Optimized Design of Larsen Steel Sheet Pile Supporting Structure Based on Parameter Sensitivity

2014 ◽  
Vol 501-504 ◽  
pp. 770-776 ◽  
Author(s):  
Jin Rong Xie ◽  
Ba Tong Li ◽  
Pi Hui Chen ◽  
Yu Qiong Zhuang
Keyword(s):  
Steel Sheet ◽  
Three Dimensional ◽  
Horizontal Displacement ◽  
Optimized Design ◽  
Sheet Pile ◽  
Supporting Structure ◽  
Geological Conditions ◽  
Key Factor ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Based on the transformation project of rain and sewage diversion in a city, the optimized design of Larsen steel sheet pile supporting structure in pipe-pit excavation was made. Using three-dimensional finite element method to analyze the retaining characteristics of Larsen steel sheet pile, soil deformation of adjacent transverse brace in the middle position and surface subsidence were regarded as design control indicators; through numerical analysis of the geological conditions, load, pile length, horizontal interval of transverse brace and other factors on the sensitivity of the design control indicators, horizontal displacement of brace was regarded as a key factor in the optimal design, and accordingly, related optimized program was proposed. The implementation results show that the optimized scheme can improve the efficiency of construction, protect the safety of construction, and provide a reference for the design and construction of similar projects.

Inside and Outside Earth Pressure Research of Steel Sheet Pile Cofferdam

2012 ◽  
Vol 446-449 ◽  
pp. 1822-1826
Author(s):  
Bao Lin Xiong ◽  
Jin Song Tang ◽  
Wei Chen
Keyword(s):  
Steel Sheet ◽  
Three Dimensional ◽  
Earth Pressure ◽  
Element Model ◽  
Sheet Pile ◽  
Soil Pressure ◽  
River Bed ◽  
Internal Support ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

As the cofferdam makes the water flow change, the river bed near the cofferdam has been washed; soil pressure on the cofferdam will be changed. In order to better grasp the force of the cofferdam, the earth pressure on the cofferdam need to be monitored. As it is difficult to monitor occasion, the computing earth pressure is necessary. In this paper, three-dimensional finite element model on the steel sheet pile, purlin, internal support and soil can be established. Through compassion computing value of model and monitoring value, conclusions are drawn.

Study on Stability of High Embankments on Rock Slope under Complicated Stress Conditions

2011 ◽  
Vol 368-373 ◽  
pp. 1642-1648
Author(s):  
Gui Ling Ding
Keyword(s):  
Finite Element ◽  
Slip Surface ◽  
Three Dimensional ◽  
Slope Instability ◽  
Instability Criterion ◽  
Two Dimensional ◽  
Study Results ◽  
Geological Conditions ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Three-dimensional finite element analysis should be used in stability analysis of slope because it can overcome the short advantages of two-dimensional finite element and can simulate the complex topographic and geological conditions. Based on the large-scale triaxial shear test, the modified Duncan-Chang model is established. Based on strength reduction elasto-plastic finite element, stability of high fill embankment was studied with three-dimensional finite element method considering the complex terrain conditions. Study results suggest that plastic strain and displacement mutant of slip surface node can be a sign of slope instability as a whole. At the same time calculation of three-dimensional finite element also does not converge. Therefore, it can be slope instability criterion calculate whether the finite element static analysis converges or not. On the other hand, stability safety factor of high fill embankment under three-dimensional conditions is larger than that of two-dimensional conditions, which shows that boundary conditions of high fill embankment enhance its stability.

Different Geological Conditions Affect the Results of Low Strain Integrity Testing of Piles

2011 ◽  
Vol 94-96 ◽  
pp. 692-696
Author(s):  
Zhi Qiang Zhang ◽  
Nan Gai Yi
Keyword(s):  
Boundary Conditions ◽  
Three Dimensional ◽  
Element Model ◽  
Time Curve ◽  
3 Dimensional ◽  
Geological Conditions ◽  
Dimensional Finite Element ◽  
The One ◽  
Three Dimensional Finite Element ◽  
Dimensional Wave

Low strain ingtegrity testing of pile is based on the one-dimensional wave theory.However, the pulse wave produced by hammer is actually 3-dimensional wave , whose propogation could be affected by the pile sides with different geological conditions. The effect is more obvious when the geological conditions of the pile sides become more complex. This test established three-dimensional finite element model which has fixed pile bottom and different geological conditions by applying ANSYS/LS-DYNA dynamic analysis method. The test simulated nine different boundary conditions of the pile sides. The results were divided into four groups to compare. And the velocity-time curve of the particle in different conditions was obtained. Through analyzing the simulation data, the conclusion that the stress wave is affected by the boundary conditions of the pile sides could be made.

