Structure-Soil Interaction of Buried Corrugated Steel Arch Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 2112-2117
Author(s):  
Miao Xin Zhang ◽  
Bao Dong Liu ◽  
Peng Fei Li ◽  
Zhi Mao Feng
Keyword(s):  
Finite Element ◽  
Steel Structures ◽  
Internal Force ◽  
Structural Deformation ◽  
Fe Model ◽  
Soil Pressure ◽  
Load Range ◽  
Finite Element Program ◽  
Load Conditions ◽  
Peak Value

Corrugated steel plate and surrounding soils are working together to share the load in buried corrugated steel structures. It is complicated to consider the structure-soil interaction, so the finite element method has already become the chief means of complicated structure analysis. Based on a practical project, considering structure-soil interaction, by using the finite element program of ANSYS, the paper set up a 2-D FE model and analyzed the soil pressure, the structural deformation and the internal force under different load conditions in detail. The analysis shows that structure-soil interaction has brought about stresses redistribution of surrounding soils, and adverse effects of soil pressure and displacement were limited. The variation range of soil pressure on the crown of arch increases with the load increases and the peak value of soil pressure approach to the code value and a rebound appears in the vehicle load range. The tendencies of vertical soil displacement are nearly the same to different load conditions, and the peak value of moments has an obvious change and can be influenced greatly by deflective load.

Bayesian Probabilistic Approach to FE Model Updating of Vehicle Typical Spot Weld Structure

2013 ◽  
Vol 690-693 ◽  
pp. 2601-2607
Author(s):  
Chun Zhu Yao ◽  
Hong Yan Wang ◽  
Qiang Rui
Keyword(s):  
Finite Element ◽  
Model Updating ◽  
Structural Parameters ◽  
Probabilistic Approach ◽  
Spot Weld ◽  
Statistical Characteristics ◽  
Fe Model ◽  
Finite Element Program ◽  
Distribution Ranges ◽  
Weld Structure

Finite element (FE) modeling of laser welds for dynamic analysis is a research issue because of the complexity and uncertainty of the welds and thus formed structures. A Bayesian probabilistic framework incorporating MCMC for updating the parameters of a spot weld structure model was presented, cooperation of finite element program and multiple chains sampling technology was realized, and statistical characteristics of structural parameters were obtained. Distribution ranges of the three frequencies were predicted based on parameter estimation. Numerical simulation indicates that there are little changes in standard deviations of posterior distribution compared to prior distribution, the posterior mean values are in good agreement with the corresponding measured average values. The convergence indicates the techniques feasibility and effectiveness. The present work offers an alternative approach to updating the spot weld structure parameters.

Finite Element-Based Parametric Investigations of the Stepped-Lap Repairs to Laminated Cylindrical Shell

2011 ◽  
Vol 90-93 ◽  
pp. 2682-2690
Author(s):  
Jian Xin Xu ◽  
Lu Chun Zhao ◽  
Ding He Li
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Cylindrical Shells ◽  
Fe Model ◽  
Stacking Sequence ◽  
Improve Design ◽  
Analysis Techniques ◽  
Insight Into ◽  
Laminated Cylindrical Shell ◽  
Load Conditions

A parametric finite element (FE) model was developed to allow a broad investigation into the influence of various parameters, such as load conditions, stacking sequence and the number of steps on the performance of the stepped-lap repairs in composite laminated cylindrical shells. And the peak stresses determined with respect to changes in stacking sequence and the number of steps. Furthermore, the adhesive stress distribution resulting from joining mismatched laminate cylindrical shells was investigated. The results of this investigation provide further insight into the stresses that develop in stepped repairs of composite structures under load. This insight may lead to improve design and analysis techniques of stepped repairs in composite structures.

scholarly journals Numerical Modeling of GFRP Reinforced Concrete Slabs

2017 ◽  
Vol 1 (4) ◽  
Author(s):  
Omer R EL Zaroug, John P Forth, Jianqiao YE
Keyword(s):  
Finite Element ◽  
Mechanical Load ◽  
Weight Ratio ◽  
High Strength ◽  
Load Range ◽  
Finite Element Program ◽  
Reinforced Concrete Slabs ◽  
Reinforced Polymer ◽  
Element Program ◽  
Fibre Reinforced Polymer

