Out-of-Plane Stability Analysis of Combined Boom System with Main Jib and Fly Jib

2014 ◽  
Vol 685 ◽  
pp. 217-223
Author(s):  
Peng Lan ◽  
Teng Fei Wang ◽  
Nian Li Lu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Bearing Capacity ◽  
The Finite Element Method ◽  
Torsional Deformation ◽  
Out Of Plane ◽  
Dip Angle ◽  
The Stability ◽  
Deformation Compatibility

The objective of this study is to develop an analytical method for the out-of-plane stability of combined boom system with main jib and fly jib. Boundary conditions and deformation compatibility equations are introduced to get the analytical expression of out-of-plane buckling characteristic equation by establishing the bending and torsional deformation differential equations of jibs and the strut under the instability critical state. The analytical results obtained agree well with the finite element method (FEM) results. The influence of the dip angle between the main jib and the fly jib on the stability of the boom system is discussed. And the comparison between the combined boom system and the bending beam-column in the stable bearing capacity is made. It is shown that the upwards-bend boom system is much stronger than the downwards-bend boom system. There exists a certain dip angel between the main jib and the fly jib that makes the stable bearing capacity biggest. By comparing the stable bearing capacity of boom system with that of the bending beam-column, it is obtained that the flexible tension system will significantly improve the stable bearing capacity of the bending beam-column.

Out-of-Plane Stability Analysis of Crane Jib with Auxiliary Bracing

2014 ◽  
Vol 1078 ◽  
pp. 201-205
Author(s):  
Teng Fei Wang ◽  
Peng Lan ◽  
Nian Li Lu
Keyword(s):  
Differential Equation ◽  
Finite Element Method ◽  
Finite Element ◽  
Characteristic Equation ◽  
Order Effect ◽  
The Finite Element Method ◽  
Analysis Model ◽  
Lateral Direction ◽  
Out Of Plane ◽  
Deformation Compatibility

The analysis model is built to investigate the out-of-plane stability of crane jib with auxiliary bracing. Considering the second-order effect, the analytical expression of the out-of-plane buckling characteristic equation for the crane jib with auxiliary bracing is obtained by establishing the bending deflection differential equation of jib under the instability critical state with the method of differential equation. The equilibrium equation of the cable converging point in the lateral direction is introduced to solve the differential equation besides the boundary conditions and deformation compatibility equations. With the characteristic equation, the critical compression or the critical lifting load can be easily obtained. The characteristic equation is analytically expressed and the analytical results obtained agree very well with the finite element method (FEM) results. The validity of the characteristic equation is verified.

scholarly journals Determining the Critical Slip Surface of Three-Dimensional Soil Slopes from the Stress Fields Solved Using the Finite Element Method

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Yu-chuan Yang ◽  
Hui-ge Xing ◽  
Xing-guo Yang ◽  
Jia-wen Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Safety Factor ◽  
Slip Surface ◽  
Three Dimensional ◽  
Soil Slope ◽  
Critical Slip Surface ◽  
The Finite Element Method ◽  
The Stability

The slope stability problem is an important issue for the safety of human beings and structures. The stability analysis of the three-dimensional (3D) slope is essential to prevent landslides, but the most important and difficult problem is how to determine the 3D critical slip surface with the minimum factor of safety in earth slopes. Basing on the slope stress field with the finite element method, a stability analysis method is proposed to determine the critical slip surface and the corresponding safety factor of 3D soil slopes. Spherical and ellipsoidal slip surfaces are considered through the analysis. The moment equilibrium is used to compute the safety factor combined with the Mohr-Coulomb criteria and the limit equilibrium principle. Some assumptions are introduced to reduce the search range of center points and the radius of spheres or ellipsoids. The proposed method is validated by a classical 3D benchmark soil slope. Simulated results indicate that the safety factor of the benchmark slope is 2.14 using the spherical slip surface and 2.19 using the ellipsoidal slip surface, which is close to the results of previous methods. The simulated results indicate that the proposed method can be used for the stability analysis of a 3D soil slope.

scholarly journals ANALISIS STABILITAS TEROWONGAN DANGKAL PADA TANAH LUNAK

2020 ◽  
Vol 1 (1) ◽  
pp. 573-584
Author(s):  
Putri Nova Haryu Dhanti ◽  
Singgih Saptono
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Soft Soil ◽  
Infrastructure Development ◽  
The Finite Element Method ◽  
Swelling Properties ◽  
Road Tunnels ◽  
The Stability ◽  
Element Method

