Dynamic Response of Pavement Plates to the Positive and Negative Phases of the Friedlander Load

Int. J. Adv. Sci. Eng. Inf. Technol.

Asmi²,

Safrilah³

et al. 2020

The increasing number of terrorist attacks in recent years have shown that in designing structures such as floor slabs and rigid roadway pavement, the effect of blast loads should be taken into consideration. In this study, we analyze the blasting effect on the rigid roadway pavements and provide a numerical example of a toll road shoulder section exposed to this blast load. We assumed that the rigid roadway slab is connected by dowels and tie-bars along its edges. Furthermore, we modeled the blast as a Friedlander blast load, where it is initially a positive pressure before decreasing to a negative pressure due to drag. We obtained the vertical shear force that is carried by the dowels and tie-bars along its edges, the time history of the rigid roadway slab deflection, and identified the parameters of the sub-grade that has significant effects on the dynamic response of the rigid roadway pavement. We carried out the numerical analysis using the first and the second type of Levy's problem to find the Eigenvalues and Eigenvectors and to predict the maximum deformed shape, the maximum vertical shear forces along the joint of the rigid roadway pavement subjected to the blast load. Our results show that the duration ratio of the blast loading, the thickness of the slab, and the stiffness coefficient of the soil has a significant influence on the dynamic response of the slab. This paper provides essential techniques in increasing the capacity of a rigid roadway slab against explosive effects.

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of a Friedlander Localized Blast Load on a Rigid Roadway Pavement Using Levy’s Problem

Int. J. Adv. Sci. Eng. Inf. Technol.

Asmi²,

Safrilah³

et al. 2020

“…The combined effects of the moving load to the thickness of the rigid roadway pavement as well as the type of soil underneath the rigid roadway pavement to the maximum vertical deflection and the distribution of the stresses within the rigid roadway pavement region were determined in this study. The rigid concrete pavement sitting on elastics Pasternak foundation is modeled by using the Kirchhoff theory of thin plates that can be expressed by [7] (1) where Dx is the flexural rigidity of plate in the x-direction; B is the torsional rigidity of plate, Dy is the flexural rigidity of plate in the y-direction,  is the mass density of plate, h is the thickness of plate,  is the damping ratio of plate, Gs is shear modulus of Pasternak foundation, kf is the stiffness coefficient of Pasternak foundation and f(x,y,t) is the vehicle load.…”

Section: Introductionmentioning

confidence: 99%

Stress Analysis in Rigid Roadway Pavement With Discontinuities Subjected to Vehicle Movement

International Journal of Civil Engineering and Technology (Ijciet)

Anon²,

Pratama³

et al. 2020

Rigid concrete pavements subjected to several types of dynamic loading such as the vehicle movement loading that may result in joint cracking due to this type of loading. The objective of this study was to develop the modified Bolotin model of the rigid pavement to assess the vertical deflection, the flexural stress of the plate as well as the performance of dowel in rigid concrete pavement. The discontinuity between the plate is using dowels that restrain the rotation and the vertical deflection along the edges. The first and second type of Levy's problems is used to find eigenvectors of the pavement, while the eigenvalues are found from the transcendental equations in the xand y-directions. Important factors that include the combined effects of loading velocity and the diameter of dowel are frequently ignored in most of the recent works. To overcome the inadequacies of the recent works, the present study investigated the rigid roadway pavement stress distribution under the effect of some model parameters. The results of the present study were verified by comparing with the other methods results from the recent study. Results showed that the stress distribution along the edges depends on the diameter of the dowel, the thickness of the rigid roadway pavement, and the soil conditions beneath it. In conclusion, to identify the effects of different features which include the geometry of the pavement, material properties the pavement and movement behavior of vehicles to the structural responses of rigid roadway pavement, the modified Bolotin method developed in the present study is suitable.

“…(4) and(5) is carried out in this section. The generalized solution of the spatial function is defined as the multiplication of the function ( ) and ( ) as follows[10]:…”

mentioning

confidence: 99%

Numerical simulation of vehicle movement on rigid roadway pavement with discontinuities

Asmi²,

Safrilah³

et al. 2019

J. vibroeng.

A numerical simulation of a moving vehicle on the rigid roadway pavement with discontinuities is presented in this paper by using the data from one of the toll road segments in Indonesia. The analysis procedure considers the dynamic interaction between the vehicle and the rigid pavement. The rigid roadway pavement is modeled using the Kirchhoff theory of thin slab on elastic foundations. The aim of the numerical analysis is to obtain the vertical deflection in the middle of the slab, to obtain the time history of the slab deflection; and to identify the parameters of the sub-grade that has a significant effect on the dynamic response of the rigid roadway pavement. The equations of motion are derived in the form of partial differential equations of the fourth order. The mode shapes of the slab deflection are determined from the method of first and the second auxiliary equations of Levy-type in the-and-directions, which is also known as the Modified Bolotin Method (MBM). The equations of motion are solved numerically by using Mathematica. The influence of various parameters including the peak vertical velocity due to the moving vehicle, the stiffness of subgrade, the slab thickness and the road profile to the dynamic behavior of the rigid roadway pavement are studied in detail. The results obtained from the plate computing model in this paper are then compared and analyzed with the results computed using the finite element method by Strand 7 to show that the solution obtained using the MBM method is accurate. In addition, the paper aims to show that the thickness of the plate plays a significant role in the distribution of the bending stresses in plate discontinuities and is necessary for engineers to design rigid roadway pavements.