The Dowel Group Action in Jointed Concrete Pavement

2012 ◽  
Vol 622-623 ◽  
pp. 1892-1895
Author(s):  
Yi Qiu Tan ◽  
Yun Liang Li ◽  
Luo Ke Li ◽  
Zhong Jun Xue
Keyword(s):  
Group Action ◽  
Shear Force ◽  
Load Transfer ◽  
Concrete Pavement ◽  
Force Distribution ◽  
Shear Load ◽  
Concrete Pavements ◽  
Wheel Load ◽  
Jointed Concrete Pavement ◽  
Dowel Bar

The wheel load transfer across a joints in concrete pavement is accomplished mainly by dowel bar system, dowels are installed in order to allow shear load transfer across slab joints. The dowel group action has been examined in this paper via from using of 3-D FE mode. Numerical model results are presented in four formats in this study, including shear force diagram, load transfer ratio by shear force, dowel shear force distribution and dowel shear ratio. The relationships between applied wheel load and dowel group action will be useful in the design and evaluation of dowel jointed concrete pavements.

Development of Prediction Model for Doweled Joint Concrete Pavement Using Three-Dimensional Finite Element Analysis

2014 ◽  
Vol 587-589 ◽  
pp. 1047-1057 ◽  
Author(s):  
How Bing Sii ◽  
Gary W. Chai ◽  
Rudi Van Staden ◽  
Hong Guan
Keyword(s):  
Prediction Model ◽  
Group Action ◽  
Shear Force ◽  
Load Transfer ◽  
Nodal Point ◽  
Three Dimensional ◽  
Load Testing ◽  
Element Analysis ◽  
Three Dimensional Finite Element ◽  
Dowel Bar

The load transfer mechanism between the dowel and the concrete is a complex phenomenon. This mechanism depends mainly on a parameter known as the modulus of dowel support (K), the value of which can be determined by load testing. A high modulus of dowel support value indicates a good contact between the concrete and the steel dowel. There is a lack of sound approach to identify with any degree of accuracy the modulus of dowel support (k), which makes it difficult to rely on the analytically developed formulas that are sensitive to its value. The obtained numerical results were validated with classical analytical solutions of shear and moment along the dowel. The group action of the dowel bar system was examined and useful relationships have been developed for estimation of the relative load shared by individual dowel bars. These useful relationships have been used to developed prediction Model to predict the shear force in dowel group action of dowel bar system and deflection at the loading nodal point. The prediction Model results for shear force in dowel group action of dowel bar system and deflection at the loading nodal point were relatively close to the F.E. Model results, with the different range between 2.2% to 7%.

scholarly journals Effectiveness of Dowels in Concrete Pavement

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1669 ◽  
Author(s):  
Jiri Grosek ◽  
Andrea Zuzulova ◽  
Ilja Brezina
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Load Transfer ◽  
Plain Concrete ◽  
Concrete Pavement ◽  
Successful Outcome ◽  
Concrete Pavements ◽  
The Finite Element Method ◽  
Improve Performance ◽  
Direct Measurements

Dowels are located in transverse joints of Jointed Plain Concrete Pavements (JPCP) and they are used to provide load transfer between individual slabs, reduce faulting and improve performance. Dowels and the concrete itself are under the highest stress in the vicinity of joints; thus, in terms of pavement design, the joints are the weakest points of the whole structure. This study dealt with the drawbacks of JPCP with dowels. The evaluation was based on direct measurements on real airport and motorway pavements and highlights insufficient efficiency of load transfer and its possible causes. The authors present a successful outcome with validation by using the finite element method where high tensile stress values of the surrounding concrete were found.

scholarly journals SHEAR STRENGTH OF THIN WEB – INFLUENCE OF LIGHTING OPENINGS AND DIAGONAL TENSION

Aviation ◽  
2016 ◽  
Vol 20 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Marek HORÁK ◽  
Antonín PÍŠTĚK
Keyword(s):  
Shear Strength ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Shear Force ◽  
Force Distribution ◽  
Shear Load ◽  
Thin Beam ◽  
Post Buckling ◽  
The Web

This article provides information about stress analysis of thin beam webs with and without lighting openings. The study described in this paper was carried out in order to investigate the influence of circular lighting openings in planar webs on critical web shear force, distribution of transverse web deformations, and also strain and stress distribution in the web plate. The main goal was to compare pre- and post-buckling behaviour of a thin web with and without lighting openings under shear load.

