scholarly journals PENGARUH PERKUATAN TIANG TERHADAP STABILITAS TIMBUNAN DIATAS TANAH LUNAK MENGGUNAKAN METODE ELEMEN HINGGA

2020 ◽  
Vol 3 (2) ◽  
pp. 54
Author(s):  
Bambang Setiawan ◽  
Raden Harya Dananjaya H.I. ◽  
Muhammad Fathurrahman
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Safety Factor ◽  
Effective Stress ◽  
Soft Soil ◽  
Vertical Displacement ◽  
The Finite Element Method ◽  
The Road ◽  
Road Pavement

<p><em>Pile strength is widely used as a solution to the problem of road pavement on soft soil, because it can reduce vertical displacement due to the load on it and increase the safety factor value. This research analyses the vertical displacement, safety factor, effective stress and bearing capacity of the embankment on soft soil using the finite element method so the results can approach the original conditions in the field.</em> <em>The pile variations used are pile size variations 20x20 cm<sup>2</sup>; 25x25 cm<sup>2</sup>; and 30x30 cm<sup>2</sup> with a square shape, variations in the distance between the piles 1,60 m; 1,80 m; 2,00 m; and 2,20 m, the depth variations 15,00 m; and 20,00 m. Loading uses truck loads based on RSNI T-14-2004 and the road classification is artery IA. The results of the analysis show that pile strength with a size 20x20 cm<sup>2</sup>, the distance between pile is 1,60 m and the depth of the piles 20 m can reduce the vertical displacement by 71,31% and increase the safety factor by 123,25%.</em></p>

scholarly journals ANALISIS LENDUTAN MODEL SISTEM CAKAR AYAM MODIFIKASI DENGAN PEMBEBANAN TUNGGAL (BEBAN TITIK)

2019 ◽  
Vol 2 (2) ◽  
pp. 53
Author(s):  
Lutfi Ahmad Yudandi ◽  
Bambang Setiawan ◽  
Noegroho Djarwanti
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Soft Soil ◽  
The Road ◽  
Variation Distance ◽  
The Difference ◽  
Element Method

<em>Soft soil has low bearing capacity and high compressibility that can cause instability and long-term degradation that can make around some road settlement or wavy. A solution to prevent this soft soil problem was built Modified Chicken Foot, The function of Chicken Foot Foundation is to increase its bearing capacity. This research is using single load<strong> </strong>with variation distance of triangle foot foundation pattern whereas analysis of deflection using finite element method based. The research shows displacement result is depend on distance between load position and foot foundation, the closer distance between foot foundation the less it would result. The displacement result that happened at roadside is larger than at middle of the road, the difference between them is -6,8% up to 67% and The displacement result that happened in plate without pipe is larger than a plate with pipe, the difference between them is 12,31% up to 59,41%.  </em>

Analysis of the Contact Deformation of Tread Blocks

1992 ◽  
Vol 20 (4) ◽  
pp. 230-253 ◽  
Author(s):  
T. Akasaka ◽  
K. Kabe ◽  
M. Koishi ◽  
M. Kuwashima
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Deformation Behavior ◽  
Contact Deformation ◽  
The Finite Element Method ◽  
The Road ◽  
Loss Of Contact ◽  
Tread Rubber ◽  
Good Agreement ◽  
Rubber Block

Abstract The deformation behavior of a tire in contact with the roadway is complicated, in particular, under the traction and braking conditions. A tread rubber block in contact with the road undergoes compression and shearing forces. These forces may cause the loss of contact at the edges of the block. Theoretical analysis based on the energy method is presented on the contact deformation of a tread rubber block subjected to compressive and shearing forces. Experimental work and numerical calculation by means of the finite element method are conducted to verify the predicted results. Good agreement is obtained among these analytical, numerical, and experimental results.

Study on the Settlement of Soft Soil Subgrade with a Crust Layer

2014 ◽  
Vol 505-506 ◽  
pp. 82-88
Author(s):  
Da Zhi Wu ◽  
Zhen Ying Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soft Soil ◽  
The Finite Element Method ◽  
Crust Layer ◽  
Element Method

By using the finite element method, the settlement of soft soil subgrade with a crust layer has been investigated. To find the influence of thickness of the crust layer on the settlement, four different thicknesses, which are 0.0m, 1.5m, 3.5m and 5.5m, are selected. Besides, the settlement during the construction and post construction are also analyzed. It is found that the crust layer can reduce the settlement and uneven settlement of subgrade effectively. Besides, the settlement of the subgrade decreases with the increase of the thickness of crust layer. Moreover, with the increase of time, the uneven settlement of the pavement increases gradually. And when the time is up to a certain degree, the uneven settlement tends to be stable.

