Pull-out capacity of single batter piles in sand

1986 ◽  
Vol 23 (3) ◽  
pp. 387-392 ◽  
Author(s):  
A. M. Hanna ◽  
A. Afram
Keyword(s):  
Design Method ◽  
Soil Mechanics ◽  
Earth Pressure ◽  
Axial Loading ◽  
Test Results ◽  
Passive Earth Pressure ◽  
Sand Soil ◽  
Pull Out ◽  
Batter Piles ◽  
Good Agreement

The pull-out capacity of single rigid vertical and batter piles in sand and subjected to axial loading has been investigated. Good agreement was found when test results on instrumented model piles were compared with theoretical estimates. The effect of pile inclination on the pull-out capacity has been explained by means of variable mobilized passive earth pressure on the pile's perimeter. A design method and charts are presented. Key words: pile foundation, pull-out capacity, vertical pile, batter pile, sand–soil mechanics.

Numerical Simulation on the Behaviors of Post-Embedded Bars in Reinforced Concrete

2012 ◽  
Vol 598 ◽  
pp. 454-458
Author(s):  
Jian Hua Yang
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Slip Model ◽  
Test Results ◽  
One Dimensional ◽  
Pull Out ◽  
Interface Slip ◽  
Experimental Values ◽  
Anchor Design ◽  
Good Agreement

Prism pull-out test results was used to build anchorage bonding interface slip model(ABISM), with this model, the behaviors of post-embedded bars in reinforced concrete with different anchorage depth were analyzed by one-dimensional numerical method, and the calculation values was compared with the experimental values. The results showed that: the calculated value is in good agreement with the experimental values. this model can provides an important reference for anchor design.

Analytical study on the tensile stiffness of headed stud connectors

2018 ◽  
Vol 22 (5) ◽  
pp. 1149-1160 ◽  
Author(s):  
Fei Yang ◽  
Yuqing Liu ◽  
Chen Liang
Keyword(s):  
Tensile Force ◽  
Axial Displacement ◽  
Unknown Coefficient ◽  
Test Results ◽  
Tensile Stiffness ◽  
Pull Out ◽  
Concrete Blocks ◽  
Linear Spring ◽  
Headed Stud ◽  
Good Agreement

In the theoretical or numerical analysis of composite/hybrid structures, headed stud connectors at the steel–concrete interface are usually modelled as linear spring elements; thus, their tensile stiffness will be an essential parameter to affect the tensile force distribution. This article investigates the tensile stiffness of headed stud connectors through theoretical analysis combined with the existing pull-out test results. The pull-out displacement of headed stud connectors from concrete blocks mainly includes two parts: one part is the elastic elongation of the stud rod and another is the axial displacement of the stud head in concrete blocks resulted from the concrete elastic deformation. Mindlin’s solution is employed to predict the second part displacement with the introduction of an unknown coefficient, which is estimated based on the existing headed anchor pull-out test results. Subsequently, an equation for predicting the tensile stiffness of headed stud connectors is proposed. The predicting tensile stiffness for headed stud connectors with various stud heights presents a good agreement with the pull-out test results. Meanwhile, neglecting the axial displacement of the stud head in concrete blocks, especially for relatively short height headed studs, will produce an overestimated tensile stiffness.

Study on Vertical Earth Pressure of Slab Culvert under High Embankment

2012 ◽  
Vol 256-259 ◽  
pp. 1898-1902 ◽  
Author(s):  
Bao Kuan Ning ◽  
He Fan ◽  
Lei Gong ◽  
Guo Qing Liu
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Field Test ◽  
Structural Design ◽  
Earth Pressure ◽  
Test Results ◽  
Soil Pressure ◽  
Vertical Earth Pressure ◽  
The Impact ◽  
Good Agreement

With the increasing of embankment culvert engineering applications, there has been due in part to the structural design is too conservative and not economic or select unreasonable structural form, leading to the phenomenon of cracking or even collapse of the culvert structure, and the phenomenon has seriously affected the normal use of the highway. In this paper, the numerical simulation of vertical earth pressure distribution on different structural forms of embankment on culverts, to discuss the impact of boundary conditions, fill height, the thickness of the culvert culverts vertical earth pressure. Combined with Heda highway a culvert covert field test results and numerical simulation results were compared and analyzed. The results show that the numerical simulation and field test results in good agreement with the culvert structure in the form of vertical earth pressure of the embankment culverts have a greater impact; the structure of different forms of the culvert in the upper soil pressure is significantly different. In addition, analysis of the impact of boundary conditions, filling height of culvert vertical earth pressure values. The results can reference for the study of the structural design of the embankment culverts security.

