The verification of the casing scale model with using of ABAQUS system at tensile load test

2014 ◽  
pp. 294-308
Author(s):  
E.A. Funtusov
Keyword(s):  
2019 ◽  
Vol 18 (1) ◽  
Author(s):  
Andikanoza Pradiptiya ◽  
Yuwono Yuwono

ABSTRACTCertain buildings limit displacement of pile foundation with relatively small value so as not to cause damage to the structure. Loading test directly in the field requires a very high cost. To overcome this problem, it can be approached with a more economical cost, that is to move it into a certain scale models. The method used is to create a media model as a test box testing, by simulating the actual model in the form of a scale model. This method is fairly cheap and efficient as it can be used for various models and can be used repeatedly. The study was conducted using models of reduced scale single pile foundation made of concrete with a length of 0.2 m, 0.3 m, 0.4 m and each diameter of 0.02 m, 0.03 m, 0.04 m. Pile model is jacked in clay soil that has been compacted in a box and then given a tensile load test referring to ASTM D3689-07 procedure E (Constant Rate of Uplift Test). Mobilization of uplift resistance is determined from the pile frictional resistance force and displacement of the pile. The results showed that the frictional resistance value is reduced to the value at a particular displacement or at critical displacement pile.Key words : uplift resistance , sand, mini pile.ABSTRAKBeberapa konstruksi bangunan memberikan batasan kepada perpindahan tiang yang terjadi dengan nilai yang relatif kecil supaya tidak menyebabkan kerusakan struktur. Metode uji yang dipakai adalah membuat box uji model sebagai media pengujian, dengan mensimulasikan model yang sebenarnya ke dalam bentuk model skala. Penelitian dilakukan menggunakan model fondasi tiang tunggal skala tereduksi yang terbuat dari beton dengan panjang 0,2 m, 0,3 m, 0,4 m dan masing-masing diameter 0,02 m, 0,03 m, 0,04 m. Model tiang dipasang dengan cara ditekan pada tanah pasir yang sudah dipadatkan dalam box uji kemudian diberikan beban tarik yang mengacu pada ASTM D3689-07 prosedur E (Constant Rate of Uplift Test). Tahanan tarik tiang ditentukan tahanan gesek satuan dan perpindahan tiang berdasarkan variasi pengaruh diameter dan panjang tiang. Hasil penelitian menunjukkan bahwa nilai tahanan gesek satuan ultimit (fs) dan perpindahan kritis (δc) relatif menurun dengan bertambahnya ukuran diameter (d) tiang tetapi sebaliknya nilai fs tiang meningkat dengan dengan bertambahnya ukuran panjang (L) tiang. Semakin besar panjang tiang memperlihatkan kecenderungan bahwa pengaruh tekanan tanah lateral pasir terhadap selimut tiang meningkat sehingga memberikan kontribusi tahanan gesek yang lebih besar, sedangkan penambahan diameter tiang tidak meningkatkan tekanan tanah lateral pasir terhadap tiang.Katakunci : Tahanan tarik, pasir, Model Fondasi tiang.


2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Yiwei Lu ◽  
Hanlong Liu ◽  
Changjie Zheng ◽  
Xuanming Ding

X-section cast-in-place concrete pile is a new type of foundation reinforcement technique featured by the X-shaped cross-section. Compared with a traditional circular pile, an X-section pile with the same cross-sectional area has larger side resistance due to its larger cross-sectional perimeter. The behavior of static loaded X-section pile has been extensively reported, while little attention has been paid to the dynamic characteristics of X-section pile. This paper introduced a large-scale model test for an X-section pile and a circular pile with the same cross-sectional area subjected to cyclic axial load in sand. The experimental results demonstrated that cyclic axial load contributed to the degradation of shaft friction and pile head stiffness. The dynamic responses of X-section pile were determined by loading frequency and loading amplitude. Furthermore, comparative analysis between the X-section pile and the circular pile revealed that the X-section pile can improve the shaft friction and reduce the cumulative settlement under cyclic loading. Static load test was carried out prior to the vibration tests to investigate the ultimate bearing capacity of test piles. This study was expected to provide a reasonable reference for further studies on the dynamic responses of X-section piles in practical engineering.


2019 ◽  
Vol 1 (3) ◽  
pp. 219-224
Author(s):  
Andikanoza Pradiptiya ◽  
A’isyah Salimah

AbstractSome buildings impose limits on the foundation displacement that occur with relatively small values so as not to cause structural damage. The test method used was to make a model test box as a testing medium by simulating the actual model into the form of a scale model. The study was conducted using a single pile foundation with reduced scale, made of concrete with a diameter of 0.02 m, 0.03 m, 0.04 m and the length of each pile was 0.4 m. The pile model was mounted by pressing into the clay that had been compacted in the test box and then given a tensile load which refers to ASTM D3689-07 procedure E (Constant Rate of Uplift Test). Mobilization of pile friction resistance at critical displacement determined the frictional resistance of the ultimate pile units. The test results showed that the greater the diameter of the pile, the frictional resistance of the ultimate pile units would increase. The increase in frictional resistance of the ultimate pile units showed an average value of around 17.1%.Keywords : Pile foundation, Pile diameter, Friction resistance.AbstrakMeningkatnya pembangunan hunian mengakibatkan naiknya permintaan akan batako, hal ini tentunya Beberapa konstruksi bangunan memberikan batasan kepada perpindahan tiang yang terjadi dengan nilai yang relatif kecil supaya tidak menyebabkan kerusakan struktur. Metode uji yang dipakai adalah membuat box uji model sebagai media pengujian, dengan mensimulasikan model yang sebenarnya ke dalam bentuk model skala. Penelitian dilakukan menggunakan model pondasi tiang tunggal penampang lingkaran lingkaran skala tereduksi yang terbuat dari beton dengan diameter 0,02 m, 0,03 m, 0,04 m dan panjang  masing-masing tiang adalah 0,4 m. Model tiang dipasang dengan cara ditekan pada tanah lempung yang sudah dipadatkan dalam box uji kemudian diberikan beban tarik yang mengacu pada ASTM D3689-07 prosedur E (Constant Rate of Uplift Test). Mobilisasi tahanan gesek tiang pada perpindahan tiang kritis menetukan tahanan gesek satuan ultimit. Hasil uji memperlihatkan bahwa semakin besar diameter tiang, tahanan gesek satuan ultimit tiang akan bertambah. Peningkatan tahanan gesek satuan ultimit tiang menunjukkan rata-rata sekitar 17,1 %.Kata kunci : Pondasi Tiang, Diameter Tiang, Tahanan Gesek Tiang.


2018 ◽  
Vol 251 ◽  
pp. 04038 ◽  
Author(s):  
Michal Baca ◽  
Jaroslaw Rybak

Presented laboratory testing program of tubular steel piles is a part of a bigger research program which contained static load tests in full scale and numerical simulations of conducted research. The main goal of the research is to compare static load tests with different working conditions of a shaft. The presented small scale model tests are the last part of the research. The paper contains the testing methodology description and first results of model pile axial loading. The static load tests in a small laboratory scale were conducted in a container filled with uniformly compacted medium sand (MSa). The first results of the investigation are presented in this paper, with the comparison of two pile capacities obtained for different roughness of the pile shaft (skin friction). The results are presented as load-displacement curves obtained by means of the Brinch-Hansen 80% method.


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