Thermal Stress Analysis for Bi-modulus Foundation Beam under Nonlinear Temperature Difference

2017 ◽  
Vol 14 (01) ◽  
pp. 1750024 ◽  
Author(s):  
Jinling Gao ◽  
Wenjuan Yao
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Mechanical Response ◽  
Bending Moment ◽  
Neutral Axis ◽  
Calculation Procedure ◽  
Winkler Foundation ◽  
Linear Temperature ◽  
Finite Element Software ◽  
Nonlinear Temperature

It is shown that many materials in practical engineering have different moduli in tension and compression. Especially, graphene, a magical material with the highest strength, is a kind of bi-modulus material. In this paper, mechanical response of bi-modulus Winkler foundation beam under nonlinear temperature distribution along height of the beam is studied. A new and convenient method, “intersecting line criterion”, is proposed to certify number of neutral axis in foundation beam and governing equation (set) of position of neutral axis is established, which is solved by iteration procedure of Newton’s method in Matlab. Semi-analytical solutions of stress, deflection and bending moment are subsequently obtained. Meanwhile, a finite element calculation procedure for calculating the temperature stress in bi-modulus structures is developed. Return the analytical solution to the result of the same modulus theory, and compare the analytical solution with finite element procedure solution and common finite element software Abaqus simulation solution. It shows that both of semi-analytical solution and calculation procedure proposed are reliable to use. Finally, discrepancies between nonlinear temperature effect and linear temperature and external force effect are discussed, which may supply some suggestions for calculation and optimization of such structures and members.

Finite Element Analysis on Incremental Launching Construction for Steel Box Girder

2013 ◽  
Vol 671-674 ◽  
pp. 974-979
Author(s):  
Jie Dai ◽  
Jin Di ◽  
Feng Jiang Qin ◽  
Min Zhao ◽  
Wen Ru Lu
Keyword(s):  
Finite Element ◽  
Bending Moment ◽  
Internal Force ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Steel Box Girder ◽  
Maximum Value ◽  
Negative Bending

For steel box girder of cable-stayed bridge, which using incremental launching method, during the launching process, structural system and boundary conditions were changing, structure mechanical behaviors were complex. It was necessary to conduct a comprehensive analysis on internal force and deformation of the whole structure during the launching process. Took a cable-stayed bridge with single tower, double cable planes and steel box girder in China as an example; finite element software MIDAS Civil 2010 was used to establish a model for steel box girder, simulation analysis of the entire incremental launching process was carried out. Variation rules and envelopes of the internal force, stress, deformation and support reaction were obtained. The result showed that: the maximum value of positive bending moment after launching complete was 60% of the maximum value of positive bending moment during the launching process. The maximum value of negative bending moment after launching complete was 78% of the maximum value of negative bending moment during the launching process.

Study on Finite Element Model of Bridge Multi-Pile Foundation

2010 ◽  
Vol 456 ◽  
pp. 103-114
Author(s):  
Shi Ling Xing ◽  
Jian Shu Ye ◽  
Hang Sun
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Pile Foundation ◽  
Bending Moment ◽  
Highway Bridges ◽  
Element Model ◽  
Boundary Constraints ◽  
Finite Element Software ◽  
Friction Pile ◽  
The Finite Element Model

In order to use finite element software to complete the design or calculation of bridge multi-pile foundation, this paper discusses the finite element model (FEM) of a bridge multi-pile based on the theory and provisions in Code for Design of Ground Base and Foundation of Highway Bridges and Culverts (CDGBFHBC 2007) of china. For the FEM of a bridge-multi pile foundation, cap is regarded as a rigid body, piles are taken as beams, and boundary constraints are a series of horizontal springs and vertical springs. First, the formula of stiffness for horizontal springs and bottom vertical spring is derived according to elastic ground base theory and winkler hypotheses. Secondly, for the friction pile, the stiffness of vertical springs on piles side is derived basis of the principle of friction generated and simplified distribution of pile shaft resistance. Then, the FEM of multi-pile needs pay attention to three issues: the simulation of connections between piles and cap, elastic modulus needs discount, and the weight for pile underneath the ground line (or local scour line) needs calculate by half. Taking pile section bending moment often control the design and calculation of pile into account, this paper gives a simplified FEM of pile. Finally, an example is used to introduce the application of the FEM of bridge multi-pile foundation.

