Study of Load Transfer Parameter in AASHTO Design Guide for Concrete Pavement

1998 ◽  
Vol 1629 (1) ◽  
pp. 1-5
Author(s):  
Chen-Ming Kuo
Keyword(s):  
Load Transfer ◽  
Three Dimensional ◽  
Design Parameters ◽  
Concrete Pavements ◽  
Element Analysis ◽  
Transfer Parameter ◽  
Dimensional Finite Element ◽  
Joint Width ◽  
Pavement Structures ◽  
Three Dimensional Finite Element

Some of the design parameters in AASHTO’s Guide for Design of Pavement Structures require experienced engineering judgment to obtain adequate designs. The load transfer parameter for concrete pavements in the AASHTO Guide is reviewed. A set of equations was developed to assist in choosing a J-factor for various pavement conditions. With three-dimensional finite element analysis, factorial runs were conducted to find the relationships between the critical stresses and joint design parameters—that is, joint width, diameter, length, and spacing of dowel bars. Extended procedures that incorporate dowel parameters into the J-factor were proposed. Conclusions were made to clarify the load transfer concept in the current AASHTO Guide and the effects of joint parameters on pavement performance.

Load Transfer Analysis of Cracked Bolted Joints

2010 ◽  
Vol 118-120 ◽  
pp. 147-150
Author(s):  
Da Zhao Yu ◽  
Yue Liang Chen ◽  
Yong Gao ◽  
Wen Lin Liu ◽  
Zhong Hu Jia
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Load Transfer ◽  
Three Dimensional ◽  
Element Model ◽  
Bolted Joints ◽  
Bolted Joint ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Three-dimensional finite element model of a cracked bolted joint has been developed in the non-linear finite element code MSC.Marc and attempts were made to validate it by comparing results with those of experiments and other finite element. Issues in modeling the contact between the joint parts, which affect the accuracy and efficiency of the model, were presented. Experimental measurements of load transfer were compared with results from finite element analysis. The results show that three-dimensional finite element model of cracked bolted joint can produce results in close agreement with experiment. Three-dimensional effects such as bolt titling, seconding and through-thickness variations in stress and strain are well represented by such models. Three-dimensional finite element analysis was also used to study the effects of hole mod and crack on the load transfer behaviour of single lap bolted joints. The results show that hole mode has big effect on load transfer of cracked bolted joint. In the whole progress of crack growth, the load transfer through bolt 1 decrease, and almost all of the load duduction of bolt 1 transfer into blot 2 rather than into bolt 3.

A Parametric Study on Particulate Al-SiC Composite Bolted Joints

2006 ◽  
Author(s):  
Samir N. Shoukry ◽  
Jacky C. Prucz ◽  
Gergis W. William
Keyword(s):  
Load Transfer ◽  
Three Dimensional ◽  
Closed Form Solution ◽  
Lap Joints ◽  
Form Solution ◽  
Bolted Joints ◽  
Design Parameters ◽  
Dimensional Finite Element ◽  
Sliding Interfaces ◽  
Three Dimensional Finite Element

The main objective of this study is to predict theoretically the stress distributions around the holes in a bolted joint made of particulate metal matrix composite and to investigate the associated load transfer efficiencies both for a single and double lap bolted joints. A three-dimensional finite element parametric model has been developed to examine the effects of various design parameters on the structural performance of such joints. The main feature of this model is explicit modeling of the sliding interfaces between the connected plates and the washers, and those between the hole and the bolt. The model response showed an excellent agreement with a closed form solution as well as experimental data. The results indicated that unsymmetric configuration of single lap joints causes bending as the load is applied, which is opposite of the double lap joints. This research quantifies the relationship between the stress developed around the hole and washer diameter, tightening pressure, and clearance between the bolt and hole. It was also observed that variations in Young's modulus have no significant effect on the stress concentration around the hole.