The use of non-metallic fibre reinforced polymer reinforcement as an alternative to steel reinforcement in concrete is gaining acceptance mainly due to its high corrosion resistance. High strength-to-weight ratio, high stiffness-to-weight ratio and ease of handling and fabrication are added advantages. Other benefits are that they do not influence to magnetic fields and radio frequencies and they are thermally non-conductive. However, the stress-strain relationship for Glass fibre reinforced polymer reinforcement (GFRP) is linear up to rupture when the ultimate strength is reached. Unlike steel reinforcing bars, GFRP rebars do not undergo yield deformation or strain hardening before rupture. Also, GFRP reinforcement possesses a relatively low elastic modulus of elasticity compared with that of steel. As a consequence, for GFRP reinforced sections, larger deflections and crack widths are expected than the ones obtained from equivalent steel reinforced sections for the same load. This investigation provides details of the numerical analysis of GFRP reinforced slabs loaded mechanically using the commercial finite element program (DIANA). To prove the validity of the proposed finite element approach, a comparison is made with experimental test results obtained from full-size slabs. The comparisons are made on the basis of first cracking load, load-deflection response at midspan, cracking patterns, mode of failure and loads at failure. Using the DIANA software for the analysis of GFRP reinforced slabs under mechanical load is possible and can produce acceptable predictions throughout the load range in terms of final load and crack patterns. However, DIANA overestimated the first cracking load and tended to over predict the experimental deflections.  

scholarly journals Study on Impact Parameters of Rigidity and Flexibility for Buried Corrugated Steel Culvert

2014 ◽  
Vol 8 (1) ◽  
pp. 14-22 ◽  
Author(s):  
Baodong Liu ◽  
Zongmin Liu ◽  
Miaoxin Zhang ◽  
Quanlu Wang
Keyword(s):  
Finite Element ◽  
Internal Friction ◽  
Deformation Modulus ◽  
Earth Pressure ◽  
Steel Structures ◽  
Friction Angle ◽  
Internal Friction Angle ◽  
Steel Pipe ◽  
Inertia Moment ◽  
Finite Element Program

Buried corrugated steel culverts are universally regarded as a structure with strong deformation adaptability and dispersed the upper load by corrugated steel structures surrounding soil constraints to enhance the carrying capacity and the use of soil-structure interaction. A lot of factors influence the earth pressure of the buried corrugated steel culvert, such as culvert stiffness, physical characteristics of the backfill (bulk density, deformation modulus and internal friction angle), geometry of structure and backfilling height. The finite element program of ANSYS has been used to research the elastic modulus, Poisson’s ratio, internal friction angle of soil, inertia moment of corrugated steel plate and pipe diameter affect the rigidity and flexibility of buried corrugated steel culvert. By defining path lines in the finite element post-processing, extracting and comparing the horizontal and vertical directions soil displacements along the lines, and doing impact pa-rameter analysis. Classification for flexible and rigid pipes of the buried corrugated steel pipe culvert structure has been made according to the analysis results. A theoretical reference has been provided for the design and construction of the buried corrugated steel pipe culverts.

Structural Design and Analysis of Aluminum Dome for Caofeidian Coal Storage

2016 ◽  
Vol 710 ◽  
pp. 396-401 ◽  
Author(s):  
Ze Chao Zhang ◽  
Hong Bo Liu ◽  
Xiao Dun Wang ◽  
Xiang Yu Yan ◽  
Jing Hai Yu ◽  
...  
Keyword(s):  
Finite Element ◽  
Aluminum Alloys ◽  
Three Dimensional ◽  
Single Layer ◽  
Element Model ◽  
Internal Force ◽  
Structural Deformation ◽  
Mode Analysis ◽  
Finite Element Software ◽  
The Stability