Analysis of Factors Influence on Void Underneath at Concrete Pavement Joints

2014 ◽  
Vol 488-489 ◽  
pp. 483-486
Author(s):  
Fang Ran Zhao ◽  
Jia Lin Cao ◽  
Ning Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Load Transfer ◽  
Three Dimensional ◽  
Transfer Effect ◽  
Concrete Pavement ◽  
Element Analysis ◽  
Joint Stress ◽  
Transverse Joint ◽  
Dowel Bar

Three-dimensional finite element analysis was made on the transverse joint stress state of the concrete pavement slab with void underneath using ANSYS. The transfer effect of dowel bar was discussed with aircraft loaded in the joints. The influence rule of load transfer effect under different dowel bar spacing and dowel bar cross section dimension was compared. Based on the results of finite element analysis, this paper had carried on the experimental study on stress-transferring effect on concrete pavement joints with different location of the dowel bar. The influencing factors of pavement slab transverse joint with void underneath and the resistance of pavement damage on the joint was analyzed. Theoretical analysis showed that in order to reinforce the resistance capacity of local cavity on concrete pavement joint, the largest spacing of transverse dowel bar set shall not be more than 45cm, and the main factors influencing the resistance void ability on the joint are top reaction modulus, coefficient of cavity, the concrete elastic modulus and coefficient of transverse reinforcement.

scholarly journals Mechanical Behavior of Concrete Pavement considering Void beneath Slabs and Joints LTE

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Bangyi Liu ◽  
Yang Zhou ◽  
Linhao Gu ◽  
Dalin Wang ◽  
Xiaoming Huang
Keyword(s):  
Load Transfer ◽  
Joint Stiffness ◽  
Plain Concrete ◽  
Concrete Pavement ◽  
Concrete Pavements ◽  
Void Size ◽  
Fea Model ◽  
Base Course ◽  
Load Transfer Efficiency ◽  
Mesh Convergence

Dowel bars are arranged between two slabs of jointed plain concrete pavements to transfer load between them. The looseness of these dowel bars leads to the decrease of the load transfer efficiency (LTE). Meanwhile, repeated vehicle load can result in void near the joints. In this paper, the behaviors of concrete pavement under the effect of void size and joint stiffness were studied by using ABAQUS software. The FEA model was calibrated for different element parameters based on mesh convergence analysis and validated by comparison with previous studies. The voids beneath slabs were considered in this study, including the loaded slab and unloaded slab. The different effects of base course modulus on the stress of loaded slab are also analysed. It is concluded that the results show that the void size and joint stiffness affect the stress of the loaded plate. Smaller void size and larger joint stiffness will lead to the maximum stress located at the bottom of the loaded slab, and the void size has little effect on the stress of the loaded slab. Otherwise, the larger void size will cause larger stress. The effect of base modulus on stress is similar.

Analysis of Ultimate Load-Bearing Capacity for Dowel Bar System in Rigid Pavement Based on XFEM

2013 ◽  
Vol 444-445 ◽  
pp. 961-965
Author(s):  
Luo Ke Li ◽  
Yi Tang Zhou ◽  
Peng Cao ◽  
Yi Na Wang
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Fracture Process ◽  
Model Simulation ◽  
Accurate Method ◽  
Concrete Pavement ◽  
Element Analysis ◽  
Rigid Pavement ◽  
Jointed Concrete Pavement ◽  
Dowel Bar

