A Numerical Study on the Ultimate Strength of Damaged Tubular Bracing Members Under Axial Compression

2018 ◽  
Author(s):  
Ling Zhu ◽  
Jieling Kong ◽  
Qingyang Liu ◽  
Han Yang ◽  
Bin Wang
Keyword(s):  
Ultimate Strength ◽  
Axial Compression ◽  
Numerical Study ◽  
Load Capacity ◽  
Approximate Equation ◽  
Offshore Structures ◽  
Experimental Investigations ◽  
Pipe Length ◽  
Axial Load Capacity ◽  
Parametric Studies

The tubular bracing members of offshore structures may sustain collision damages from the supply ships, which lead to the deterioration of the load carrying capacity of tubular bracing members. This paper presents a numerical simulation of the ultimate strength of damaged tubular bracing members under axial compression with the nonlinear finite element code ABAQUS, based on previous experimental investigations. Parametric studies are conducted to investigate the load capacity of damaged tubular bracing members, by considering the effects of diameter (D), wall thickness (H), pipe length (L) and the damage positions on the ultimate strength of tubular members. It is found that lateral damage can cause great reduction of the axial load capacity of tubular members. In addition, an approximate equation to predict the ultimate strength of tubular members based on the given damage depth is proposed.

Ultimate strength of steel beam-columns under axial compression

2017 ◽  
Vol 231 (4) ◽  
pp. 828-843
Author(s):  
Zhongwei Li ◽  
Mayuresh Patil ◽  
Xiaochuan Yu
Keyword(s):  
Ultimate Strength ◽  
Axial Compression ◽  
Beam Theory ◽  
Computer Code ◽  
Offshore Structures ◽  
Element Analysis ◽  
Beam Columns ◽  
Geometrically Exact Beam ◽  
Steel Panels ◽  
Geometrically Exact Beam Theory

This article presents a semi-analytical method to calculate the ultimate strength of inelastic beam-columns with I-shaped cross section using geometrically exact beam theory. A computer code based on this method has been applied to beam-columns under axial compression. The results agree with nonlinear finite element analysis. Compared with previous step-by-step integration approach, this new method is more efficient and can be extended to multi-span beam-columns and other load combinations including lateral pressure. The presented beam-column model is ideally suited for ultimate strength prediction of stiffened steel panels of ships and offshore structures.

Design equations for axially loaded reinforced concrete columns strengthened with fibre reinforced polymer wraps

2000 ◽  
Vol 27 (5) ◽  
pp. 1011-1020 ◽  
Author(s):  
Michèle Thériault ◽  
Kenneth W Neale
Keyword(s):  
Reinforced Concrete ◽  
Load Capacity ◽  
Axial Loading ◽  
Concrete Columns ◽  
Experimental Investigations ◽  
Reinforced Concrete Columns ◽  
Reinforced Polymer ◽  
Axial Load Capacity ◽  
Fibre Reinforced Polymer ◽  
Future Work

Step-by-step design procedures are proposed for the axial load capacity enhancement of circular and rectangular reinforced concrete columns confined with fibre reinforced polymer (FRP) wraps. The design methods are intended for practicing engineers in that they are relatively simple to apply and are made readily available in a design code format. Commentaries are presented to explain the design philosophy and rationale leading to the various design equations. For purposes of validation, numerical results based on the proposed design equations are compared against available experimental data. Strengthening limits, as governed by creep and fatigue phenomena, are also proposed. Whenever test data are found to be too limited, conservative approaches are adopted. Various experimental investigations are suggested for future work to further validate and update the design equations.Key words: FRP strengthening, concrete columns, axial loading, confinement, design.

Numerical Study about Combined Effect of Distributed Initial Imperfections and Dent on Ultimate Strength of Square Plates under Uni-Axial Compression

2015 ◽  
Vol 813-814 ◽  
pp. 1037-1041 ◽  
Author(s):  
Duraikannou Peroumal ◽  
E. Sidhuvilaji ◽  
B. Prabu ◽  
A.V. Raviprakash
Keyword(s):  
Ultimate Strength ◽  
Axial Compression ◽  
Thick Plate ◽  
Numerical Study ◽  
Combined Effect ◽  
Geometric Imperfections ◽  
Buckling Strength ◽  
Initial Imperfections ◽  
Numerical Result ◽  
Local Dent

Aim of this present work is to study the combined effect of distributed geometric global imperfection and a local dent on buckling strength of thin square plates subjected to uni-axial compression. Steady state non linear FE analysis including both material and geometrical non linearities is used to determine the ultimate strength of the dented plates. From the numerical result it is found that in case of low thickness plates global geometric imperfections effect is more dominant and in case of thick plate dent effect is found to be more dominant.

