Ultimate Strength of Ships and Offshore Structures
Carlos Guedes Soares 1
#The Author(s)2021
The asssment of the ultimate strength of floating struc-tures is an esntial step in their design process and thus it is included as one of the checks in the Rules of Classification Societies.Several years ago,the Rule re-quirement was bad on the ction modulus associated with the yield condition,a situation that has been shown to be clearly conrvative by an amount that would de-pend on the geometry of the ction.The development of methods to quantify the ultimate strength,including the ability of numerical methods to deal with tho predic-tions in a relatively cost-efficient manner,led to proposals that the ultimate strength should be ud as the reference value expressing the strength of the ship hull structure (Guedes Soares et al.1996),which was adopted 10years later by the Classification Societies in their Common Structural Rules (CSR 2006;IACS 2014).Indeed,the prent status of design relies on ultimate strength asss-ment and on nonlinear wave induced loads,which have been covered in and earlier special issue (Guedes Soares and Duan 2018).
Different numerical methods have been developed for ulti-mate strength asssment and new simplified approaches are continuously being propod,as simplified methods dully calibrated and validated are always welcome as substitutes of very heavy computational approaches.The Common Structural Rules,prescribe simplified methods such as the one of Smith (1977)for the asssment of hull girder collap and of Gordo and Guedes Soares (1993)for the ulti-mate strength of stiffened panels.
The ultimate strength asssment,which was primarily concerned with intact structures,have been extended to dam-aged structures,including both the prediction of damage in-duced in accidental situations as the residual strength of dam-aged structures.Again,it has been the improved capabilities of numerical methods that allowed the study of the complicat-ed geometries of damaged structures that allowed the design work to rely on this type of predictions.
This special issue covers various of the aspects,including papers of review nature with others prenting new rearch results.The paper by Tekgoz et al.(2020)is a typical review paper that covers the area of the ultimate strength of ageing and damaged ship structures,dealing extensively with numer-ical,analytical and experimental work on plates,stiffened panels and hull girders that have suffered aging due for exam-ple to corrosion and fatigue or damage due for example to minor c
ollisions.
Liu et al.(2020)concentrates on aluminium structures and at the same time as it prents a good review of the work done on ultimate strength of plates and stiffened panels in alumin-ium,it also includes a rearch contribution using finite ele-ment analys to study the influence of manufacturing tech-nology on the ultimate compressive strength of aluminium-alloy stiffened panels.As an important problem in aluminium structures is the heat-affected zone associated with welding,the study compares the performance of the panels with ex-truded ones,which are being ud in progressively more applications.
电脑着火了Barsotti et al.(2020)prent an overview of recent indus-trial developments of marine composites limit states asss-ments and design approaches,focusing on pleasure crafts and yachts as well as navy ships.Inter-ply and intra-ply failure modes are discusd and the corresponding limit states are prented.The main factors influencing marine composite ro-bustness were found to be three-dimensional aspects in failure
*Carlos Guedes Soares
******************************.ulisboa.pt
1
Centre for Marine Technology and Ocean Engineering (CENTEC),Instituto Superior Técnico,Universidade de Lisboa,1409-001Lisboa,Portugal
doi/10.1007/s11804-020-00190-y
Published online: 15 January 2021Journal of Marine Science and Application (2020) 19:509–511
modes and manufacturing methods as well as fire resistance and joining techniques.
Romanoff et al.(2020)deals with a very special type of problem somewhat associated with crui ships,in which de-velopments of lar-welded thin-walled steel plates have been made in order to keep light weight at the same time avoiding the weld induced distortions induced by conventional arc welding.This type of structural elements have found applica-tion in other vesls and the authors review work that has been done in collision simulations bad on finite element analysis of this type of structures.
Wahab et al.(2020)prent a different type of prob-lem,which is related with fixed offshore jacket platforms that have been ud for many years and are subjected to the problems of planning approp
riately their maintenance and eventually develop studies of life extension.The de-sign limit state of the platforms is generally the ultimate strength and thus the paper deals with the problems that degrade the strength of the structures,discussing how a good maintenance plan can maintain the structural strength for longer periods.
The other papers in this issue deal with more specific prob-lems,prenting rearch results.A first group deals with the buckling strength of shell structures mainly ud in suba applications,while the other papers deal with stiffened panels and with ship hull girders.梦见发大水了是什么征兆
Cho et al.(2020)deal with steel-welded hemispheres under external hydrostatic pressure,Zhang et al.(2020)with the buckling of multiple intercting spherical shells under uni-form external pressure and Al-Hamati et al.(2020)study the buckling properties of a suba function chamber for oil and gas processing in deep-waters.
Lee and Paik(2020)study the ultimate compressive strength computational modelling for stiffened plate panels with non-uniform thickness,a situation that occurs when there is the need to have a transition between plates with different thickness.
The rest of the papers deal with the hull girder.Nouri and Khedmati(2020)and Vu and Dong(2020)stu
dy the ultimate strength of hull girders deteriorated with different types of corrosion,while Xu and Guedes Soares(2020)study the in-fluence of collision damage on the ultimate strength of hull girders.They consider a box girder reprenting the parallel middle body of tankers and similar vesls and they validate their finite element model against experiments,before analysing the effect of an impact on different locations, asssing afterwards the residual strength of the damaged structure.
Primorac et al.(2020)continue with the topic of damaged ship hulls by collision or grounding and they analy the problem of conducting a structural reliability asssment of the damaged ship hulls adopting the procedures recommended in IMO(2006),and they discuss the various limitations of the prently recommended approach.
This t of papers prent a good overview of current problems related with the strength asssment of ship and offshore structures,with a certain emphasis on damaged structures,as this type of topic has attracted the attention of veral rearches in the recent past,and the are in general more complicated problems than dealing with un-damaged structures.We hope that this collection of papers will contribute to an overview of this general topic,which can be of interest to readers.
奇妙的感觉510Journal of Marine Science and Application
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C.G.Soares:Ultimate Strength of Ships and Offshore Structures
