INVESTIGATION OF CONCRETE-FILLED STEEL COMPOSITE (CFSC) STUB COLUMNS WITH BAR STIFFENERS

This paper is concerned with the investigation of concrete-filled steel composite (CFSC) stub columns with bar stiffeners. In order to study the behaviour of the columns, the finite element software LUSAS is used to conduct the non-linear analyses. Results from the non-linear finite element analysis and the corresponding experimental test are compared which reveal the reasonable accuracy of the three-dimensional finite element modelling. A special arrangement of bar stiffeners in the columns with various number, spacing and diameters of the bar stiffeners are developed and studied using the non-linear finite element method. Effects of various variables such as different number and spacing of the bar stiffeners and also steel wall thicknesses on the ultimate axial load capacity and ductility of the columns are examined. Moreover, effects of different diameters of the bar stiffeners, concrete compressive strengths and steel yield stresses on the ultimate axial load capacity of the columns are evaluated. It is concluded from the study that the variables significantly influence the behaviour of the columns. The obtained results from the finite element analyses are compared with those predicted values by the design code EC4 and suggested equations of the previous researches.

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Study on Manufacture Technology for Enhancing the Life of Mining Flat Type Chain Connector Units

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.156-157.153 ◽

2010 ◽

Vol 156-157 ◽

pp. 153-156

Author(s):

Jun Mao ◽

Wei Kang Li ◽

Jian Gang Li

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Element Analysis ◽

Tooth Structure ◽

Finite Element Software ◽

Linear Finite Element ◽

Element Simulation ◽

Non Linear ◽

Structure Strength ◽

A Chain

To enhance the structure strength and working life of the existing ladder-type chain connector, and chain connector productivity and manufacture craftwork. The ANSYS finite element software is utilized to simulate contact non-linear finite element analysis of ladder type chain connector. And the static and dynamic experiments are carried on several samples. Finite element simulation results show that the main part of stress concentration is in teeth roots; experiments results show that the teeth roots are the fragile parts in the chain connector, the results of finite element analysis is conformed to the results of the experiments, thus that the ANSYS finite element software is utilized to simulate contact non-linear finite element analysis of chain connector is reasonable. Because of the shortcoming of straight tooth chain connector, then promoted a chain connector of cambered surface tooth structure. Through the analysis, it shows that cambered surface can augment the contact areas in teeth, and prevent partial loading in teeth meshing. When chain connector manufactured, clamping tongs are quite complex, but the petal-type clamps structures are adopted, that can carry out volume-producing, thereby, and the productivity and processing precision are improved.

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Numerically Efficient Three-Dimensional Model for Non-Linear Finite Element Analysis of Reinforced Concrete Structures

Materials ◽

10.3390/ma14071578 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1578

Author(s):

Sławomir Dudziak

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Reinforced Concrete ◽

Shear Failure ◽

Load Capacity ◽

Model Verification ◽

Element Analysis ◽

Rc Structures ◽

Linear Finite Element ◽

Non Linear

The paper concerns the non-linear finite element analysis (NLFEA) of Reinforced Concrete (RC) structures for engineering applications. The required level of complexity of constitutive models for such analysis was discussed and non-linear elastic models combined with the smeared cracking approach proved to be efficient. A new constitutive hypoelastic-brittle model of concrete based on these assumptions was proposed. Moreover, a method including the tension stiffening effect (TS) was developed. This phenomenon is connected with the bond properties between concrete and steel and, in some situations, has significant influence on the deflections of RC structures. It is often neglected by or included in the constitutive model of concrete. In the paper, an alternative approach was presented, in which this phenomenon is taken into account by generalising the material model of reinforcing steel. This approach is consistent with modern design standards and has solid physical foundations. The proposed models were implemented in the Abaqus code via UMAT user’s procedure coded in FORTRAN. Model verification and validation were presented in four case studies, concerning: a Willam’s test (examination on material point level), a beam with bending failure, and two beams with shear failure (with and without stirrups). The obtained results were compared with experimental outcomes and numerical results obtained by other researchers. The presented approach enables the accurate prediction not only of load capacity but of structural deformability, due to the precise description of TS. Thus, it promises to be a useful engineering tool.

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Study on Enhancing the Strength and Life of Mining Flat Type Chain Connector Units Based on CAE

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.40-41.722 ◽

2010 ◽

Vol 40-41 ◽

pp. 722-726

Author(s):

Jun Mao ◽

Wei Kang Li ◽

Jian Gang Li

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Experimental Results ◽

Element Analysis ◽

Finite Element Software ◽

Linear Finite Element ◽

Flat Type ◽

Dynamic Experiments ◽

Non Linear ◽

Structure Strength

ANSYS finite element software was utilized to simulate contact non-linear finite element analysis of chain connector for enhancing the structure strength and working life and productivity and manufacture craftwork of the existed ladder-type chain connector. Static and dynamic experiments were carried on several samples to test the broken positions of the chain connectors. The simulation results show that the main part of stress concentration is in teeth roots; experimental results also show that the teeth roots are the fragile parts in the chain connector. So experimental results conform to the results of simulation, it is reasonable for the simulation of contact non-linear finite element analysis of chain connector by ANSYS software. Then a structure of cambered surface tooth is promoted to enhance the strength and life of teeth parts, and petal-type clamps structure is adopted, that can carry out volume-producing to improve the productivity and processing precision.

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