The upper part of Caofeidian coal storage was approximately hemispherical aluminum shell, covered with aluminum alloys plate. The capsule was made of aluminum alloys material, and its span was 125 meters. In the design, according to TEMCOR joint, we used the finite element software MIDAS to build the accurate geometry models and calculation models of aluminum alloys single layer latticed dome structures. By the combination of constant loads, live loads, snow load, wind load, temperature effect and other working conditions, we summarized the consumption of aluminum of the structures, and studied the structural internal force, structural deformation and structural stiffness. In addition, the X and Y two different direction seismic dynamic load was applied to the structure. The structural seismic performance under two kinds of modes were studied through the structure mode analysis of the vibration frequency. The vierendeel dome and single layer dome were controlled by the stability. ANSYS three-dimensional frame element model were set up, and the eigenvalue buckling analysis was carried out. By the geometrical nonlinear finite element method, combining with initial imperfections and material nonlinear, we found out the stability coefficient and the weak parts of the structure.

Finite element analysis of tension-loaded ASTM A325 bolts under simulated fire loading

2018 ◽  
Vol 9 (1) ◽  
pp. 2-18
Author(s):  
Ali Shrih ◽  
Adeeb Rahman ◽  
Mustafa Mahamid
Keyword(s):  
Finite Element ◽  
Experimental Testing ◽  
Three Dimensional ◽  
Steel Structures ◽  
Fe Model ◽  
Repeated Testing ◽  
Element Analysis ◽  
Content Type ◽  
Fire Loading ◽  
Simulated Fire

Purpose Nuts and bolts have been used as fasteners of steel structures for many years. However, these structures remain susceptible to fire damage. While conducting fire experiments on steel structures is sometimes necessary, to better understand their behavior, such experiments remain costly and require specialized equipment and testing facilities. This paper aims to present a highly accurate three-dimensional (3D) finite element (FE) model of ASTM A325 bolt subjected to tension loading under simulated fire conditions. The FE model is compared to the results of experimental testing for verification purposes and is proven to predict the response of similar bolts up to certain temperatures without the need for repeated testing. Design/methodology/approach A parametric 3D FE model simulating tested specimens was constructed in the ANSYS Workbench environment. The model included the intricate details of the bolt and nut threads, as well as all the other components of the specimens. A pretension load, a tension force and a heat profile were applied to the model, and a nonlinear analysis was performed to simulate the experiments. Findings The results of the FE model were in good agreement with the experimental results, deviations of results between experimental and FE results were within acceptable range. This should allow studying the behavior of structural bolts without the need for expensive testing. Originality/value Detailed 3D FE models have been created by the authors have been created to study the behavior of structural bolts and compared with experiments conducted by the authors.

Structural Optimization of Reinforced Concrete Aqueduct with Multi-Longitudinal Beams Part II: Application

2011 ◽  
Vol 243-249 ◽  
pp. 323-326
Author(s):  
Jun Feng Guan ◽  
Xiao Ke Li ◽  
Shun Bo Zhao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Optimization Design ◽  
Design Method ◽  
Distribution Patterns ◽  
Internal Force ◽  
Structural Deformation ◽  
Structural Element ◽  
Dead Weight ◽  
Shell Finite Element

Based on a 3-D solid finite element parametric model, an optimization design method of reinforced concrete aqueduct with multi-longitudinal beams is proposed. In this method, the stress of sidewall and subplate is controlled by the sectional crack-resisting criteria, the space between longitudinal beams or crossbeams is decided by the coordination of structural deformation, and the bottom stress of longitudinal beams or crossbeams is restrained by the nominal tensile stress. Taking the lightest dead weight of aqueduct as the objective of optimization, this method is able to give the optimal sizes and distribution patterns of the main load bearing members. The internal force of each structural element of the optimized aqueduct is calculated by a 3-D beam-shell finite element numerical model and thus the reinforcements are arranged. Compared with the prototype, the optimized aqueduct shows the advantages of lighter weight, more reasonable stiffness distribution, coordinated deformation and economical reinforcements.

