Bearing Capacity of Fastener Steel Tube Full Hall Formwork Support Base on Stability of Pressed Pole with Multiple Point Restraint against Rotation

2012 ◽  
Vol 166-169 ◽  
pp. 1404-1415
Author(s):  
Zheng Ran Lu ◽  
Xiao Min Sui ◽  
Zhi Hua Chen
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Horizontal Tube ◽  
Steel Tube ◽  
Future Research ◽  
Multiple Point ◽  
Simplified Models ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Stability

Through advanced non-linear finite element models in different geometric parameters that considering the semi-rigid character of the couplers, the critical loads and failure modes of many fastener steel tube full hall formwork supports (FFS) with and without bridging were evaluated. Thirteen FFS specimens were tested to failure in order to examine the stability behavior and failure modes of them. The finite element analysis (FEA) results were well consistent with those of the test what could prove its validity. On the basis of FEA and experimental research, simplified models and corresponding calculation formulas were established for the FFS under uniform load through choosing different buckling modes, which were verified by the experimental and analytical results and turned out to be accurate enough in predicting the strength. The simplified models presented here considering the semi-rigid character of right-angle coupler, effect of adjacent horizontal tube which provided a very useful reference for the industry as well as academia for design and future research.

Fatigue Strength Study on Radial Bogie Vice Frame Based on Finite Element Analysis

2015 ◽  
Vol 723 ◽  
pp. 96-99
Author(s):  
Xiao Wei Wang ◽  
Mao Xiang Lang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Structural Strength ◽  
Simulation Software ◽  
Experimental Result ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Stability

The vice frame bears and transfers the forces and loads between the bogie and the vehicle body.The strength of the vice frame relates directly to the stability and smoothness of the vehicle. In this study, finite element analysis is utilized first to analyse the structural strength and fatigue life of the vice frame, and the recognize the weak parts of its structure in order to enhance its structural strength in the following design work.The finite element analysis is performed on a simulation software Ansys. Then an experiment is designed to test the fatigue strength of the vice frame. The experimental result indicates that the fatigue strength of the object corresponds to the standards and the finite element analysis has high feasibility in solving this kind of problem.

Finite Element Analysis of Creep Induced Volume Shrinkage of Salt Caverns

2013 ◽  
Vol 353-356 ◽  
pp. 1379-1385
Author(s):  
Ming Zhang ◽  
Shao Xin Zhang ◽  
Qiang Yang
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Volume Shrinkage ◽  
Salt Rock ◽  
Simplified Models ◽  
Element Analysis ◽  
Element Simulation ◽  
Storage Volume ◽  
The Stability ◽  
Salt Caverns

Salt rock is now being used widely as storage vault of oil and gas. However, the rheological properties of salt rock have significant influence on the stability of salt caverns and, in particular, induce the reduction of storage volumes. Therefore, the classical Nishihara model is used to describe the rheology of salt rock and incorporated into the finite element simulation firstly. Then the volume shrinkage is calculated for two typical simplified models with single cavern and double caverns. The results show that the storage volume of salt cavern decreases with the internal pressure and increases with service time for either single-cavern model or double-cavern model, which remains unchanged though the volume shrinkage of one cavern is influenced by others.

Finite Element Analysis of Mechanical Property for Solid Multibarrel Tube-Confined Concrete Columns (CHS Inner and SHS Outer) under Monotonic Loading

2011 ◽  
Vol 94-96 ◽  
pp. 641-646
Author(s):  
Zhao Qiang Zhang ◽  
Yong Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Failure Modes ◽  
Constitutive Models ◽  
Concrete Columns ◽  
Steel Tube ◽  
Monotonic Loading ◽  
Confined Concrete ◽  
Element Analysis ◽  
Load Displacement

Based on the constitutive models of steel and core concrete,the failure modes and the load-displacement curves of the solid multibarrel tube-confined concrete columns(CHS inner and SHS outer) under monotonic loading are calculated by using finite element analysis (FEA) method.The analytical results reveal the rules of stress distribution in steel and core concrete.The influences of axial compression ratio, yield strength of steel tube and concrete on the load-displacement curves are discussed.Through the results,it is deeply known the working mechanism of members(CHS inner and SHS outer) subjected to the static loads.