Research on Fatigue Life Assessment of Fiber Glass Reinforced Flexible Pipe

2019 ◽  
Author(s):  
Yong Bai ◽  
Jiannan Zhao ◽  
Xinyu Sun ◽  
Xiaojie Zhang ◽  
Zhao Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Fatigue Life ◽  
Bending Moment ◽  
Life Assessment ◽  
Fiber Glass ◽  
Flexible Pipe ◽  
Flow Method ◽  
Finite Element Software ◽  
Time Histories

Abstract Fiber glass reinforced flexible pipe (FGRFP) is a kind of submarine pipe widely used in oil and gas transportation and exploration. This paper mainly studies the theoretical and numerical simulation methods for calculating the fatigue life of the FGRFP. Firstly, the tension time-histories and bending moment time-histories of the FGRFP are obtained by using global analysis. The tension and bending moment frequency distribution histograms are obtained by using rain flow method. Then, the finite element software ABAQUS is used to build the model of the FGRFP, and the corresponding tension and bending moment are applied on the finite element model. Then, the stress time histories curve of the FGRFP is obtained. By comparing the results of numerical simulation, the main factors affecting the fatigue life of the FGRFP are studied. Finally, according to rain flow method, S-N curve and numerical simulation results, the fatigue life and single damage rate of FGRFP are obtained.

scholarly journals Research on the Arrangement Form of Net Suspenders with Constant Inclination Angle for Steel Box Tied Arch Bridge

2020 ◽  
Vol 165 ◽  
pp. 04039
Author(s):  
Teng Ma ◽  
Jingkai Zhao ◽  
Dafang Mei
Keyword(s):  
Finite Element ◽  
Inclination Angle ◽  
Bending Moment ◽  
Structural Stress ◽  
Arch Bridge ◽  
Finite Element Software ◽  
Reduction Efficiency ◽  
The Moment ◽  
Tied Arch Bridge ◽  
The Ideal

In order to explore the rational suspender layout of reticulated suspender steel box tied arch bridge, eight different suspender layout schemes were established by using finite element software Midas civil, taking a real bridge as the background and the constant inclination angle of suspender as the research variable. The structural stress characteristics of vertical suspender and reticulated suspender layout were analyzed and compared. The results show that the bending moment of arch rib and tied beam of reticulated suspender system is smaller, and the stress of arch beam is closer to the ideal state of “arch rib is compressed, tied beam is pulled”. The results show that in the range of 60 ~90, the smaller the inclination angle is, the more favorable the stress of the structure is, but the lower the moment reduction efficiency is when the inclination angle of the suspender is less than 60.

The Analysis of Rotary Kiln Thermal Characteristics Based on ANSYS and FLUENT

2013 ◽  
Vol 834-836 ◽  
pp. 1523-1528
Author(s):  
Xiao Yan Song ◽  
Qin Fan
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Rotary Kiln ◽  
Mechanical Response ◽  
Coupling Effect ◽  
Interpolation Method ◽  
Combustion Process ◽  
Gas Temperature ◽  
Finite Element Software ◽  
Operation Conditions

In this paper, the FLUENT finite element software is used to simulation analyze the rotary kiln, kiln gas combustion process and gas-solid coupling effect. The kiln and rotary kiln of gas temperature field is calculated and then imported into the ANSYS software as an initial condition to complete the reconstruction of the temperature field and using the node interpolation method to carry out thermal stress analysis. Through the joint simulation analysis based on FLUENT and ANSYS finite element software, the analysis of rotary kiln combustion process, the heat transfer and the mechanical response of the structure can be implemented under the same condition, making the simulation results of rotary kiln more related to practical operation conditions. The method and results presented have significant theoretical guidance for the research and development of new types of rotary kiln.

Temperature stress for bending beam with different moduli under different constraints

2014 ◽  
Vol 10 (2) ◽  
pp. 163-175
Author(s):  
Wenjuan Yao ◽  
Jiankang Liu
Keyword(s):  
Analytical Solution ◽  
Normal Stress ◽  
Temperature Stress ◽  
Compression Modulus ◽  
Maximum Tensile Stress ◽  
Neutral Axis ◽  
Exploratory Research ◽  
Content Type ◽  
Nonlinear Temperature ◽  
Moduli Theory

Purpose – The purpose of this paper is to solve temperature stress for bending beam with different moduli under different constraints subject to nonlinear temperature. Design/methodology/approach – The equations of neutral axis position, normal stress, and displacement of bending beam with different moduli subjected to nonlinear temperature were derived based on different moduli elasticity theory. Meanwhile, iterative procedure was programmed to solve the nonlinear equations. The analytical solution can return back into the result of the same modulus theory, and the analytical solution was compared with finite element numerical solution. It shows that the analytical model proposed in this paper is reliable to use. Furthermore, the influence of different moduli characteristics on the temperature stress and deformation is discussed. Findings – The mechanical behavior of the bending beam with different moduli subject to nonlinear temperature is quite different from the one that is subjected to force. The bending beam maybe exist two neutral axis, and the reasonable selection of tension modulus and compression modulus can improve the distribution of the normal stress and reduce the maximum tensile stress or the maximum compressive stress. Originality/value – The crack produced by temperature stress will affect the integrity and the durability of the structure. The solution for temperature problem with different moduli theory is rarely reported at home and board. In view of this, this paper will do some exploratory research-temperature stress for bending beam with different moduli.