Behavior of Square Hollow Section Steel Tubes Filled with Concrete under Different Loading Conditions

2014 ◽  
Vol 577 ◽  
pp. 1097-1103
Author(s):  
Tian De Jin ◽  
Lan Hui Guo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Yield Strength ◽  
Bearing Capacity ◽  
Area Ratio ◽  
Loading Conditions ◽  
The Finite Element Method ◽  
Hollow Section ◽  
Core Concrete ◽  
Element Method

In this paper, the behavior of composite stub columns under different loading conditions is studied using the finite element method. The accuracy of the theoretical method is validated by comparing with the experimental results. The behavior of specimen under different loading conditions is analyzed. Then, based on the finite element method, the comparison of mechanical behavior under three typical loading conditions is studied. The results show that the difference on bearing capacity will become larger with the increase of steel area to concrete area ratio. For the core concrete loaded specimen with lower steel area-to-concrete area ratio, whose bearing capacity is the lowest, but its ductility is very good. With the increase of the steel yield strength, the bearing capacity will increase evidently for specimen loaded simultaneously. While for the specimen with only core concrete loaded, the steel yield strength has little influence except increase of ductility.

scholarly journals Method of Calculation Flexural Stiffness Over Natural Oscillations Frequencies

2018 ◽  
Vol 64 (4) ◽  
pp. 89-103
Author(s):  
A. Nesterenko ◽  
G. Stolpovskiy ◽  
M. Nesterenko
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Flexural Stiffness ◽  
The Finite Element Method ◽  
Load Bearing Capacity ◽  
Natural Oscillations ◽  
Load Bearing ◽  
Resonance Frequencies ◽  
Element Method

AbstractThe actual load-bearing capacity of elements of a building system can be calculated by dynamic parameters, in particular by resonant frequency and compliance. The prerequisites for solving such a problem by the finite element method (FEM) are presented in the article. First, modern vibration tests demonstrate high accuracy in determination of these parameters, which reflects reliability of the diagnosis. Secondly, most modern computational complexes do not include a functional for calculating the load-bearing capacity of an element according to the input values of resonance frequencies. Thirdly, FEM is the basis for development of software tools for automating the computation process. The article presents the method for calculating flexural stiffness and moment of inertia of a beam construction system by its own frequencies. The method includes calculation algorithm realizing the finite element method.

Evaluasi Stabilitas dan Penurunan antara Timbunan Ringan Mortar Busa Dibandingkan dengan Timbunan Pilihan pada Oprit Jembatan (Studi Kasus: Flyover Antapani, Kota Bandung) (Hal. 90-100)

2018 ◽  
Vol 4 (1) ◽  
pp. 90
Author(s):  
Hamdan Atamini ◽  
Benny Moestafa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Safety Factor ◽  
Soft Soil ◽  
Lateritic Soil ◽  
Research Use ◽  
West Java ◽  
Lightweight Material ◽  
Embankment Stability

