scholarly journals Strengthening of Steel Columns under Load: Torsional-Flexural Buckling

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Martin Vild ◽  
Miroslav Bajer
Keyword(s):  
Finite Element ◽  
Experimental Research ◽  
Local Buckling ◽  
Load Resistance ◽  
Finite Element Models ◽  
Ansys Software ◽  
Steel Columns ◽  
Flexural Buckling ◽  
Base Section ◽  
Numerical Research

The paper presents experimental and numerical research into the strengthening of steel columns under load using welded plates. So far, the experimental research in this field has been limited mostly to flexural buckling of columns and the preload had low effect on the column load resistance. This paper focuses on the local buckling and torsional-flexural buckling of columns. Three sets of three columns each were tested. Two sets corresponding to the base section (D) and strengthened section (E) were tested without preloading and were used for comparison. Columns from set (F) were first preloaded to the load corresponding to the half of the load resistance of the base section (D). Then the columns were strengthened and after they cooled, they were loaded to failure. The columns strengthened under load (F) had similar average resistance as the columns welded without preloading (E), meaning the preload affects even members susceptible to local buckling and torsional-flexural buckling only slightly. This is the same behaviour as of the tested columns from previous research into flexural buckling. The study includes results gained from finite element models of the problem created in ANSYS software. The results obtained from the experiments and numerical simulations were compared.

Finite Element Simulation Analysis on Space KX-Joint

2014 ◽  
Vol 915-916 ◽  
pp. 146-149
Author(s):  
Yong Sheng Wang ◽  
Li Hua Wu
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Simulation Analysis ◽  
Local Buckling ◽  
Element Model ◽  
Ansys Software ◽  
Element Simulation ◽  
Calculation Results ◽  
Buckling Failure ◽  
The Finite Element Model

The finite element model of the space KX-Joint was established using ANSYS software, and the failure mode and ultimate bearing capacity of KX-joint were researched. Calculation results show that the surface of chord wall on the roots of compression web members was into the plastic in K plane, and the holding pole without the plastic area and the local buckling failure happened in the surface of chord wall on the roots of Compression Web Members in X plane; The bearing capacity of the joint increased with the Chord diameter, which was appears in the form of power function.

scholarly journals Inherent possibilities and limitations of finite element modelling of defective girth welds

2010 ◽  
Vol 1 (1) ◽  
pp. 127-135
Author(s):  
Stijn Hertele ◽  
Wim De Waele ◽  
Rudi Denys ◽  
Matthias Verstraete
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Experimental Research ◽  
Finite Element Modelling ◽  
Experimental Validation ◽  
Stable Crack Growth ◽  
Worst Case ◽  
Element Modelling ◽  
Numerical Research ◽  
Girth Welds

Welds unavoidably show defects, which can negatively affect the integrity of the entire structureand, worst case, result in a failure. Defects of a considerable size should therefore be detected, assessedand, if necessary, repaired. The assessment of a defect requires a procedure which allows a conservativeestimation of the acceptability of the defect. To develop such procedure, both experimental and numericalresearch is performed. This paper describes the inherent possibilities and limitations of numerical researchthrough finite element modelling, as compared to experimental research. Summarizing all arguments, itbecomes clear that numerical research is a highly powerful tool, but a thorough experimental validation is ofparamount importance. Moreover, some specific weld-related problems are highly difficult to address,namely the presence of stable crack growth and material heterogeneity. More research is needed toachieve a description of these phenomena, under a set of conservative assumptions.

Effect of Column Base Flexibility on Earthquake-Induced Residual Deformations of Steel Columns

2018 ◽  
Vol 763 ◽  
pp. 149-156 ◽  
Author(s):  
Hiroyuki Inamasu ◽  
Dimitrios G. Lignos ◽  
Amit M. Kanvinde
Keyword(s):  
Finite Element ◽  
Local Buckling ◽  
Steel Columns ◽  
Steel Moment Resisting Frames ◽  
High Rise ◽  
Moment Resisting ◽  
Residual Deformations ◽  
Steel Mrfs ◽  
Column Base ◽  
Axial Shortening

Post-earthquake residual deformations often control decisions regarding potential demolition of earthquake-damaged buildings. While residual deformations are typically assumed to be lateral, the column residual axial shortening has similar implications for such decisions. This paper investigates the effect of column base flexibility on residual axial shortening of columns in steel moment resisting frames (MRFs). The mechanistic reason for this dependency is that higher base flexibility reduces plastic rotation demands in the column, in turn mitigating local buckling-induced shortening. To investigate this issue, parametric finite element (FE) simulations interrogate various column sizes used in conventional mid-to high-rise steel MRFs. The simulations suggest at 1-2% story drifts, the base flexibility virtually eliminates the column axial shortening.