Lateral Pressure Effects on the Ultimate Strength of Plates

2015 ◽  
Author(s):  
Lei Jiang ◽  
Shengming Zhang
Keyword(s):  
Ultimate Strength ◽  
Lateral Pressure ◽  
Numerical Study ◽  
Offshore Structures ◽  
Pressure Effects ◽  
Finite Element Program ◽  
Stiffened Panels ◽  
Element Program ◽  
Ocean Environment ◽  
Ultimate Load Carrying Capacity

During the operations of ships and offshore structures in the ocean environment, these structures are subjected to combined lateral pressure and in-plane stresses. However, in today’s ship design and analysis procedures, the effects of the lateral pressure on the ultimate strength of these structures are often ignored. Previous studies have indicated that the lateral pressure could have a noticeable influence on the ultimate load carrying capacity of stiffened panels when they are subjected to combined longitudinal and transverse stresses. The purpose of this paper is to present a systematic numerical study to quantify the lateral pressure effects on the ultimate strength of plates. The sensitivity of the plate’s ultimate strength to lateral pressure is characterized as a function of the plate geometry, the pressure magnitude and the ratio of the in-plane stress components. The present numerical study is performed by using LR’s in-house nonlinear finite element program VAST and the newly development LR procedure for nonlinear structural mechanics analysis was followed. The results and findings from this study are detailed in this paper.

Axial load-capacity of rectangular cement stabilized rammed earth column

2015 ◽  
Vol 99 ◽  
pp. 402-412 ◽  
Author(s):  
Deb Dulal Tripura ◽  
Konjengbam Darunkumar Singh
Keyword(s):  
Axial Load ◽  
Load Capacity ◽  
Rammed Earth ◽  
Axial Load Capacity

Axial load capacity of cylindrical shells with local geometric defects

1991 ◽  
Vol 31 (2) ◽  
pp. 104-110 ◽  
Author(s):  
S. Krishnakumar ◽  
C. G. Foster
Keyword(s):  
Axial Load ◽  
Load Capacity ◽  
Cylindrical Shells ◽  
Axial Load Capacity

A combined experimental and numerical analysis on the seismic behavior of short reinforced concrete columns with different structural sizes and axial compression ratios

2017 ◽  
Vol 27 (9) ◽  
pp. 1416-1447 ◽  
Author(s):  
Liu Jin ◽  
Shuai Zhang ◽  
Dong Li ◽  
Haibin Xu ◽  
Xiuli Du ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Axial Compression ◽  
Seismic Behavior ◽  
Load Capacity ◽  
Concrete Columns ◽  
Simulation Method ◽  
Reinforced Concrete Columns ◽  
Mesoscopic Simulation ◽  
Energy Dissipation Capacity

The results of an experimental program on eight short reinforced concrete columns having different structural sizes and axial compression ratios subjected to monotonic/cyclic lateral loading were reported. A 3D mesoscopic simulation method for the analysis of mechanical properties of reinforced concrete members was established, and then it was utilized as an important supplement and extension of the traditional experimental method. Lots of numerical trials, based on the restricted experimental results and the proposed 3D mesoscopic simulation method, were carried out to sufficiently evaluate the seismic performances of short reinforced concrete columns with different structural sizes and axial compression ratios. The test results indicate that (1) the failure pattern of reinforced concrete columns can be significantly affected by the shear-span ratio; (2) increasing the axial compression ratio could improve the load capacity of the reinforced concrete column, but the deformation capacity would be restricted and the failure mode would be more brittle, consequently the energy dissipation capacity could be deteriorated; and (3) the load capacity, the displacement ductility, and the energy dissipation capacity of the short reinforced concrete columns all exhibit clear size effect, namely, the size effect could significantly affect the seismic behavior of reinforced concrete columns.

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