Model Test on Joint Segment of Steel Truss and Composite Truss

2010 ◽  
Vol 163-167 ◽  
pp. 2027-2032
Author(s):  
Dong Yan Xue ◽  
Yu Qing Liu ◽  
Qian Wang ◽  
Biao Ma
Keyword(s):  
Model Test ◽  
Maximum Stress ◽  
Elastic State ◽  
Element Analysis ◽  
Linear Elastic ◽  
Steel Truss ◽  
Force Transformation ◽  
Numerical Finite Element ◽  
Truss Bridge ◽  
Good Agreement

The main span is the steel truss and the side spans are the composite truss in Minpu Bridge. A 1:2.5 model is made to study the mechanical behavior of the joint segment of steel truss and composite truss. Both a model test and a numerical finite element analysis(FEA) method have been conducted. The results show that the joint segment remains in a linear elastic state under the condition. The maximum stress in the structure is less than the material allowable strength. The FEA results are in very good agreement with those of model test. This study shows that the force transformation of the joint segment is reliable and the composition details are rational. It is also expected that the results presented in this paper would be useful as references for the further research and the design of composite truss bridge and joint segment.

scholarly journals The Investigation of Crack's Parameters on the V-Notch Using Photoelasticity Method

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
M. Saravani ◽  
M. Azizi
Keyword(s):  
Edge Crack ◽  
Opening Angle ◽  
Mode I ◽  
Single Edge ◽  
Element Analysis ◽  
Photoelasticity Method ◽  
Crack Behavior ◽  
Numerical Finite Element ◽  
Tip Radius ◽  
Good Agreement

V-notches are the most possible case for initiation of cracks in engineering structure. Cracks on the notch tip can be characterized by opening angle, tip radius, and depth of the V-notch. In this study, the effects of V-notch's opening angle on stress intensity factor and on -stress of the crack have been investigated in detail. Our calculation has been performed in a number of opening angles and various crack lengths in mode I loading using photoelasticity method. We show that as opening angle grows at constant crack's length, SIF and -stress decrease. Furthermore, as the crack's length increases, the V-notch effect diminishes and the crack behavior can be considered as a single-edge crack specimen. Finally, the obtained results were found to be in good agreement with outcome of numerical finite element analysis.

scholarly journals Finite Element Analysis and Experimental Study of Metal Shell of GIL

2021 ◽  
Vol 252 ◽  
pp. 02042
Author(s):  
Gong Mimi ◽  
Zhao Yantao ◽  
Fu Jiajia ◽  
Luo Changlu ◽  
Sun Mingdao ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Finite Element ◽  
Maximum Stress ◽  
Water Pressure ◽  
Environmental Safety ◽  
Metal Shell ◽  
Element Analysis ◽  
Safety Requirements ◽  
Finite Element Numerical Simulation ◽  
Good Agreement

Mathematical modeling, finite element numerical simulation and experimental measurement of the stress-deformation distribution of the gas-insulated metal-enclosed transmission line shell were carried out. Also, Stress linearization analysis was used to analyze the maximum stress. The results show that the stress is linearly dependent on water pressure and the shell occurs elastic deformation without plastic deformation. The simulated maximum stress of 76.2MPa is fairly in good agreement with the measured one (69.9MPa). The stress linearization analysis results show that the shell well satisfies the environmental safety requirements. The experimental results are consistent with the finite element results.

A Simple Calculation Method of Assembled Type Steel Truss Bridge's Deflection

2013 ◽  
Vol 340 ◽  
pp. 31-36
Author(s):  
Zheng Jun Wang ◽  
Lei Gao ◽  
Xiao Hui He ◽  
Hong Bing Liu
Keyword(s):  
Simple Calculation ◽  
Maximum Deflection ◽  
Element Analysis ◽  
Space Problem ◽  
Type Steel ◽  
Calculating Method ◽  
Steel Truss Bridge ◽  
Steel Truss ◽  
The Common ◽  
Truss Bridge

In this paper, it is proposed that the simplified calculating method of equivalent beam of assembled type steel truss bridge's deflection. The use of finite element analysis software, the common span bridge's deflection is calculated. It is provided that the maximum deflection of assembled type steel truss bridge is approximately proportional to the span's cube through numerical analysis, and it has a linear relationship with the maximum deflection of equivalent beam. The space equivalent coefficient is introduced; the space problem is converted into a plane problem. The relational expression between assembled type steel truss bridge and equivalent beam has a fitting while to be strengthened or not strengthened. Therefore, it is provided a simple and feasible method for similar assembled type steel truss bridge's deflection calculation.