Modal Analysis and Experimental Research of Marine Gearbox

2014 ◽  
Vol 607 ◽  
pp. 405-408 ◽  
Author(s):  
Wen Liu ◽  
Teng Jiao Lin ◽  
Quan Cheng Peng
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Experimental Research ◽  
Natural Frequencies ◽  
Element Model ◽  
Ansys Software ◽  
Tetrahedral Element ◽  
Spring Element ◽  
Good Agreement

The gear-shaft-bearing-housing coupled finite element model of marine gearbox was established by using the truss element, the spring element and the tetrahedral element. The modal of gearbox was analyzed by using the ANSYS software. Then through the experimental modal analysis, the natural frequencies of gearbox are obtained. Compare the experimental results with the numerical results, it shows good agreement.

Finite Element Analysis and Experimental Study on the Behavior of Widened Beam Flange Connections of Steel Frame under Cyclic Loading

2011 ◽  
Vol 243-249 ◽  
pp. 948-952
Author(s):  
Hui Mao ◽  
Yan Wang ◽  
Cheng Hua Li
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Finite Element Models ◽  
Ansys Software ◽  
Element Analysis ◽  
Side Plate ◽  
Skeleton Curve ◽  
Failure Patterns ◽  
Plate Connections ◽  
Good Agreement

Based on the experiments of four connections with widened beam flange section which included two arc widened beam flange connections and two welded side-plate connections specimens and one ordinary connection under cyclic loading, 3-D nonlinear finite element models were created by using ANSYS software to analyze the mechanical properties of these two types of widened beam flange connections, such as skeleton curve, ultimate load, ductility and failure mode etc. The analytical results show good agreement with those of the experiments and prove the finite models correct and applicable. According to the experimental and element analytical failure results, the PI(PEEQ Index) was introduced to investigate the plasticity development and fracture tendency at the end of the widened flange part . Furthermore, the failure patterns of widened beam flange connection were revealed.

Finite Element Analysis on the Local Buckling Behavior of High Strength Steel Members under Axial Compression

2011 ◽  
Vol 243-249 ◽  
pp. 1477-1482 ◽  
Author(s):  
Gang Shi ◽  
Cuo Cuo Lin ◽  
Yuan Qing Wang ◽  
Yong Jiu Shi ◽  
Zhao Liu
Keyword(s):  
Finite Element ◽  
Axial Compression ◽  
High Strength Steel ◽  
Local Buckling ◽  
High Strength ◽  
Finite Element Models ◽  
Loading Capacity ◽  
Element Analysis ◽  
Steel Members ◽  
Buckling Behavior

Compared to the ordinary strength steel extensively applied in structures currently, high strength steel, a new kind of construction material, has many differences on mechanical properties. Though high strength steel has been applied in several projects in the world, which has obtained good effects, there is a lack of the design method for high strength steel structures and researches on the loading capacity of high strength steel members. To study the local buckling behavior of high strength steel members under axial compression, finite element models are developed to predict the loading capacity of high strength steel welded I-section and box-section stub columns under axial compression in this paper. With accurate simulation of 17 high strength steel specimens, the finite element analysis results agree well with the corresponding test results, and the average deviation of the ultimate loading capacity of 17 specimens is about -3.1%. It’s verified that the finite element models developed in this paper can accurately simulate high strength steel members with the initial geometric imperfections and residual stresses, and analyze the local buckling behavior of high strength steel members under axial compression. In addition, it provides a basis for the parametric study of high strength steel members under axial compression in future.