A unified relaxed approach easing the practical application of a paradox in curved beams

2020 ◽  
Vol 234 (22) ◽  
pp. 4535-4542 ◽  
Author(s):  
HMA Abdalla ◽  
D Casagrande ◽  
A Strozzi
Keyword(s):  
Finite Element ◽  
Stress Reduction ◽  
Normal Force ◽  
Bending Moment ◽  
Neutral Axis ◽  
Mathematical Approach ◽  
Bending Stress ◽  
Practical Application ◽  
Curved Beams ◽  
Closed Form Solutions

The paper deals with an arising paradox in curved beams subjected to bending moment and normal force. This paradox consists in the fact that by laterally removing material from section zones close to the neutral axis, not only an obvious reduction of the beam mass can be obtained, but also an unexpected, though technically negligible, reduction of the bending stress. It has recently been shown that the relaxation of the demanding achievement of a concurrent mass and stress reduction may practically lead to interesting results, yet solvable numerically. In this paper we show that, under some mild assumptions, a remarkable simplification of the intrados stress functional is obtained. Hence, a unified approximate mathematical approach based on linearization is developed for the derivation of analytical closed-form solutions for the lateral grooved zones. A practical example of the application of the relaxed paradox to optimize a crane hook subjected to bending and normal force is illustrated and compared to finite element forecasts.

A Method for Determining the Value of m Based on PLAXIS Nonlinear Finite Element Analysis

2011 ◽  
Vol 250-253 ◽  
pp. 1483-1488
Author(s):  
Jin Song Gui ◽  
Zhen Guo Li ◽  
Qing Meng ◽  
Bo Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bending Moment ◽  
Nonlinear Finite Element Analysis ◽  
Internal Force ◽  
Nonlinear Finite Element ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Finite Element Software ◽  
Selection Of

The value selection of m has a greater influence on the internal force of pile. So, how to determine the value of m is very important for the “m” method. In this paper, a geotechnical finite element software PLAXIS is used for the nonlinear finite element analysis of elastic long pile under the horizontal force action. By using the calculated maximum bending moment and the maximum displacement at the ground, and combined with the related formula for “m” method given in 《Code for Pile Foundation of Harbour Engineering》, a more accurate value of m can be obtained conveniently. Because this method is simple and practical, it can provide a useful reference for the project designer to determine a reasonable value of m.

Stress Analysis about Flat Ratio and Surrounding Rock of Large Section Highway Tunnel

2013 ◽  
Vol 368-370 ◽  
pp. 1404-1409 ◽  
Author(s):  
Yan Peng Zhu ◽  
Xiao Rui Song
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Axial Force ◽  
Layer Structure ◽  
Bending Moment ◽  
Surrounding Rock ◽  
Structure Model ◽  
Large Section ◽  
Finite Element Software ◽  
Highway Tunnel

By utilizing finite element software MIDAS-GTS, layer structure model is established and the force situation of large section tunnel under the combination of three sets of surrounding rock and three sets of flat ratio is analyzed. Through comparing axial force of anchor, axial force and bending moment of shotcrete and displacement of the lining, the optimal flat ratio is selected. Results can provide reference for the design of the large section highway tunnel.

Measuring the Deflection of a Circular Plate on an Elastic Foundation and Comparison with Analytical and FE Approaches

2014 ◽  
Vol 684 ◽  
pp. 407-412 ◽  
Author(s):  
Richard Klučka ◽  
Karel Frydrýšek ◽  
Miroslav Mahdal
Keyword(s):  
Analytical Solution ◽  
Circular Plate ◽  
Elastic Foundation ◽  
Analytical Solutions ◽  
Laboratory Testing ◽  
Bending Moment ◽  
Winkler Foundation ◽  
Measurement Apparatus ◽  
Plate Measurement

The solution of the interaction between a structure and its foundation is an important problem in mechanics and technical applications. This paper presents a solution of a circular plate rested on an elastic (Winkler) foundation. A jig was created for the purpose of loading a circular plate with a specific bending moment and force on the plate circumference. Laboratory testing was performed to determine the deflection in the centre and at the edge of the plate. Measurement apparatus was assembled and measurements were carried out; the results of the measurement were compared with the analytical solutions and FEM results. On the basis of these comparisons, the foundation modulus was determined. The experiment, analytical solution and FEM give similar results, thus providing a solid basis for technical applications.

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