Probing the Instability of a Cluster of Slip Bonds Upon Cyclic Loads With a Coupled Finite Element Analysis and Monte Carlo Method

2014 ◽  
Vol 81 (11) ◽  
Author(s):  
Xiaofeng Chen ◽  
Bin Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Failure Modes ◽  
Underlying Mechanism ◽  
Cyclic Stretch ◽  
Cyclic Loads ◽  
Element Analysis ◽  
The Stability

Cells are subjected to cyclic loads under physiological conditions, which regulate cellular structures and functions. Recently, it was demonstrated that cells on substrates reoriented nearly perpendicular to the stretch direction in response to uni-axial cyclic stretches. Though various theories were proposed to explain this observation, the underlying mechanism, especially at the molecular level, is still elusive. To provide insights into this intriguing observation, we employ a coupled finite element analysis (FEA) and Monte Carlo method to investigate the stability of a cluster of slip bonds upon cyclic loads. Our simulation results indicate that the cluster can become unstable upon cyclic loads and there exist two characteristic failure modes: gradual sliding with a relatively long lifetime versus catastrophic failure with a relatively short lifetime. We also find that the lifetime of the bond cluster, in many cases, decreases with increasing stretch amplitude and also decreases with increasing cyclic frequency, which appears to saturate at high cyclic frequencies. These results are consistent with the experimental reports. This work suggests the possible role of slip bonds in cellular reorientation upon cyclic stretch.

K-Type, Inverse K-Type and X-Type Legs Stability Analysis of Jack-Up Offshore Platform

2013 ◽  
Vol 312 ◽  
pp. 205-209
Author(s):  
Wen Xian Tang ◽  
Jun Cao ◽  
Jian Zhang ◽  
Chao Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Offshore Platform ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Design Requirements ◽  
The Stability ◽  
Jack Up ◽  
Survival Condition

The force situation of truss legs has an important impact on the jack-up offshore platform. The finite element analysis on three types truss leg was made, and the stability of the three types truss leg under preload, operating and storm survival condition was discussed. The result showed that the maximum stress was in the chord; they met the design requirements; K type, inverse K type can save material, and they both met resonance requirements. The former had a better stability under preload condition, and the later had the best stability under operating, storm survival condition.

Design and Fabrication of Composite Wind Blades for a 5kW Wind Power System

2012 ◽  
Author(s):  
T. Y. Kam
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Element Model ◽  
Element Analysis ◽  
Fabric Composites ◽  
The Finite Element Analysis ◽  
Wind Power System ◽  
Twisting Angle ◽  
Composite Shear ◽  
Composite Skins

The development of composite wind blades for a 5kW wind turbine blade is presented. During the design process, the distributions of the twisting angle and wind load along the long axis of the blade are determined in the aerodynamic analysis of the blade. A finite element model is constructed for the design and stress analysis of the wind blade made of glass-fabric composites. The failure modes such as the first-ply failure and buckling of the skin of the composite wind blade are identified in the finite element analysis of the blade. The wind blade parts were fabricated using the hand-layup and vacuum-bag molding technique. The blade was composed of two, namely, upper and lower, composite skins which were joined together via a composite shear web. The wind blade was tested to validate the suitability of the design.

Experimental Research and Finite Element Analysis of Concrete-Filled Steel Box Columns with Longitudinal Stiffeners

2011 ◽  
Vol 287-290 ◽  
pp. 1037-1042 ◽  
Author(s):  
Jun Guang Zhang ◽  
Yong Jian Liu ◽  
Jian Yang ◽  
Kai Lei Xu
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Local Buckling ◽  
Steel Tube ◽  
Steel Plates ◽  
Thin Wall ◽  
Test Results ◽  
Element Analysis ◽  
Longitudinal Stiffeners ◽  
Box Columns

For further study of mechanical properties of concrete-filled steel box columns (CFSBCs) with longitudinal stiffeners, axially loading tests of CFSBCs with longitudinal stiffeners was conducted to obtain their ultimate bearing capacity and failure modes. The test results were compared with those of hollow steel box columns with longitudinal stiffeners. Cross section of the test specimen was scaled from a chord member of Dongjiang Bridge. The experimental results show that failure mode of CFSBCs with longitudinal stiffeners is local buckling of steel plates, which is different from that of concrete-filled thin wall steel tube columns with longitudinal stiffeners. Although longitudinal stiffeners can prevent global buckling of steel plates, the effect is less obvious than that of concrete-filled thin wall steel tube columns. Meanwhile, three-dimensional finite element models (FEM) of the specimens were modeled using computer program ANSYS to obtain bearing capacities and load-strain curves. The FEM results coincide quite well with the test results. Further, influence of width to thickness ratio on mechanical behavior of CFSBCs was analyzed using FEM.