Research of Semi-Step Walking Wheel Based on Vehicle-Terramechanics

2013 ◽  
Vol 409-410 ◽  
pp. 1435-1440
Author(s):  
Yi Bing Zhao ◽  
Lie Guo ◽  
Lin Hui Li ◽  
Ming Heng Zhang
Keyword(s):  
Ride Comfort ◽  
Soil Mechanics ◽  
Traction Force ◽  
Earth Pressure ◽  
Passive Earth Pressure ◽  
Lunar Rover ◽  
The Earth ◽  
Adams Software ◽  
Two Sides ◽  
Better Than

One new structure of Semi-step Walking Wheel Modeled on Impeller is constructed based on Vehicle-Terramechanics. Based on Passive earth pressure of soil mechanics put forward by C.A.Coulomb, the front force formula of the vane of Semi-step Walking Wheel modeled on Impeller is reduced and the wheel traction force when a set of vanes insert the earth is derived. Some Kinematics Simulations are conducted for installing Lunar rover model with ADAMS software. The simulation results show that the wheel can travel smoothly on straight road, climb over bump obstacles. Also, the ability of the lunar rover one-side surmounting obstacle is better than the ability of two-sides. The walking wheel inherits high ride comfort of traditional wheel and excellent cross obstacle ability of walking wheel.

The Bearing Capacity of Rigid Piles Under Inclined Loads in Sand. II: Batter Piles

1973 ◽  
Vol 10 (1) ◽  
pp. 71-85 ◽  
Author(s):  
G. G. Meyerhof ◽  
Gopal Ranjan
Keyword(s):  
Bearing Capacity ◽  
Previous Investigation ◽  
Test Results ◽  
Inclined Load ◽  
Inclined Loads ◽  
Loading Tests ◽  
Batter Piles ◽  
Laterally Loaded ◽  
Ultimate Resistance ◽  
Good Agreement

Following the previous investigation reported in the first part on vertical piles, this second part of the paper presents an analysis of the results of loading tests on rigid batter piles under inclined load in sand. The bearing capacity of axially loaded batter piles is discussed by comparing experimental results and theoretical estimates. The theory for ultimate resistance of rigid vertical piles under horizontal loads is extended to that of laterally loaded batter piles. Model test results are compared with those of theoretical estimates and good agreement is found. Methods of analysis of vertical piles under inclined loads are extended to those of rigid batter piles under inclined loads in sand and the analysis is compared with some test results.

scholarly journals Pipe–soil interaction model for current-induced pipeline instability on a sloping sandy seabed

2016 ◽  
Vol 53 (11) ◽  
pp. 1822-1830 ◽  
Author(s):  
Fu-Ping Gao ◽  
Ning Wang ◽  
Jinhui Li ◽  
Xi-Ting Han
Keyword(s):  
Limit Equilibrium ◽  
Slope Angle ◽  
Interaction Model ◽  
Earth Pressure ◽  
Model Verification ◽  
Soil Resistance ◽  
Passive Earth Pressure ◽  
Equilibrium Approach ◽  
Full Scale Tests ◽  
Good Agreement

As offshore exploitation moves to deeper waters, ocean currents become the prevailing hydrodynamic loads on pipelines, and at the same time a sloping seabed is always encountered. The prediction of lateral soil resistance is vital in evaluating pipeline on-bottom stability. Unlike previous pipe–soil interaction models used mainly for horizontal seabed conditions, a pipe–soil interaction model for current-induced downslope and upslope instabilities is proposed by using the limit equilibrium approach. The Coulomb’s theory of passive earth pressure for the sloping seabed is incorporated in the derivation. The model verification with existing full-scale tests shows good agreement between the experimental results and predicted ones. Parametric study indicates that the effect of slope angle on pipeline lateral soil resistance is significant in the examined range of slope angle from –15° to 15°. The critical pipeline embedment and corresponding passive pressure decrease approximately linearly with increasing slope angle.

