scholarly journals Research on Mechanical Response of Pavement Structure to Differential Settlement of Subgrade on Highway Widening

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Quanjun Shen ◽  
Yu Lu ◽  
Yaohui Yang ◽  
Guanxu Long
Keyword(s):  
Finite Element ◽  
Tensile Stress ◽  
Mechanical Response ◽  
Element Model ◽  
Differential Settlement ◽  
Failure Strength ◽  
Pavement Surface ◽  
Practical Engineering ◽  
Pavement Structure ◽  
The Finite Element Model

Based on the widening project of Ri-Lan highway in China, the finite element model is established by PLAXIS. By applying differential settlement at the bottom of the pavement, the mechanical response of the pavement structure is analysed. Finally, the differential settlement control standard indicated by crack strength is proposed. The results show that, under the effect of differential settlement, within about 4 cm of old pavement surface and upper base bear tensile stress, the base first reaches the failure strength. Under 4 cm of the old pavement surface, the subbase first reaches the failure strength. The differential settlement control standard of the pavement structure is determined by the splitting strength of the material, and we, respectively, control the differential settlement of less than 23.4 mm, where the corresponding cross-slope rate is 0.33%, and below 75.2 mm, where the corresponding cross-slope rate is 0.54%. It could support practical engineering applications.

Analyzing the Influence of Road Reflection Crack on Pavement Structure under Transportation Loads through ANSYS

2012 ◽  
Vol 594-597 ◽  
pp. 2853-2857
Author(s):  
Dan Dan Li ◽  
Shi Sheng Zhou
Keyword(s):  
Stress Intensity Factor ◽  
Finite Element ◽  
Stress Intensity ◽  
Scientific Evidence ◽  
Element Model ◽  
Pavement Structure ◽  
Set Up ◽  
Basic Level ◽  
Reflection Crack ◽  
The Finite Element Model

This paper uses the ANSYS to set up the finite element model of the bituminous pavement after the reflection crack, through applying the transportation loads, calculating the stress of the pavement structure and the stress intensity factor, obtaining the influence of basic-level reflection crack on the pavement structure, to supply scientific evidence for the control of basic-level reflection crack and the improvement of the pavement structure.

Mass and Stiffness Matrices Updating Using the First Modal Data

2016 ◽  
Vol 851 ◽  
pp. 834-839
Author(s):  
Shi Qi Li ◽  
Zhe Zhang ◽  
Shi Ping Liu ◽  
Heng Zhang
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Modal Data ◽  
First Order ◽  
Stiffness Matrices ◽  
Real Model ◽  
Engineering Computation ◽  
Practical Engineering ◽  
The Difference ◽  
The Finite Element Model

This paper presents a new direct approach to simultaneously update the analytical mass and stiffness matrices in an undamped model .First, we assume that the difference between the finite element model and the real model is little. Second, only by utilizing the first order modal data orthogonal normalization conditions and eigen equations , we derive the updated matrices. Third, the method can maintain matrices symmetry and sparsity and preserve system connectivity. The merit of the proposed method is simple and accurate in a practical engineering computation. Finally,a numerical example is given to demonstrate the accuracy and effectiveness of the presented updating method.

Study on Mechanical Response Changes of Pavement to Aircraft Loads with Different Landing Gear Configurations

2015 ◽  
Vol 723 ◽  
pp. 60-64
Author(s):  
Wei Zhang ◽  
Qian Dong ◽  
Xian Min Zhang
Keyword(s):  
Finite Element ◽  
Mechanical Response ◽  
Element Model ◽  
Maximum Tensile Stress ◽  
Landing Gear ◽  
Mechanical Responses ◽  
Solid Foundation ◽  
Aircraft Loads ◽  
The Finite Element Model ◽  
Displacement Peak

The finite element model of runway is established based on elastic layered theory and it is used for analyzing the influence on mechanical responses due to changes of main landing gear configurations. The results show that the more the total number of wheels on a main landing gear is, the smaller displacement peak, maximum tensile stress under panel bottom and solid foundation influence depth are in conditions that aircraft loads are equal. When the landing gear spacing is smaller, the displacement curves in the loading area are gentler. The changes of configurations influence little on displacements in regions far away from loading area.