ABSTRAKAda berbagai solusi yang dapat dilakukan agar suatu struktur dapat dibangun di atas tanah lunak. Salah satu solusi itu adalah pengurangan beban dengan menggunakan timbunan ringan. Analisis stabilitas dan penurunan dilakukan dengan membandingkan timbunan ringan (mortar busa) dan timbunan pilihan (tanah merah laterit) menggunakan perangkat lunak Plaxis Professional 8.6 berdasarkan metode elemen hingga. Penelitian ini menggunakan model Mohr-Coulomb untuk timbunan pilihan, sedangkan model Elastisitas Linier untuk timbunan ringan. Studi kasus ini dilakukan pada proyek Flyover Antapani (Kota Bandung, Jawa Barat). Penggunaan timbunan ringan menghasilkan nilai penurunan sebesar 3,53 cm dan faktor keamanan (FK) 2,74, sedangkan untuk timbunan pilihan nilai penurunannya sebesar 13,79 cm dengan faktor keamanan (FK) 1,36. Akhirnya dapat disimpulkan bahwa penggunaan timbunan ringan di atas tanah lunak akan menghasilkan penurunan lebih kecil (<74,40%) dengan faktor keamanan lebih besar (>50,36%) dibandingkan dengan timbunan pilihan.Kata kunci: tanah lunak, timbunan, penurunan, faktor keamanan. ABSTRACTThere are various solutions for a structure to be built on soft soil. One of these solutions is reduction of load using lightweight material embankment. Stability and settlement of the structure will be analyzed through comparison between lightweight embankment (foam mortar) with selected fill (lateritic soil) using Plaxis Professional 8.6 software based on Finite Element Method (FEM). This research use Mohr-Coulomb modeling for the selected fill, by using linier elasticity modelling for the lightweight embankment. A case study for this was conducted on Antapani Flyover project (Bandung, West Java). Resulting a settlement value of 3.53 cm with safety factor of 2.74 by using lightweight embankment, and a settlement value of 13.79 cm with safety factor of 1.36 by using the selected fill. Finally, the use of a lightweight material embankment on soft soil ground decrease settlement value (<74.40%) and increase safety factor (>50.36%).Keywords: soft soil, embankment, settlement, safety factor.

Renewed Inflation of Krafla Caldera, Iceland, since 2018: Sensitivity of Ground Deformation to lateral variation in Earth structure and architecture of the magmatic system explored with the Finite Element Method

2020 ◽  
Author(s):  
Chiara Lanzi ◽  
Vincent Drouin ◽  
Siqi Li ◽  
Freysteinn Sigmundsson ◽  
Halldor Geirsson ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Elastic Properties ◽  
Ground Deformation ◽  
Vertical Displacement ◽  
Magma Source ◽  
The Finite Element Method ◽  
Spherical Source ◽  
Horizontal Displacements ◽  
Element Method

&lt;p&gt;The Krafla volcanic area in Northern Volcanic Zone of Iceland was characterized by deflation starting in 1989, suggesting a general pressure decrease and/or volume contraction at depth, which then exponentially decayed until having no significant deformation since around 2000.&amp;#160; In summer 2018, the volcano behaviour changed to inflation as observed both by Global Navigation Satellite System (GNSS) geodesy &amp;#160;and Sentinel-1 satellite radar interferometry (InSAR). Inflation since 2018 occurs at a rate of 10-14 mm/yr, centered in the middle of the caldera. No significant change in seismicity has occurred in the area in 2018, but seismic moment release ocurrs at a higher rate since middle 2019. Gravity stations in the area were remeasured in November 2019 for allowing comparison with earlier observations, and for providing reference for later studies. Initial modelling of the geodetic data is carried out assuming that the deformation is caused by a spherical source of pressure in an uniform elastic half-space. The result suggests that the deformation can be broadly explained by a single source of magma inflow at depth around 3.9-7.5 km, with the best-fit value around 4-4.5 km. We also apply the Finite Element Method (FEM) to additionally consider modification of the deformation field caused by Earth&amp;#8217;s elastic heterogeneities and the uncertain geometry and&amp;#160; depth of the magma source. A set of FEM models are built with the COMSOL Multiphysics software in a 50x50 km domain where we test three different geometries of the source: a spherical source (radius 1000 km), a prolate ellipsoid,&amp;#160; and an oblate ellipsoid (sill-like) source, at 2.5, 4.0 and 5.5 km of depth. We also build a model to test how the vertical and horizontal displacements may be influenced by different elastic properties (e.g. Young&amp;#8217;s modulus; about an order of magnitude different within a caldera boundary) for these sources. The results show that lateral variations in material properites can have a significant influence on ground deformation. Low-value Young&amp;#8217;s inside caldera boundaries compared to higher values outside caldera boundaries will in particular influence the vertical displacement: the vertical displacement is about half of of what it is the original modelling. &amp;#160;The ratio of vertical to horizontal displacements will thus also be modified. This can in turn influence the inferred magma source geometry as it depends on the displacement ratios. The outcome of our study will provide better constrain for the elastic properties in Krafla area, and help understand the magma intrusion rate in the area.&lt;/p&gt;

Sign in / Sign up

Export Citation Format

Share Document