Bearing Performance and Design Method of Aluminum Alloy Bolted Connections

2011 ◽  
Vol 71-78 ◽  
pp. 882-889 ◽  
Author(s):  
Yuan Qing Wang ◽  
Huan Xin Yuan ◽  
Yong Jiu Shi ◽  
Gui Xiang Zhang
Keyword(s):  
Aluminum Alloy ◽  
Design Method ◽  
Sheet Thickness ◽  
Test Results ◽  
Bolted Connections ◽  
Bolted Connection ◽  
End Distance ◽  
Screw Diameter ◽  
Primary Form ◽  
Good Agreement

Served as the primary form of joints in aluminum structures, the bolted connection is of great necessity to be investigated. The bearing performance of aluminum alloy bolted connections was evaluated by test and finite element (FE) analysis. A total of 20 bolted connections were tested and the varying parameters incorporated screw diameter and end distance. The test results included the ultimate bearing capacities and relationship between applied load and bolt hole deformation. Numerical simulation for the test process was implemented; thereupon reliability and accuracy of the FE models could be validated by good agreement with test results. By virtue of the verified numerical model, elaborated analysis of principle variables including inner and outer plies, end distance, screw diameter, sheet thickness and so on was carried out. Compared to the current overly conservative design rules, a new design method that could make full use of the bearing capacity was proposed. The corresponding design value of bearing strength was also presented with reference to the recommended constructional provisions.

Size effects in timber explained by a modified weakest link theory

1986 ◽  
Vol 13 (2) ◽  
pp. 218-232 ◽  
Author(s):  
Borg Madsen ◽  
Andrew H. Buchanan
Keyword(s):  
Size Effects ◽  
Design Method ◽  
Bending Test ◽  
Test Results ◽  
New Approach ◽  
Weakest Link ◽  
Link Theory ◽  
Tension Members ◽  
Depth Effects ◽  
Good Agreement

This paper represents a new approach to size effects in timber. The design process in Canadian Standards Association code CAN3-086-M80 allows for size effects in shear and in tension but not in bending. A large number of bending test results arc analyzed in this paper to show that size effects in bending are very important. A modification is made to the traditional weakest link theory for size effects to reflect the anisotropic nature of timber. Good agreement is obtained between tests and theory. The theory enables us to compare tests with different spans and (or) load configurations with an understanding not previously possible. Results from several large testing programs are used to quantify the theory. For bending members, length effects and load configuration effects are found to be much more important than depth effects, and a simple design method is proposed. Information for tension members is less comprehensive; nevertheless, a tentative suggestion for the design of those members is included.

Model for predicting displacement-dependent lateral earth pressure

2009 ◽  
Vol 46 (8) ◽  
pp. 969-975 ◽  
Author(s):  
Guoxiong Mei ◽  
Qiming Chen ◽  
Linhui Song
Keyword(s):  
Earth Pressure ◽  
The State ◽  
Passive State ◽  
Test Results ◽  
Lateral Earth Pressure ◽  
The Earth ◽  
Proposed Model ◽  
Pressure Changes ◽  
The Relationship ◽  
Good Agreement

A model for predicting displacement-dependent lateral earth pressure was proposed based on an earth pressure – displacement relationship commonly observed in practice. The proposed model is a monotonically increasing and bounded function, with an inflection point at the displacement of s = 0 at which the earth pressure changes from the intermediate active state (the state between active and at-rest) to the intermediate passive state (the state between at-rest and passive). The proposed model can predict the relationship between earth pressure and retaining structure movement for any condition intermediate to the active and passive states, which was verified by the experimental data reported in published literature. The predicted lateral earth pressure coefficients are in good agreement with the test results of model tests reported in the literature.

Profile Shifted Conical Involute Gear With Deep Tooth Depth

2007 ◽  
Author(s):  
Tatsuya Ohmachi ◽  
Atsushi Uchino ◽  
Hidenori Komatsubara ◽  
Makoto Saito ◽  
Kohei Saiki ◽  
...  
Keyword(s):  
Design Method ◽  
Test Results ◽  
Hypoid Gear ◽  
Shift Coefficient ◽  
New Concepts ◽  
Tooth Surfaces ◽  
Involute Gears ◽  
Conical Gears ◽  
Conical Gear ◽  
Good Agreement

This paper proposes a new design method for profile shifted conical gear with deep tooth depth. This method has two new concepts. First, this method is based on the designed pitch point where the rack shift coefficient is not zero. Second, this method is based on the theory of nonintersecting bevel gear such as hypoid gear, to decide the mounting dimensions of the profile shifted conical involute gears with deep tooth depth. The profile shifted conical involute gears have the designed pitch point that is not the standard pitch point. Limits of the rack shift coefficient and the facewidth, for the undercut and the zero top land, are clarified. Next, the production system is shown, and several typical test gears are manufactured. Paths of contact between tooth surfaces of profile shifted conical gears are obtained by tooth bearing tests. As a result, the measured value of limits of the rack shift coefficient and the facewidth on the manufactured tested gears are in good agreement with the theoretical ones. Moreover, test results of tooth bearing are in good agreement with the theoretical ones.

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