif yaitu 0.65 agar lebih aman. Dari hasil perhitungan, momen ultimit diperoleh antara 50 kNm sampai 2244 kNm. Setelah didapat nilai momen ultimit, momen dimasukkan ke dalam grafik Broms agar mendapatkan nilai Hu dan Hijin. Berdasarkan hasil perbandingan dengan tiang pancang yang didapat dari brosur, momen ultimit tiang pancang lebih kuat daripada momen ultimit dari tiang bor dengan momen 340 kNm untuk tiang pancang dan 206 kNm untuk tiang bor.

STUDI ANALISIS PERILAKU DAYA DUKUNG PONDASI TIANG BOR DENGAN MENGGUNAKAN UJI BEBAN STATIK DAN MODEL TANAH MOHR COULOMB PADA PROYEK PARAGON SQUARE TANGERANG, BANTEN

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Nurmaidah Nurmaidah
Keyword(s):  
Finite Element ◽  
Numerical Method ◽  
Test Data ◽  
Carrying Capacity ◽  
Pile Foundation ◽  
Maximum Load ◽  
Empirical Method ◽  
Loading Test ◽  
Bored Pile ◽  
Data Loading

ABSTRAKDalam menganalisis dan membandingkan besarnya beban maksimum suatu pondasi tiang bor  melalui data Loading Test sudah banyak menggunakan berbagai macam cara, yaitu dengan menggunakan metode empirik maupun dengan menggunakan metode numerik. Metode - metode empirik untuk menganalisis daya dukung dan penurunan (settlement) pondasi tiang bor melalui data Loading test telah banyak dikembangkan, diantaranya adalah metode Davisson, Mazurkiewiecz dan metode Chin. Analisis yang dilakukan pada Proyek Paragon Square ini  yaitu untuk membandingkan besarnya daya dukung dan penurunan (settlement) yang terjadi pada pondasi tiang bor dengan menggunakan beberapa metode empirik dan juga dengan menggunakan metode elemen hingga.Kata Kunci : Bored Pile, Daya Dukung, Penurunan Tiang ABSTRACT In analyzing and camparing the amount of  the maximum load of a bored pile foundation with Loading Test data was using many various ways, by using empirical method and numerical method. Empirical method to analyze carrying capacity and settlement of a bored pile foundation from Loading Test data have been developed such as Davisson method, Mazurkiewiecz method and Chin method. In this paper, a analyze located Paragon Square Project is to campare carrying capacity and settlement in bored pile foundation by using some empirical method and finite element method.Keywords: Bored Pile, Carrying Capacity, Pile Reduction

Comparison of the Bidirectional Load Test with the Top-Down Load Test

2005 ◽  
Vol 1936 (1) ◽  
pp. 108-116 ◽  
Author(s):  
Oh Sung Kwon ◽  
Yongkyu Choi ◽  
Ohkyun Kwon ◽  
Myoung Mo Kim
Keyword(s):  
Load Transfer ◽  
Measurement Data ◽  
Load Test ◽  
Load Testing ◽  
Pile Head ◽  
Top Down ◽  
Simple Method ◽  
Testing Method ◽  
Settlement Behavior ◽  
Cell Test

For the past decade, the Osterberg testing method (O-cell test) has been proved advantageous over the conventional pile load testing method in many aspects. However, because the O-cell test uses a loading mechanism entirely different from that of the conventional pile loading testing method, many investigators and practicing engineers have been concerned that the O-cell test would give inaccurate results, especially about the pile head settlement behavior. Therefore, a bidirectional load test using the Osterberg method and the conventional top-down load test were executed on 1.5-m diameter cast-in-place concrete piles at the same time and site. Strain gauges were placed on the piles. The two tests gave similar load transfer curves at various depth of piles. However, the top-down equivalent curve constructed from the bidirectional load test results predicted the pile head settlement under the pile design load to be approximately one half of that predicted by the conventional top-down load test. To improve the prediction accuracy of the top-down equivalent curve, a simple method that accounts for the pile compression was proposed. It was also shown that the strain gauge measurement data from the bidirectional load test could reproduce almost the same top-down curve.

scholarly journals Load transfer on instrumented prestressed ground anchors in sandy soil