Numerical Study of Dynamic Response of Steel Deck Pavement on the Bascule Bridge

2010 ◽  
Vol 148-149 ◽  
pp. 1246-1249
Author(s):  
Yun Liu ◽  
Xin Yu ◽  
Zhen Dong Qian
Keyword(s):  
Finite Element ◽  
Mechanical Response ◽  
Steel Plate ◽  
Numerical Study ◽  
Element Model ◽  
Shear Stresses ◽  
Asphalt Paving ◽  
Steel Deck ◽  
The Finite Element Model ◽  
Opening Process

The bascule bridge is one of the most suitable bridge types for ports and rivers in cities. In order to discuss the mechanical behavior of the pavements in the opening process, the finite element model of the pavement system on the Haihe Bridge being built in Tianjin China was built, and the mechanical response in the opening process was calculated. The research results show that the asphalt paving with the thickness of 30mm~40mm is fit for the bascule bridge. The max shear stresses of pavement between pavement and steel plate in the opening process rise with the increase of Young’s modulus, and the high temperature during the construction and conservation after construction should be provided.

scholarly journals Analysis of Influence and Formation for Uncoordinated Deformation in Tram Subgrade

2019 ◽  
Vol 136 ◽  
pp. 04037
Author(s):  
Yang Cai ◽  
Chongwei Huang ◽  
Xi Chen ◽  
Yu Sun ◽  
Dandan Guo
Keyword(s):  
Finite Element ◽  
Tensile Stress ◽  
Finite Element Model ◽  
Mechanical Behavior ◽  
Compressive Stress ◽  
Mechanical Response ◽  
Element Model ◽  
The Other ◽  
3D Finite Element ◽  
Remarkable Effect

Aiming at horizontal and vertical uncoordinated deformation formation in Tram Subgrade, a 3D finite element model was established, which was used to analyse the mechanical response of tram monolithic roadbed on multiple depth and width of uncoordinated deformation. The results show that the uncoordinated deformation’s depth has little influence on the mechanical behavior of roadbed, and it indicates that there was remainder disengaging under the monolithic roadbed by the load of tram. On the other side, the width of uncoordinated deformation has a remarkable effect on outstanding to the horizontal tensile stress (σdy) in the slab bottom, deflection (Dd) on the top of slab, compressive stress (σsz) on the top of soil, and deflection (Dss) on the top of soil. The deflection on the top of subgrade surface is about 1.61mm. Therefore, the designer’s attention should be paid to avoid uncoordinated deformation width in the project, and avoid destroy of monolithic slab.

Redrawing Operation a Star Shape from Cylindrical Shape Using Experimental and FE Analysis

2020 ◽  
Vol 38 (1A) ◽  
pp. 25-32
Author(s):  
Waleed Kh. Jawad ◽  
Ali T. Ikal
Keyword(s):  
Finite Element ◽  
Effective Strain ◽  
Element Model ◽  
Cylindrical Shape ◽  
Element Analysis ◽  
Punch Force ◽  
Maximum Value ◽  
Element Simulation ◽  
Blank Sheet ◽  
The Finite Element Model

The aim of this paper is to design and fabricate a star die and a cylindrical die to produce a star shape by redrawing the cylindrical shape and comparing it to the conventional method of producing a star cup drawn from the circular blank sheet using experimental (EXP) and finite element simulation (FES). The redrawing and drawing process was done to produce a star cup with the dimension of (41.5 × 34.69mm), and (30 mm). The finite element model is performed via mechanical APDL ANSYS18.0 to modulate the redrawing and drawing operation. The results of finite element analysis were compared with the experimental results and it is found that the maximum punch force (39.12KN) recorded with the production of a star shape drawn from the circular blank sheet when comparing the punch force (32.33 KN) recorded when redrawing the cylindrical shape into a star shape. This is due to the exposure of the cup produced drawn from the blank to the highest tensile stress. The highest value of the effective stress (709MPa) and effective strain (0.751) recorded with the star shape drawn from a circular blank sheet. The maximum value of lamination (8.707%) is recorded at the cup curling (the concave area) with the first method compared to the maximum value of lamination (5.822%) recorded at the cup curling (the concave area) with the second method because of this exposure to the highest concentration of stresses. The best distribution of thickness, strains, and stresses when producing a star shape by

Analysis of Hydroelectric Unit’s Upper Bracket Based on Test and FEM

2014 ◽  
Vol 721 ◽  
pp. 131-134
Author(s):  
Mi Mi Xia ◽  
Yong Gang Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Element Model ◽  
The Finite Element Method ◽  
Ansys Software ◽  
Element Analysis ◽  
Hydroelectric Unit ◽  
The Finite Element Analysis ◽  
Strain Rosette ◽  
The Finite Element Model

To research the load upper bracket of Francis hydroelectric unit, then established the finite-element model, and analyzed the structure stress of 7 operating condition points with the ANSYS software. By the strain rosette test, acquired the data of stress-strain in the area of stress concentration of the upper bracket. The inaccuracy was considered below 5% by analyzing the contradistinction between the finite-element analysis and the test, and match the engineering precision and the test was reliable. The finite-element method could be used to judge the stress of the upper bracket, and it could provide reference for the Structural optimization and improvement too.

