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Assessment of buckling behaviour on an FPSO deck panel

Ozguc Ozgur

Polish Maritime Research

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2020

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nr 3

50--58

EN

Stiffened plates are the main structural building block in ship and offshore hulls and their structural response subject to loads is a topic of significant practical interest in ship and offshore structural design. To investigate the structural capacity for design and evaluation purposes, it is becoming an efficient and reliable practice to carry out non-linear finite element (FE) analysis. The present study is to assess the buckling strength of a stiffened deck panel on an FPSO vessel using the nonlinear finite element code ADVANCE ABAQUS, where imperfection sensitivity work is also accounted for. The cases studied correspond to in-plane bi-axial compression in the two orthogonal directions. The findings are compared with the DNVGL PULS (Panel Ultimate Limit State) buckling code for the stiffened panels. It is found that the strength values from the ADVANCE ABAQUS and DNVGL PULS code are very close. The results and insights developed from the present work are discussed in detail.

2

Estimation of buckling response of the deck panel in axial compression

Ozguc O.

Polish Maritime Research

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2018

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nr 4

98--105

EN

In this work, buckling strength assessment of a deck of a double hull oil tanker is carried out using the non-linear finite element code ADVANCE ABAQUS. The comparisons are performed with the Det Norske Veritas (DNV-GL) PULS (Panel Ultimate Limit State) buckling code for the stiffened panels, DNV-GL Classification Notes (CN) No.30.1 and the DNV-GL Ship Rules. The case studied corresponds to axial compression. Two levels of imperfection tolerances are analyzed, in accordance with the specifications in the DNV-GL Instruction to Surveyors (IS) and the DNV-GL Classification Notes No. 30.1. Both “as built” and DNV–GL Rule “net” dimensions are analyzed. The strength values from ADVANCE ABAQUS and PULS are very close. DNV-GL CN 30.1 is in conservative side, but the strength differences between the “as built” and “net” dimension cases are consistent with the finite element analysis results. This paper gives a brief description of the background for the stiffened panel models used in PULS, and comparison against non-linear FE analysis, and DNV-GL Classification Society Rules. The finite element code ADVANCE ABAQUS is employed in a non-linear buckling analysis of a stiffened deck panel on a double skin tanker that is subjected to a Condition Assessment Program (CAP) hull survey. The aim of the analyses has been to validate and compare the buckling capacity estimates obtained from PULS, DNV-GL Classification Notes No.30.1 (CN 30.1) and the DNV-GL Ship Rules.

3

Kształtowanie płyt pomostów mostów drogowych z kompozytów FRP

Kulpa M., Siwowski T.

Czasopismo Inżynierii Lądowej, Środowiska i Architektury / Journal of Civil Engineering, Environment and Architecture

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2015

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z. 62, nr 3/II

263--283

PL

Konieczność zwiększenia trwałości pomostów drogowych obiektów mostowych nadała w ostatnich latach bardzo duży impuls pracom badawczym, których celem jest stworzenie nowych rodzajów płyt pomostów mostów drogowych: trwałych, lekkich i łatwych w montażu, wykonanych z zaawansowanych technologicznie materiałów. Wśród tych materiałów najszersze zastosowanie w mostach w ostatnich latach mają kompozyty FRP (fibre reinforced polymers). W artykule przedstawiono przegląd systemów płyt pomostów wykonywanych z kompozytów FRP. Nacisk położono głównie na kształtowanie geometryczne płyt w zależności od przyjętej technologii wytworzenia kompozytu. Dokonano podziału na trzy główne grupy kompozytowych płyt pomostowych: wykonywanych metodą infuzji, pultruzji oraz płyt hybrydowych, tj. kompozytowo-betonowych. Porównano wady i zalety poszczególnych rodzajów płyt pomostów oraz dokonano wyboru optymalnej kosztowo konstrukcji i technologii do własnych prac badawczych. W ramach badań własnych zaprojektowano i wykonano trzy prototypowe panele pomostów z kompozytów warstwowych (typu sandwich) o różnym układzie konstrukcyjnym. Na podstawie wyników badań wytrzymałościowych ustalono nośność i sztywność poszczególnych paneli. Porównanie tych parametrów pozwoliło na wybór rozwiązania panelu do dalszych prac badawczych i wdrożeniowych.

EN

The growing need of durability enhancement for road bridge decks has recently caused the big impulse for research on new, durable, lightweight and easy to handle bridge decks, made of advanced materials, f.e. FRP (fibre reinforced polymers). The paper reviews the most common bridge deck systems made of FRP composites. The emphasis was mainly on the shaping the geometric depending on the technology manufacturing. The systems were divided into three groups: bridge decks made by pultrusion, infusion and hybrid concrete-FRP composite. In the next step own cross-section of decks were developed, designed and three different prototypes of panels were made in full scale (dimensions in plan 1,1 × 2,7 m). The last stages were tests of the three bridges sandwich panels with different structural arrangement. Based on tests, the strength of panels its load capacity and stiffness were established. Comparison of these characteristics and experience gained during making prototypes, allowed to choose the best panel for further research and implementation.