The Stress and Displacement Analysis of the Cut-Off Wall for the Deep Overburden Dam

2011 ◽  
Vol 393-395 ◽  
pp. 463-466
Author(s):  
Bo Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Horizontal Displacement ◽  
Element Analysis ◽  
Nonlinear Constitutive Model ◽  
Dimensional Finite Element ◽  
Clay Core ◽  
Dam Stability ◽  
Three Dimensional Finite Element

The Duncan-Chang nonlinear constitutive model is used to carry out a three-dimensional finite element analysis of Xia Ban Di deep overburden dam with clay core. The regularities of the horizontal displacement, vertical stress and stress level for the cut-off wall are studied in this paper, and the paper provided reference for the dam stability and anti-seepage treatment of the cut-off wall with deep overburden.

Study on Stability of High Embankments under Complicated Stress Conditions

2011 ◽  
Vol 117-119 ◽  
pp. 150-157
Author(s):  
Sheng Chuan Liu
Keyword(s):  
Finite Element ◽  
Slip Surface ◽  
Three Dimensional ◽  
Slope Instability ◽  
Instability Criterion ◽  
Two Dimensional ◽  
Study Results ◽  
Geological Conditions ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Three-dimensional finite element analysis should be used in stability analysis of slope because it can overcome the short advantages of two-dimensional finite element and can simulate the complex topographic and geological conditions. Based on the large-scale triaxial shear test, the modified Duncan-Chang model is established. Based on strength reduction elasto-plastic finite element, stability of high fill embankment was studied with three-dimensional finite element method considering the complex terrain conditions. Study results suggest that plastic strain and displacement mutant of slip surface node can be a sign of slope instability as a whole. At the same time calculation of three-dimensional finite element also does not converge. Therefore, it can be slope instability criterion calculate whether the finite element static analysis converges or not. On the other hand, stability safety factor of high fill embankment under three-dimensional conditions is larger than that of two-dimensional conditions, which shows that boundary conditions of high fill embankment enhance its stability.

scholarly journals Stability Analysis of High-Pile and high-pier Considering Initial Pier Deviation

2021 ◽  
Vol 261 ◽  
pp. 02050
Author(s):  
Mei-Liang Zhu ◽  
Li-Qing Zhang ◽  
Ye Ma ◽  
Shun-Kun Jiang
Keyword(s):  
Three Dimensional ◽  
Horizontal Displacement ◽  
Nonlinear Buckling ◽  
Buckling Loads ◽  
Dimensional Finite Element ◽  
Calculation Results ◽  
High Pier ◽  
The Stability ◽  
Three Dimensional Finite Element ◽  
Better Than

Based on the high-pile and high-pier bridge of Qianhuang Expressway, eigenvalue buckling analysis is carried out by establishing three-dimensional finite element models of three different bridge types and high-pier types, and the corresponding structural nonlinear buckling loads under different initial pier deviations are calculated. The calculation results show that the nonlinear buckling loads of three high-pier types are less than elastic buckling loads. The stability of column high-pile and high-pier of continuous bridge is better than that of simple supported bridge, and the stability of plate high-pier is better than that of other two high-piers. In addition, the corresponding buckling load decreases with the increase of the initial horizontal displacement, indicating that the pier top offset of the high-pile and high-pier bridge is not conducive to the stability of the structure.

On Dredging Renovation of High-Piled Wharf by FEA

2014 ◽  
Vol 1065-1069 ◽  
pp. 613-618
Author(s):  
Zhi Hui Liu ◽  
Liang De He ◽  
Ying Fa He ◽  
Yuan Yuan Lu
Keyword(s):  
Three Dimensional ◽  
Bending Moment ◽  
Finite Element Models ◽  
Sheet Pile ◽  
Bank Slope ◽  
Before And After ◽  
Dimensional Finite Element ◽  
Pile Caps ◽  
Three Dimensional Finite Element ◽  
Sheet Pile Wall

In this paper, high-piled wharf is reinforced with a view to studying how the wharf dredging renovation affects its structure. As regarding the problem that the original balance of the bank slope is destroyed after upgrading, two retrofit schemes that set sheet pile wall at anterior wharf and low-piled caps at surcharge area are conducted to analyze the bank slope deformation and the inter force before and after wharf retrofit by means of three-dimensional finite element models. The analysis shows that for the scheme of setting sheet pile wall at front wharf, the inter force of the anterior pile station reduced while that of the post pile station near the stack area remains large. For the other scheme, the bending moment of the pile that closes to stack area significantly decreases after setting low pile caps. If both schemes are adopted coherently, the reinforcement effects to the anterior and post pile stations would be improved greatly.