2021 ◽  
Vol 14 (6) ◽  
Author(s):  
Alex Micael Dantas de Sousa ◽  
Yuri Daniel Jatobá Costa ◽  
Luiz Augusto da Silva Florêncio ◽  
Carina Maria Lins Costa
Keyword(s):  
Skin Friction ◽  
Sandy Soil ◽  
Load Transfer ◽  
Retaining Wall ◽  
Load Variations ◽  
Bored Pile ◽  
Ground Anchors ◽  
Anchor Testing ◽  
Wall System ◽  
Unbonded Length

abstract: This study evaluates load variations in instrumented prestressed ground anchors installed in a bored pile retaining wall system in sandy soil. Data were collected from instrumentation assembled in the bonded length of three anchors, which were monitored during pullout tests and during different construction phases of the retaining wall system. Instrumentation consisted of electrical resistance strain gauges positioned in five different sections along the bonded length. Skin friction distributions were obtained from the field load measurements. Results showed that the skin friction followed a non-uniform distribution along the anchor bonded length. The mobilized skin friction concentrated more intensely on the bonded length half closest to the unbonded length, while the other half of the bonded length developed very small skin friction. The contribution of the unbonded length skin friction to the overall anchor capacity was significant and this should be accounted for in the interpretation of routine anchor testing results. Displacements applied to the anchor head were sufficient to mobilize the ultimate skin friction on the unbonded length, but not on the bonded length. Performance of loading-unloading stages on the ground anchor intensified the transfer of load from the unbonded length to the bonded length. Long-term monitoring of the anchor after lock-off revealed that the load at the anchor bonded length followed a tendency to reduce with time and was not significantly influenced by the retaining wall construction phases.

scholarly journals Determining the quantity of access tubes for quality control of bored pile concrete based on probability approach

2020 ◽  
Vol 14 (2) ◽  
pp. 76-86
Author(s):  
Bach Duong
Keyword(s):  
Quality Control ◽  
National Standard ◽  
Construction Process ◽  
Construction Stage ◽  
Probability Approach ◽  
Bored Pile ◽  
Defects Inspection ◽  
Concrete Quality ◽  
Bored Piles ◽  
Sonic Logging

Unexpected defects of concrete in a completed bored pile can arise during the construction stage. Therefore, post-construction testing of bored pile concrete is an important part of the design and construction process. The Cross-hole Sonic Logging (CSL) method has been the most widely used to examine the concrete quality. This method requires some access tubes pre-installed inside bored piles prior to concreting; the required quantity of access tubes has been pointed out in few literatures and also ruled in the national standard of Vietnam (TCVN 9395:2012). However, theoretical bases aiming to decide the required quantity of access tubes have not been given yet. A probability approach is proposed in this paper aiming to determine the essential quantity of access tubes, which depend not only on pile diameters, magnitude of defects, but also on the technical characteristics of CSL equipment. Keywords: access tubes; bored piles; CSL method; defects; inspection probability.

Expansive concrete drilled shafts

1985 ◽  
Vol 12 (2) ◽  
pp. 382-395 ◽  
Author(s):  
Shamim A. Sheikh ◽  
Michael W. O'Neill ◽  
M. A. Mehrazarin
Keyword(s):  
Load Transfer ◽  
Stress Path ◽  
Drilled Shafts ◽  
Drilled Shaft ◽  
Cement Concrete ◽  
Bored Pile ◽  
Expansive Concrete ◽  
Stiff Clay ◽  
Expansive Cement

A hypothesis is presented in this paper that states that expansive cement concrete produces a stronger bond between the concrete in a drilled shaft (bored pile) and the surrounding soil than does normal cement; this results in an increase in the frictional component of capacity and a reduction in the settlement of the shaft at working load levels.Four types of expansive cement, type "K" cement (the expansive cement available commercially) and three made from commercially available materials, were tested for their expansion characteristics; two of them were selected to be used in two instrumented drilled shafts in stiff clay. Normal (type 1) cement was used in a third shaft to serve as a reference. The three shafts were tested to failure after essentially all the expansion was deemed to have taken place in the two expansive concrete shafts. Lateral and longitudinal expansion of the shafts were monitored during the curing period. Load–settlement behaviour and load transfer between shafts and soil during the tests were studied.The test results permitted the preliminary conclusion that expansive cement concrete can increase the frictional capacity of drilled shafts in stiff clay by as much as 50% and reduce the settlement by about 50%. The results are valid for short-term behaviour of drilled shafts made of expansive cement. The long-term behaviour of such shafts remains to be studied. Key words: base bearing capacity, bored pile, cement (expansive), concrete (structural), drilled shaft, ettringite, expansion, frictional capacity, settlement, stress path.

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