A Robust Method for Inelastic Analysis of Components Made of Anisotropic Material

1999 ◽  
Vol 121 (2) ◽  
pp. 154-159 ◽  
Author(s):  
S. Babu ◽  
P. K. Iyer
Keyword(s):  
Finite Element ◽  
Anisotropic Material ◽  
Robust Method ◽  
Element Analysis ◽  
Linear Elastic ◽  
Inelastic Analysis ◽  
Anisotropic Bodies ◽  
Inelastic Strains ◽  
Adjustment Scheme ◽  
Good Agreement

A new robust method, called MARS (modulus adjustment and redistribution of stress), based on linear elastic finite element analyses has been proposed to evaluate inelastic strains in anisotropic bodies. The linearity of relaxation locus forms the basis of the method. A combination of modulus adjustment scheme and iterative strategy used in the MARS method satisfies the equilibrium and yield conditions, which in turn brings the static and kinematic distributions close to the actual distributions for a given load. Several notched bodies made of anisotropic material are analyzed using the MARS method and the inelastic strains evaluated are found to be in good agreement with those predicted using elastic-plastic finite element analysis.

scholarly journals Seismic Retrofit of Steel Truss Bridge Using Buckling Restrained Damper

2019 ◽  
Vol 9 (14) ◽  
pp. 2791 ◽  
Author(s):  
Purevdorj Sosorburam ◽  
Eiki Yamaguchi
Keyword(s):  
Seismic Behavior ◽  
Seismic Load ◽  
Design Codes ◽  
Element Analysis ◽  
Cross Sectional ◽  
Steel Truss Bridge ◽  
Dynamic Finite Element Analysis ◽  
Steel Truss ◽  
The Individual ◽  
Truss Bridge

Buckling Restrained Bracings (BRBs) are widely used to improve the seismic behavior of buildings. They are employed for bridges as well, but their application in this respect is limited. BRBs can also be used as a function of the individual damper rather than the structural component or the bracing, in which case the device may be called a Buckling Restrained Damper (BRD). Yet, such application has not been explored much. There are quite a few bridges designed according to the old design codes in Japan. Their seismic resistance may not be satisfactory for the current seismic design codes. Against this background, the behavior of a steel truss bridge under a large seismic load was investigated by nonlinear dynamic finite element analysis. Some members were indeed found to be damaged in the earthquake. Retrofitting is needed. To this end, the application of BRD was tried in the present study: a parametric study on the seismic behavior of the truss bridge with BRD was conducted by changing the length, the cross-sectional area, the location and the inclination of BRD. The effectiveness of BRD was then discussed based on the numerical results thus obtained. In all the analyses, ABAQUS was used.

Robust Approximate Methods for Estimating Inelastic Fracture Parameters

1995 ◽  
Vol 117 (2) ◽  
pp. 115-123 ◽  
Author(s):  
R. Seshadri ◽  
R. K. Kizhatil
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Creep Crack Growth ◽  
Growth Parameter ◽  
Local Stress ◽  
Robust Methods ◽  
Approximate Methods ◽  
Element Analysis ◽  
Linear Elastic ◽  
Good Agreement

Robust approximate methods to estimate the inelastic energy release rate J, and the creep crack-growth parameter, C*, for cracked components are described in this paper. These methods use linear elastic finite element analysis in conjunction with the concepts of the generalized local stress strain (GLOSS) analysis and redistribution nodes (r-nodes), and are readily applicable to complex geometries and loadings. J-estimates obtained by the use of robust methods are found to be in good agreement with the results of elastic-plastic finite element analysis.

Reinforcing Analysis for the Lower Chord of Steel Truss Bridge Based on Thermosetting Resin Matrix Composite

2012 ◽  
Vol 531 ◽  
pp. 589-592
Author(s):  
Jia Guo Zheng ◽  
Yun Shu Zhao ◽  
Yue Ping Zhao ◽  
Qi Jun Chen
Keyword(s):  
Composite Laminates ◽  
Resin Composite ◽  
Steel Structure ◽  
Resin Matrix ◽  
Thermosetting Resin ◽  
Interlaminar Stresses ◽  
Element Analysis ◽  
Steel Truss Bridge ◽  
Steel Truss ◽  
Truss Bridge