Tire Transient Analysis with an Explicit Finite Element Program

1997 ◽  
Vol 25 (4) ◽  
pp. 230-244 ◽  
Author(s):  
B. G. Kao ◽  
M. Muthukrishnan
Keyword(s):  
Finite Element ◽  
Strain Energy Function ◽  
Constitutive Law ◽  
Dynamic Responses ◽  
Fe Model ◽  
Fe Method ◽  
Design Data ◽  
Finite Element Program ◽  
Explicit Finite Element ◽  
Wheel Model

Abstract The Finite Element (FE) method has long been recognized as an effective analytical tool for tire design analysis. However, meaningful prediction of the tire dynamic characteristics, such as tire transient responses, was not feasible due to the limitations of the traditional commercial FE programs. The availability of the explicit FE programs has made such simulation one step closer to reality. In this paper LS-DYNA3D, an explicit FE program, is used to simulate a simple tire test, demonstrating that it is possible to predict the tire dynamic responses from the tire design data. Geometry, material properties of various components and the fiber reinforcement, layout, etc. of a commercial tire were used to create the tire FE model. Tire carcass composite properties were calculated from a strain energy function derived for the fiber-reinforced rubber. The Mooney constitutive law was adopted for the elastic properties of the rubbers. The tire model was coupled with a rigid wheel model and inflated to a specified inflation pressure. The tire-wheel model was then loaded against a rotating rigid cylinder with an attached semi-circular cleat. The calculated tire center reaction forces showed good correlation with laboratory measurements.

A CO-ROTATIONAL FORMULATION FOR GEOMETRICALLY NONLINEAR FINITE ELEMENT ANALYSIS OF SPATIAL BEAMS

1994 ◽  
Vol 18 (1) ◽  
pp. 65-88 ◽  
Author(s):  
L. Jiang ◽  
M.W. Chernuka
Keyword(s):  
Finite Element ◽  
Numerical Solutions ◽  
Three Dimensional ◽  
Internal Force ◽  
Beam Element ◽  
Geometrically Nonlinear ◽  
Element Analysis ◽  
Finite Element Program ◽  
Geometrically Nonlinear Analysis ◽  
Spatial Beams

A co-rotational procedure is presented in this paper for handling arbitrarily large three-dimensional rotations associated with geometrically nonlinear analysis of spatial beam structures. This procedure has been incorporated into two commonly used 3-D beam elements, the 2-node cubic beam element and the 3-node superparametric beam element, in our in-house general purpose finite element program, VAST. In the present procedure, the element tangent stiffness matrices are generated by using the standard updated Lagrangian formulation, while a co-rotational formulation is employed to update the internal force vectors during the Newton-Raphson iterations, A number of example problems have been analyzed and the result are in good agreement with analytical or published numerical solutions.

scholarly journals 2D Idealisation of Hollow Reinforced Concrete Beams Subjected to Combined Torsion, Bending and Shear

2005 ◽  
Vol 2 (1) ◽  
pp. 53 ◽  
Author(s):  
A.S. Al-Nuaimi ◽  
P. Bhatt
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Element Model ◽  
Experimental Results ◽  
Reinforced Concrete Beams ◽  
Fe Model ◽  
Two Dimensional ◽  
Cross Sectional ◽  
Finite Element Program ◽  
Hollow Beams

This paper presents a finite element model for idealisation of reinforced concrete hollow beams using 2D plane elements. The method of ensuring compatibility between the plates using two-dimensional model to analyze this type of structures is discussed. Cross-sectional distortion was minimised by incorporating end diaphragms in the FE model. Experimental results from eight reinforced concrete hollow beams are compared with the non-linear predictions produced by a 2D in-house FE program. The beam dimensions were 300x300 mm cross section with 200x200 mm hollow core and 3800 mm long. The beam ends were filled with concrete to form solid end diaphragms to prevent local distortion. The beams were subjected to combined bending, torsion and shear. It was found that the two-dimensional idealisation of hollow beams is adequate provided that compatibility of displacements between adjoining plates along the line of intersection is maintained and the cross-sectional distortion is reduced to minimum. The results from the 2D in-house finite element program showed a good agreement with experimental results. 

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