Experimental and numerical analyses of the ultimate compressive strength of perforated offshore tubular members

Vaz, Murilo Augusto; Cyrino, Júlio Cesar Ramalho; Hernández, Irving D.; Zegarra, Victor D.; Martinez, Jorge L.; Liang, Denis A.

doi:10.1016/j.marstruc.2017.10.010

Cited by 23 publications

(11 citation statements)

References 22 publications

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“…= 1.26 − 30.69 (9) where RV was the ratio of net damaged volume to total volume in the corroded area, and RSc was the percentage of residual compressive strength compared with the original strength. As for the test specimens studied herein, the RV can be attained by RV = 100-DOV in terms of the DOV decided by Eq.…”

Section: Prediction Of Ultimate Strengthmentioning

confidence: 99%

“…It is vital to model the irregular morphology of corrosion damage for ultimate strength assessment. However, the cost of corrosion inspection makes it unrealistic to obtain detailed mapping of actual corrosion, although many nondestructive measurement methods such as gamma rays and ultrasonic testing exist [9]. There is no adequate information to determine strength of corroded tubular members for inclusion of requirements in the International Standard [10].…”

Section: Introductionmentioning

confidence: 99%

“…Corrosion may perforate the wall of a member, leading to an eccentricity in the centroid of its cross section and then extra secondary bending moment [9]. Changing the location of a perforation along the length of a member was considered influential to the reduction of ultimate strength [19].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical study of localized pitting effect on compressive behavior of tubular members

2020

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Section: Prediction Of Ultimate Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical study of localized pitting effect on compressive behavior of tubular members

2020

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“…A common practice to describe imperfect geometries in numerical models, when as-built manufacture data are unavailable, is to assume a linear combination of some of the first structure's eigenvectors to promote a failure initiation [8], for example. Several authors such as Gates [9], Rigo et al [10], Lueke et al [11] and Vaz et al [12], just to mention a few, have confirmed that the shape and the magnitude of initial imperfections may significantly affect the response predictions for structures' behavior.…”

mentioning

confidence: 98%

Three-dimensional image-based approach for imperfect structures surface modeling

Hernández

Vaz

Cyrino

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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Great attention has been given, in the scientific literature, to the effect of initial imperfections on the structural behavior of experimental samples under compression loads. Geometrical reconstruction of the as-built surface is therefore required to allow accurate numerical modeling. High-precision systems for inverse engineering are expensive, and most of the times geometrical imperfections are rather complex to be described without high computational efforts. In this paper, an imagebased approach to model the surface of imperfect structures using open-source software and a common digital camera is presented. The proposed approach aims to generate high-quality surfaces from real imperfect structures, by employing the surface-from-motion and multi-view stereo techniques. A controlled frame capture is introduced to decrease both the computational effort and number of repeated correspondences. The surface fit is then computed by meshing the dense cloud of points and adjusting several surface regions describing the samples' profiles. The procedure is illustrated by using two damaged tubular member samples reconstructed by the proposed approach. Then, resulted geometries are verified by comparing measures from a three-dimensional high-precision laser scanner and a common mechanical procedure. Finally, a comparison of three-dimensional mappings of a ship panel with proposed approach and commercial photogrammetry software is performed. Verification results refer to the possibility of prototyping geometry surfaces from real imperfect samples by using inexpensive hardware and public domain software tools with acceptable level of accuracy.

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“…Vaz et al (2018) used three-dimensional laser scanning and ultrasonic thickness measurements andZhao et al (2018) used the three-dimensional digital image correlation method.…”

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confidence: 99%

A buckling behavior of elliptic perforated steel CHS columns exposed to axial compression load

Bölükbaş

Mete

2020

Lat. Am. j. solids struct.

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Maintenance work is very important for the continuation of the long service periods planned in engineering structures. Some damage to the steel elements, such as the growth of the holes in the structure, leads to reduced buckling strength and shortened service life. Moreover, the criterion of the hole is uncertain for steel structures. For this reason, it is very important to predict and evaluate the buckling strength of a damaged structure and to take necessary measures. Therefore, in this article, a series of systematic experimental studies are carried out to calculate the buckling strength of elliptical perforated steel columns. Deformation shapes and load-displacement graphs of the test columns are plotted. In addition, the behavior of the column under axial load is analyzed by constructing a finite element model. Numerical simulations are performed with Dynaform finite element package. The effect of the elliptical hole on the column buckling strength by changing the width, height and center is investigated numerically and experimentally. Prepared samples are subjected to axial loading test and compared with numerical results. In light of the data obtained from the numerical results, the effect of the width, height and center of a single elliptical hole on the buckling strength of the column is clearly demonstrated.

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Experimental and numerical analyses of the ultimate compressive strength of perforated offshore tubular members

Cited by 23 publications

References 22 publications

Experimental and numerical study of localized pitting effect on compressive behavior of tubular members

Experimental and numerical study of localized pitting effect on compressive behavior of tubular members

Three-dimensional image-based approach for imperfect structures surface modeling

A buckling behavior of elliptic perforated steel CHS columns exposed to axial compression load

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