Shimming effect on the mechanical behaviors of composite assembly structures of aircraft

2017 ◽  
Vol 233 (3) ◽  
pp. 851-860 ◽  
Author(s):  
Guoqiang Gao ◽  
Luling An ◽  
Wei Zhang ◽  
Ende Ge ◽  
Xuande Yue ◽  
...  
Keyword(s):  
Finite Element ◽  
Experimental Research ◽  
Failure Criteria ◽  
Nonlinear Finite Element ◽  
Finite Element Models ◽  
Mechanical Behaviors ◽  
Composite Matrix ◽  
Out Of Plane ◽  
Nonlinear Shear ◽  
Good Agreement

The mechanical behaviors of composite assembly structures of aircraft might change due to filling the fit-up gap between two components with liquid shim or laminated shim. In order to investigate the change qualitatively and quantitatively, a kind of implicit nonlinear finite element models are developed, and mixed failure criteria considering the nonlinear shear relationship between composite matrix and fiber, out-of-plane stresses, and buckling of fiber are incorporated into finite element models. And tensile experimental research is also performed to validate the finite element models. Good agreement between the numerical and experimental results builds confidence that the finite element models are effective in predicting the shimming effect. And it is also observed that the mechanical behaviors of composite assembly structures with different filling present obvious differences.

scholarly journals Local Buckling Characteristics of Stainless-Steel Polypropylene Deep-Sea Sandwich Pipe under Axial Tension and External Pressure

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4866
Author(s):  
Jianxing Yu ◽  
Weipeng Xu ◽  
Nianzhong Chen ◽  
Sixuan Jiang ◽  
Shengbo Xu ◽  
...  
Keyword(s):  
Finite Element ◽  
Local Buckling ◽  
External Pressure ◽  
Loading Path ◽  
Finite Element Models ◽  
Collapse Pressure ◽  
Loading Paths ◽  
Axial Tension ◽  
The Difference ◽  
Good Agreement

In this paper, the effects of different loading paths of axial tension and external pressure on the collapse pressure of sandwich tubes are studied by experiments and finite element models. The difference of the two loading paths is investigated. Eight experiments were carried out to study the influence of different loading paths on pipeline collapse pressure under the same geometric and material parameters. Parameterization studies have been carried out, and the results are in good agreement with the experimental results. The test and finite element results show that the loading path of external pressure first and then the axial tension (P→T) is more dangerous; the collapse pressure of the sandwich pipe is smaller than the other. Through parametric analysis, the influence of the axial tension and the diameter-to-thickness ratio of the inner and outer pipe on the collapse pressure under different loading paths are studied.

Analytical and Computational Models for Investigations of Local Buckling in Honeycomb Sandwiches

2007 ◽  
Vol 539-543 ◽  
pp. 2467-2472 ◽  
Author(s):  
D.H. Pahr ◽  
F.G. Rammerstorfer
Keyword(s):  
Finite Element ◽  
Computational Models ◽  
Local Buckling ◽  
Core Material ◽  
Finite Element Models ◽  
Cell Models ◽  
Wall Buckling ◽  
Plane Compression ◽  
Core Height ◽  
Honeycomb Cores

This work highlights and solves problems with the prediction of the compressive strength, limited by local instabilities, of sandwich material compounds based on honeycomb cores and very thin facesheets. Analytical methods in conjunction with periodic finite element unit cell models are utilized for this task. The finite element models are found to be well suited for all kinds of buckling predictions. Different uni- and bi-axial loadings are considered as well as influences of core height, core material, core geometry, and facesheet thickness are investigated. Finally, a new analytical approach is introduced for the treatment of the rather unexpected core cell wall buckling under in-plane compression of the sandwich, which predicts the critical load very accurately.

scholarly journals Numerical analysis of steel columns stabilized by sandwich panels

2017 ◽  
Vol 50 (2) ◽  
pp. 97-113
Author(s):  
Zhongcheng Ma ◽  
Jarmo Havula ◽  
Markku Heinisuo
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Ambient Temperature ◽  
Sandwich Panels ◽  
Finite Element Models ◽  
Lateral Stiffness ◽  
Steel Columns ◽  
Different Types ◽  
Full Scale Tests ◽  
Loading Eccentricity

Two different types of finite element models to simulate the steel columns supported by sandwich panels are developed in this paper and validated by the full-scale tests by Hedman-Petursson (2001) at ambient temperature. The bracing forces in self-drilling screws, the effect of connections in horizontal joints, effects of the lateral stiffness of self-drilling screws are studied using the developed FE models. Effect of different configurations of loading eccentricity on the buckling resistances of steel columns supported by sandwich panels are further analyzed in this paper.

Sign in / Sign up

Export Citation Format

Share Document