In order to analyze the premature damage of dowel bar system in jointed concrete pavement, the eXtended finite element method (short for XFEM) coupled with submodeling method were employed to simulate the fracture process of concrete around the dowel bar under loading. This coupling method is based on 3-D finite element analysis for the whole concrete pavement structure. The initialization and evolution of the cracks on the concrete had been monitored in model simulation. The results demonstrate that the XFEM coupled with submodeling method is an efficient and accurate method to calculate the ultimate bearing capacity of dowel bar. Furthermore, the critical axle load could be back-calculated based on the former analyzing results. This study is expected to provide a valuable numerical analysis method to simulate the fracture process in stresses concentration region of the concrete structure.

scholarly journals Modeling of Dowel Jointed Rigid Airfield Pavement under Thermal Gradients and Dynamic Loads

2016 ◽  
Vol 2 (2) ◽  
pp. 38-51 ◽  
Author(s):  
Ahmed Ebrahim Abu El-Maaty ◽  
Ghada Mousa Hekal ◽  
Eman Muhammed Salah El-Din
Keyword(s):  
Load Transfer ◽  
Design Procedure ◽  
Aviation Industry ◽  
Thermal Gradients ◽  
Concrete Pavements ◽  
Design Procedures ◽  
Jointed Concrete Pavement ◽  
Sensitivity Studies ◽  
Load Transfer Efficiency ◽  
Verification Process

Concrete pavements have been widely used for constructing runways, taxiways, and apron areas at airports. The aviation industry has responded to increased demand for air travel by developing longer, wider, and heavier aircraft with increasing numbers of wheels to support the aircraft while in ground operation. Many researchers developed their models based on the finite element method (FEM) for the analysis of jointed concrete pavement. Despite the notable improvement, important considerations were overlooked. These simplifications may affect the results of the developed models and make them unrealistic. Sensitivity studies were conducted in this study to investigate the effect of the loading parameters on the load transfer efficiency (LTE) indictors where concept of LTE is fundamental in airfield design procedures.  The effect of main gear loading magnitudes in different wheel configurations combined with positive and negative thermal gradients was investigated. The verification process was presented to increases the confidence in the model results. Understanding the response of rigid airfield pavement under such circumstances is important developing a new pavement design procedure, as well as implementing a suitable remedial measure for existing pavements. The results obtained that utilizing a dynamic load allows studying the fatigue cycles that pavement can be subjected under different wheel configurations.   Moreover, the change in the thermal gradient from positive to negative significantly changed the slab curvature shape.

Effect of Concrete Mix Consolidation on Joint Faulting and Load Transfer Efficiency

1996 ◽  
Vol 1544 (1) ◽  
pp. 3-8
Author(s):  
Mustaque Hossain ◽  
John B. Wojakowski
Keyword(s):  
Load Transfer ◽  
Plain Concrete ◽  
Concrete Pavement ◽  
Transfer Efficiency ◽  
Unit Weight ◽  
Concrete Pavements ◽  
Falling Weight Deflectometer ◽  
Rate Of Increase ◽  
Load Transfer Efficiency ◽  
Falling Weight

Six jointed reinforced concrete pavement and one jointed plain concrete pavement test sections on US-69 in Miami County, Kansas, constructed in 1979 have been surveyed annually for faulting for the past 9 years. Falling weight deflectometer tests were conducted in 1995 to assess the load transfer efficiency of the joints. The results show that, in general, as the original concrete density increases due to improved consolidation, the rate of increase of the joint fault depth decreases at doweled joints at a given pavement age. The occurrence of joint faulting is much more severe when load transfer devices are not present; this was observed even for the pavement section built on a nonerodible subbase. Improved consolidation sometimes appeared to help improve load transfer, resulting in a lower rate of faulting. Thus, the mandatory density requirement of 98 percent rodded unit weight, which has been in effect since 1980, has undoubtedly led to better joint performance for concrete pavements in Kansas.

Sign in / Sign up

Export Citation Format

Share Document