Finite Element Thrust Line Analysis (FETLA) of Axisymmetric Masonry Dome with Meridian Cracks

2017 ◽  
Vol 865 ◽  
pp. 397-402 ◽  
Author(s):  
Mahesh Varma ◽  
Siddhartha Ghosh ◽  
Gabriele Milani
Keyword(s):  
Finite Element ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Tensile Forces ◽  
Ring Mechanism ◽  
Masonry Domes ◽  
Tension Cracks ◽  
The Stability ◽  
Masonry Dome ◽  
Line Analysis

Many masonry domes in their lower portion are subjected to hoop tensile forces which mostly lead to vertical cracks appearing along the dome's meridian planes. A close inspection of any such dome reveals these hoop tension cracks. The dome stands as a series of arches with common key stone, with cracks as a matter of non-structural consequences. Different strategies have been considered historically to arrest these cracks. The provision of tension ring mechanism adds to the stability of these domes, and hence many masonry domes are retrofitted with the provision of the tension rings using steel and FRP rings. The challenge in such retrofitting will remain to analyze its effect on stability of these masonry domes, more specifically in absence of reliable mechanical properties of such masonry domes. This paper presents a simplified analysis procedure combining thrust line analysis with the finite element analysis called here as Finite Element Thrust Line Analysis (FETLA). The development of a new element suitable for masonry dome analysis to include the effect of hoop tension cracks is demonstrated. The orthotropic material properties are utilized for penalty approach to allow redistribution of the forces from meridian direction to the hooping rings, with thrust line approaching the extrados or intrados of the dome. The analysis results of FETLA are validated with the previously available results. The analysis method proposed in this paper gives the rational estimates for the failure load without utilizing inelastic properties of the material to model the hoop tension cracks and its propagation.

scholarly journals Structural Behavior of Thin-Walled Concrete-Filled Steel Tube Used in Cable Tunnel: An Experimental and Numerical Investigation

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Hetao Hou ◽  
Su Ma ◽  
Bing Qu ◽  
Yanhong Liang ◽  
Yanjun Jin ◽  
...  
Keyword(s):  
Steel Tube ◽  
Fe Model ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Thin Walled ◽  
The Stability ◽  
Short Time ◽  
Concrete Filled Steel Tubes ◽  
Compression Resistance ◽  
Rock And Soil

One steel grid and five thin-walled concrete-filled steel tubes (CTST) used as the supports of tunnel were tested in site for investigating the mechanical behavior. The mechanical influences of thickness, node form, and concrete on CTST were gained and compared with the impacts on steel grid. It is indicated that high antideformation capacity of CTST improved the stability of surrounding rock in short time. The cementitious grouted sleeve connection exhibited superior flexibility when CTST was erected and built. Although the deformation of rock and soil in the tunnel was increasing, good compression resistance was observed by CTST with the new connection type. It was also seen that vault, tube foot, and connections were with larger absolute strain values. The finite element analysis (FEA) was carried out using ABAQUS program. The results were validated by comparison with experimental results. The FE model could be referred by similar projects.

Finite Element Simulation Analysis of Multi-Stands Three-Roller Cold Rolling Process for Double Metal Composite Seamless Steel Tube

2013 ◽  
Vol 470 ◽  
pp. 197-204 ◽  
Author(s):  
Xian Kang Wang ◽  
Jin Duo Ye ◽  
Xu Ma ◽  
Qian Qian Tian ◽  
Xue Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Cold Rolling ◽  
Rolling Process ◽  
Steel Tube ◽  
Metal Composite ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Seamless Steel Tube ◽  
Seamless Steel

The numerical simulation of the Y-type three-roller two stands cold rolling stainless steel/carbon steel double metal composite seamless steel tube process was conducted through the finite element analysis of the elastic-plastic by applying the MSC.MARC software. Based on the numerical simulation, the character of stress and strain distribution parameters during the Y-type three-roller two stands cold rolling were obtained by the finite element analysis, and acquired the section pass deformation figure. The distribution of the axial stress, circle stress and radial stress were drawn below the Y-type mill along the circle. The mechanism of the tube cold rolling process and the effect of the forming steel tube both the diameter and wall thickness accuracy were explained according to the stress distribution. The results of the research can be applied to the design of the technical parameters in the forming process.

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