Effect of Dowel Looseness on Response of Jointed Concrete Pavements Using Three-Dimensional Finite Element Analysis

2014 ◽  
Vol 900 ◽  
pp. 435-444 ◽  
Author(s):  
How Bing Sii ◽  
Gary W. Chai ◽  
Rudi van Staden ◽  
Hong Guan
Keyword(s):  
Finite Element ◽  
Load Transfer ◽  
Three Dimensional ◽  
Element Analysis ◽  
Worst Case ◽  
Dimensional Finite Element ◽  
Loading Case ◽  
Wheel Loading ◽  
Base Course ◽  
Three Dimensional Finite Element

This paper evaluated an effect of dowel looseness on response of jointed concrete pavement using 3D finite-element analyses of rigid pavement systems that relies on an embedded formulation of a beam element. This embedded element allows the efficient modelling of dowel looseness using nodal contact approach and permits the dowels to be exactly located irrespective of the slab mesh lines. These studies indicate that significant reduction in load transfer efficiency and increase in both slab and base course stresses can be expected due to small gaps varies from 0.25 to 1.25mm between the dowels and the slabs. For the worst case the LTE were reduced to 11.3% and 11.6% respectively for single wheel loading and odd dual wheel loading case while there were voids present at the base course layer for 1.25 cases 4.

Dynamic Impact Simulation Study of Tubeless Pneumatic Tires

2016 ◽  
Author(s):  
Floyd Linayao ◽  
Raymond K. Yee
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Design Parameters ◽  
Inflation Pressure ◽  
Element Analysis ◽  
Finite Element Program ◽  
First Case ◽  
Dimensional Finite Element ◽  
Element Program ◽  
Three Dimensional Finite Element

Traditionally speaking, prototype tires are designed, and then tested on an experimental basis to evaluate performance. Using finite element analysis instead allows tire design parameters to be modified at will and underperforming architectures to be ruled out. This paper characterizes the dynamic response of a tubeless pneumatic vehicle tire as it is exposed to sudden impact and determines conditions under which failure would occur. Three cases were studied using a 175SR14 passenger tire, since passenger tires are most commonly used and impacts are more substantial on smaller tires. ABAQUS finite element program was used to perform nonlinear transient dynamic three-dimensional finite element analyses for three commonly tire encountered conditions. The first case, direct curb impact, determined that a safe inflation pressure range for tire velocities exists between 10 and 60 km per hour (kph). The second case, angled curb impact, found a smaller range of 10 to 40kph. The third case, impact with a pothole, found that at low inflation pressures, less stress is produced at higher velocities; increasing inflation pressure results in a transition point, causing larger stresses to be produced at higher velocities. From these analyses, several conclusions are drawn: inflation pressures below 100KPa do not produce a useful relationship between tire velocity and stress; thicker sidewalls help shield the tire from impact failure; and it is better for the tire to accelerate past a pothole in the 30 to 70kph range.

Influence of the Dispensation of Transfer Bar to the Load Coefficient at Concrete Pavement Seam

2013 ◽  
Vol 392 ◽  
pp. 895-899
Author(s):  
Fang Ran Zhao ◽  
Ye Ming Li
Keyword(s):  
Finite Element ◽  
Load Transfer ◽  
Three Dimensional ◽  
Element Model ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Cement Concrete Pavement ◽  
Dimensional Finite Element ◽  
Joint Width ◽  
Three Dimensional Finite Element

The airport cement concrete pavement seam is very important to the bearing capacity and Flatness. Considering the importance of seams, a detailed three-dimensional finite element model was used to investigate the state of seams. According the calculation method of load transfer coefficient, the coefficient was obtained. Comparing the different coefficient, the best position of dowel steels, the best diameter of dowel steels, the best buried depth of dowel steels and the best joint width of dowel steels all can be gained best joint width of dowel steels all can be gained.

scholarly journals Analysis of Embankment Supported by Rigid Inclusions Using Plaxis 3D

2021 ◽  
Author(s):  
Rashad Alsirawan
Keyword(s):  
Rigid Inclusion ◽  
Load Transfer ◽  
Soft Soil ◽  
Three Dimensional ◽  
Field Measurements ◽  
Soil Arching ◽  
Element Analysis ◽  
Soft Soils ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

A rigid inclusion-supported embankment is used to overcome the problems of soft soils. This system is considered complex due to the various interactions between its elements, namely the embankment body, load transfer platform, geogrid layers, piles, and soft soils. The load transfer mechanism is based on the phenomenon of soil arching, the tension in the geogrid layers, support of the soft soils, and friction between piles and soft soil. In this paper, the first part highlights the behaviour of a rigid inclusion-supported embankment validated by field measurements, and the contribution of rigid inclusions technology to the reduction of settlement and creep settlement. In addition, the effect of geogrid in improving the load efficiency and reducing the settlements is presented. In the second part, a comparison is made between many analytical design methods and a three-dimensional finite element analysis method. The results show the inconsistencies between the analytical methods in calculating the load efficiency and the tension in the geogrid.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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