ABSTRAK Pada lima tahun terakhir ini banyak pembangunan yang dilakukan di Indonesia khususnya pembangunan infrastruktur, seperti pembangunan sarana Mass Rapid Transportation (MRT) berupa terowongan di Jakarta, dan berapa terowongan jalan raya dan terowongan jalur kereta api. Hal ini menjadi tantangan bagi para pembuatan terowongan di Indonesia. Tantangan tesebut adalah membuat terowongan jalan raya dan kereta api pada tanah lunak khususnya lempung dan pada kedalaman yang dangkal. Hal ini perlu perhatian khusus, disebabkan oleh sifat lempung yang memiliki sifat swelling dan serta penggalian terowongan tersebut pada kedalamanan kurang dari 100 m. Pendekatan kekuatan batuan sudah tidak dapat digolongan sebagai batuan karena pada umumnya menurut meterial lempung digolongkan sebagai tanah, sehingga teori elastistas sudah tidak berlaku lagi. Pendekatan yang diusulkan untuk analisis stabilitas  pada terowongan di batuan lempung  adalah berperilaku swelling sesuai dengan kandungan mineral penyusunnya yaitu montmorilonit. Untuk itu analisis stabiltas diperlukan parameter swelling. Pada Analisis dengan perilaku sewlling ini menggunakan metode elemen hingga (Phase2, Rocscience). Dengan pendekatan perilaku Swelling dalam  analisis stabilitas terwongan akan lebih mendekati dengan sifat material yang ada di terowongan. Kata kunci: swelling, metode elemen hingga, stabilitas, terowongan  ABSTRACT In the last five years a lot of development has been carried out in Indonesia, especially infrastructure development, such as the construction of Mass Rapid Transportation (MRT) facilities in the form of tunnels in Jakarta, and how many road tunnels and railroad tunnels. This is a challenge for tunnels in Indonesia. The challenge is to build road and rail tunnels on soft soil, especially clays and at shallow depths. This needs special attention, due to the nature of the clay which has swelling properties and the excavation of the tunnel in the depth of less than 100 m. Rock strength approach can no longer be classified as rock because in general according to clay meterial classified as soil, so the theory of electricity is no longer valid. The proposed approach for the stability analysis of tunnels in clay rock is to behave swelling according to its constituent mineral content, montmorillonite. For this reason, stability analysis requires swelling parameters. In this analysis with sewlling behavior using the finite element method (Phase2, Rocscience). With the Swelling behavior approach in the tunnel stability analysis it will be closer to the material properties in the tunnel. Key words : Swelling, Finite Element Method, Stability, Tunnel 

scholarly journals Research on the stability of the 3D frame on coral foundation subjected to impact load

2020 ◽  
Vol 20 (2) ◽  
pp. 231-243
Author(s):  
Nguyen Thanh Hung ◽  
Nguyen Thai Chung ◽  
Hoang Xuan Luong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Numerical Analysis ◽  
Impact Load ◽  
Contact Element ◽  
The Finite Element Method ◽  
Wave Load ◽  
The Stability ◽  
Sea Wave

This article presents an application of the finite element method (FEM) for the stability analysis of 3D frame (space bar system) on the coral foundation impacted by collision impulse. One-way joints between the rod and the coral foundation are described by the contact element. Numerical analysis shows the effect of some factors on the stability of the bar system on coral foundation. The results of this study can be used for stability analysis of the bar system on coral foundation subjected to sea wave load.

Stability Analysis of Composite Perforated Annular Sector Plates Under Thermomechanical Loading by Finite Element Method

2018 ◽  
Vol 18 (07) ◽  
pp. 1850100 ◽  
Author(s):  
Alireza Shaterzadeh ◽  
Hamed Behzad ◽  
Mohammad Shariyat
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Mechanical Load ◽  
Perforated Plate ◽  
Curvilinear Coordinates ◽  
Element Formulation ◽  
The Finite Element Method ◽  
The Stability ◽  
Element Method

This paper presents the stability analysis of a perforated plate with sector geometry made of composite materials. The sector of concern is a compound of graphite-epoxy and glass-epoxy with identical ply thickness but different fiber angles for each layer. The mechanical load conditions considered include uniform axial, circumferential, and biaxial pressure, while the thermal loading is specified to be uniform temperature increase over the whole sector. The existence of one or two circular holes has increased the complexity of analysis. To obtain solutions of high accuracy, the three-dimensional elasticity theory relations have been employed. Using the finite element method along with the stability condition of Trefftz, the buckling equation of the structure is derived. Green nonlinear strain-displacement relations are used to form the geometrical stiffness matrix. Unlike the finite element method used by other researches, a novel curved 3D B-Splined element is used to more accurately trace the displacement and stress variations of the structure. This element can be used in solution domains with geometric discontinuities, such as perforated plates and also meshed in the thickness direction. Moreover, instead of using the common von Karman assumptions, the most general form of the strain tensors in the curvilinear coordinates is adopted. The buckling load is obtained by extremizing the second variations of the total potential energy. The finite element formulation is coded in the MATLAB software. The effects of various parameters such as sector dimensions, dimensions of the hole, mechanical load directions, and fiber angles of each layer on the thermomechanical buckling is investigated.

scholarly journals Design of Foundations for Wind Turbine with Analysis by Finite Element Method

2016 ◽  
Author(s):  
Askar Zhussupbekov ◽  
Rauan Lukpanov ◽  
Dinara Orazova ◽  
Zhanbota Sapenova
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Wind Energy ◽  
Bearing Capacity ◽  
Wind Turbine ◽  
The Finite Element Method ◽  
Program Complex ◽  
Engineering Solution ◽  
Element Method

Presents engineering solution of wind energy tower (WET) foundation and basement designing in hydrogeological conditions of the Ereymentau area. Calculations of forces perceived by the WET, and following bearing capacity, settlement and stability analysis are made by the Finite Element Method in the program complex SCAD and Plaxis 2D. The calculated results in paper had been presented in graphics and tabulars.

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