Analysis of Premium Connection of Connecting and Sealing Ability Loaded by Axial Tensile Loads

2012 ◽  
Vol 268-270 ◽  
pp. 737-740
Author(s):  
Yang Yu ◽  
Yi Hua Dou ◽  
Fu Xiang Zhang ◽  
Xiang Tong Yang
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Tensile Load ◽  
Element Model ◽  
Sealing Ability ◽  
Axial Tensile ◽  
High Level ◽  
Maximum Contact ◽  
Contact Pressures ◽  
The Finite Element Model

It is necessary to know the connecting and sealing ability of premium connection for appropriate choices of different working conditions. By finite element method, the finite element model of premium connection is established and the stresses of seal section, shoulder zone and thread surface of tubing by axial tensile loads are analyzed. The results show that shoulder zone is subject to most axial stresses at made-up state, which will make distribution of stresses on thread reasonable. With the increase of axial tensile loads, stresses of thread on both ends increase and on seal section and shoulder zone slightly change. The maximum stress on some thread exceed the yield limit of material when axial tensile loads exceed 400KN. Limited axial tensile loads sharply influence the contact pressures on shoulder zone while slightly on seal section. Although the maximum contact pressure on shoulder zone drop to 0 when the axial tensile load is 600KN, the maximum contact pressure on seal section will keep on a high level.

The structural optimization of roadheader conical picks based on fatigue life

2018 ◽  
Vol 09 (02) ◽  
pp. 1850013 ◽  
Author(s):  
Zhenguo Lu ◽  
Lirong Wan ◽  
Qingliang Zeng ◽  
Xin Zhang ◽  
Kuidong Gao
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Static Analysis ◽  
Element Model ◽  
Cutting Resistance ◽  
Strength Failure ◽  
New Type ◽  
Conical Picks ◽  
Fatigue Life Analysis ◽  
The Finite Element Model

Conical picks are the key cutting components used on roadheaders, and they are replaced frequently because of the bad working conditions. Picks did not meet the fatigue life when they were damaged by abrasion, so the pick fatigue life and strength are excessive. In the paper, in order to reduce the abrasion and save the materials, structure optimization was carried out. For static analysis and fatigue life prediction, the simulation program was proposed based on mathematical models to obtain the cutting resistance. Furthermore, the finite element models for static analysis and fatigue life analysis were proposed. The results indicated that fatigue life damage and strength failure of the cutting pick would never happen. Subsequently, the initial optimization model and the finite element model of picks were developed. According to the optimized results, a new type of pick was developed based on the working and installing conditions of the traditional pick. Finally, the previous analysis methods used for traditional methods were carried out again for the new type picks. The results show that new type of pick can satisfy the strength and fatigue life requirements.

Analysis of Packer Rubber Mechanics Properties

2014 ◽  
Vol 971-973 ◽  
pp. 380-389
Author(s):  
Jian Ning Wang ◽  
Gang Wu ◽  
Wei Yi Xie ◽  
Xin De Han ◽  
Ming Chao Gang
Keyword(s):  
Finite Element ◽  
Elastic Modulus ◽  
Constitutive Model ◽  
Contact Stress ◽  
Theoretical Basis ◽  
Element Model ◽  
Rubber Material ◽  
Bottom Hole ◽  
Sealing Performance ◽  
The Finite Element Model

Abstract: The packer rubber stress in the bottom hole is more complex. Based on constitutive model of the packer rubber material, this paper determines such parameters as model constants, Poisson's ratio of rubber materials and elastic modulus by using experimental method, to build up the finite element model of center tube-rubber cylinder-casing for the purpose of stress analysis. Finally, the distribution regularity of rubber cylinder-casing contact stress and packer setting travel distance with varying loads is concluded. The results can provide the theoretical basis for further analysis of packer rubber sealing performance.

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