Axial Load Behavior of Acomposite Wall Strengthened with an Embedded Octagon Cold-Formed Steel

2015 ◽  
Vol 754-755 ◽  
pp. 437-441 ◽  
Author(s):  
Salam Jasim Hilo ◽  
Wan Hamidon Wan Badaruzzaman ◽  
Siti Aminah Osman ◽  
Ahmed W. Al Zand
Keyword(s):  
Axial Load ◽  
Steel Sheet ◽  
Three Dimensional ◽  
Dimensional Finite Element ◽  
Cold Formed Steel ◽  
Composite Wall ◽  
Different Shapes ◽  
Three Dimensional Finite Element ◽  
Composite Walls ◽  
Load Behavior

This study investigates the axial load behavior of an existing composite wall consists of a double-skinned profiled steel sheet in-filled with normal concrete. Three different composite walls in three-dimensional finite element models were developed, i.e. profiled steel sheet (PSS), core concrete, and the full composite wall system. The models were simulated and compared with the experimental results published by other researchers. Studies are then carried out on different effect of varying the PSS thicknesses, an embedded octagon cold-formed steel (CFS) thickness, and an embedded octagon CFS supported by two stiffeners with different shapes. As a result, the ultimate axial load of the composite wall was increased by approximately 3.3% when PSS thickness changed from 0.8 mm to 1.0mm. Meanwhile, the ultimate axial load was also increased by 17% and 55% when an embedded octagon CFS with thicknesses of 0.8 mm and 1.0 mm were used. Lastly, the ultimate axial load was raised by 54% and 78% when an L-shaped and a T-shaped stiffener were added.

scholarly journals Experimental and numerical analysis on fire behaviour of loaded cross-laminated timber panels

2019 ◽  
Vol 23 (1) ◽  
pp. 22-36
Author(s):  
Yuexiang Wang ◽  
Jin Zhang ◽  
Fang Mei ◽  
Jianan Liao ◽  
Weibin Li
Keyword(s):  
Three Dimensional ◽  
Experimental Tests ◽  
Element Model ◽  
Fire Behaviour ◽  
Cohesive Elements ◽  
Cross Laminated Timber ◽  
Standard Fire ◽  
Key Factor ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Cross-laminated timber is a relatively new engineered timber material that can be used in the design and construction of modern timber buildings. A key factor that raises concerns in the wide application of cross-laminated timber is the uncertainty of its fire performance. This article describes experimental and numerical investigations on the fire behaviour of loaded cross-laminated timber panels manufactured with Canadian hemlock. A total of 10 cross-laminated timber panels with different number and thickness of layers were tested under ambient and standard fire conditions to investigate the flexural capacity at ambient temperature, and temperature distribution, charring rate, fire resistance, mid-span deflection under fire exposure. Three-dimensional finite element model was developed using the Hashin criterion and cohesive elements to predict the failure of wood and adhesive, respectively. The thermal model implicitly considers the rapidly increased temperature of inner fresh timber after the protective charred layers have fallen off. The numerical model was validated with the results obtained from experimental tests and was found to have the ability to simulate the fire behaviour of loaded cross-laminated timber panels in reasonable accuracy.

Numerical Investigation of Shield Cross Tunnel Minimum Cover Depth

2012 ◽  
Vol 256-259 ◽  
pp. 1270-1275
Author(s):  
Guang Ming Li ◽  
Jin Li Qiao ◽  
Pei Chen
Keyword(s):  
Surface Deformation ◽  
Three Dimensional ◽  
Ground Surface ◽  
Subway Tunnel ◽  
Cover Depth ◽  
Minimum Cover ◽  
Geological Conditions ◽  
Dimensional Finite Element ◽  
The Cross ◽  
Three Dimensional Finite Element

With the development construction of subway in the city, the cross tunnel is becoming common. However, due to the geological conditions of the subway which limited the minimum depth of the shallow overburden of the tunnel is not the same. In this paper, according to the mechanical characteristics of the cross subway tunnel in several typical soil, a three-dimensional finite element mode is established. And to find out the discipline of minimum cover depth in vertical cross the tunnel by researching tunnel shield excavation the ground surface deformation characteristics.

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