Thermosetting resin composite material has been widely used in strengthening the concrete members. However, there are only a few applications in strengthening steel structure. Based on the finite element analysis software ANSYS in this article, mechanical analysis are carried out for the lower chord before and after reinforcement of the long-span steel truss bridge and comparison are made. Interlaminar stresses in X, Y, Z three directions of the composite laminates are extracted. Compared with the results, the conclusion that application of composite materials for reinforcement of the lower chord can change the stress of the lower chord and improve the quality of the steel trussed bridge is drawn out.

scholarly journals Experimental and numerical evaluation of the axial capacity of cracked tubular members

2021 ◽  
Vol 1201 (1) ◽  
pp. 012053
Author(s):  
S Riise ◽  
M R Vågen ◽  
M Atteya ◽  
G Ersdal
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Tests ◽  
Element Analysis ◽  
Axial Capacity ◽  
Steel Members ◽  
Safe Side ◽  
Crack Tips ◽  
Numerical Finite Element ◽  
Good Agreement

Abstract This paper presents the experimental and numerical results for the axial capacity of cracked tubular steel members. Experimental tests of 11 columns in compression with simulated cracks of different sizes, defined as the percentage of the circumference (12%, 23.5% and 38.5%). The crack-tips were further treated by drilling a crack arresting hole. These specimens were then modelled by finite element analysis which were verified to match the experimental test. The DNVGL-RP-C208 standard was used as basis for performing the numerical finite element analysis. In addition, the capacity of the columns was calculated according to the 2004 revision of the NORSOK N-004 standard. The experimental tests indicated that the capacity in compression did not change significantly with the presence of cracks and crack arresting holes. The results from the numerical finite element analysis show a good agreement with the experimental work. However, the compressive capacity according to NORSOK N-004 shows a significant deviation to the safe side.

Fracture of Metal-Polymer Interfaces with Fine-Line Geometries

1989 ◽  
Vol 167 ◽  
Author(s):  
Shih-Liang Chiu ◽  
Y. H. Jeng ◽  
Raul E. Acosta ◽  
Paul Ho
Keyword(s):  
Film Thickness ◽  
Fracture Behavior ◽  
Dominant Mode ◽  
Line Orientation ◽  
Polymer Interfaces ◽  
Element Analysis ◽  
Linear Elastic ◽  
Formation Of Cracks ◽  
Metal Polymer ◽  
Good Agreement

AbstractThe fracture behavior of metal-polymer line structures as a function of dimensions was investigated using a stretch-deformation technique. The effects of line orientation, line width and film thickness are reported in this paper. When the line orientation is parallel to the stretching direction, only formation of cracks normal to the lines is observed. However, when the line is perpendicular to the stretching direction, delamination becomes the dominant mode of fracture. Wide lines (16μm) exhibit larger shear stress at the edge of the metal-polymer interface, thus delaminate earlier than narrow lines (4μm). By decreasing the metal film thickness, the depth of stress penetration at the interface decreases, making the propagation of cracks more difficult in thin films than in thick films.Finite element analysis was carried out to account for the experimental observations and good agreement was obtained. In the analysis, the plastic deformation characteristics of the metal and the polymer have been specifically taken into account. In comparison with a linear elastic analysis, the linear model predicts significantly higher stress levels and local concentrations than the nonlinear model.

Stress Analysis of Elliptical Tube Plates in Heat Exchangers

1987 ◽  
Vol 109 (3) ◽  
pp. 310-314 ◽  
Author(s):  
Zhi-Fu Sang ◽  
G. E. O. Widera
Keyword(s):  
Heat Exchangers ◽  
Maximum Stress ◽  
Waste Heat ◽  
Theoretical Calculations ◽  
Two Dimensional ◽  
Element Analysis ◽  
Test Models ◽  
Dimensional Finite Element ◽  
High Temperature High Pressure ◽  
Good Agreement

Elliptical tube plates are used widely in high temperature, high pressure heat exchangers and waste heat boilers. This paper presents a detailed analysis of the stress distribution in elliptical tube plates subjected to internal pressure and discusses the location of the maximum stress. Two test models were used to gather data. Calculations were based on two-dimensional finite element analysis. The experiments used strain gage measurements. The results of the analysis of the two models show that the theoretical calculations and the experimental data are in good agreement, and that the location of the maximum stress is not at the crown of the elliptical tube plates. The latter result differs from the previously published conclusions of Rachkov and Morozov [1].

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