A concise introduction to the idealized structural unit method for nonlinear analysis of large plated structures and its application

The idealized structural unit method (ISUM) has now been widely recognized by researchers as an efficient and accurate methodology to perform nonlinear analysis of large plated structures such as ships, offshore platforms, box girder bridges or other steel structures. This paper presents a summary of pertinent ISUM theory and its application to nonlinear analysis of steel plated structures. Important concepts for development of various ISUM units which are needed to analyze nonlinear behavior of steel plated structures are described. Some application examples are shown, wherein comparisons of ISUM analysis predictions are made with numerical or experimental results for progressive collapse analysis of general types of steel plated structures and ship hulls, to illustrate the possible accuracy and versatility of the ISUM method. The use of ISUM for the analysis of internal collision/grounding mechanics of ships is also illustrated. This paper is in part an attempt to demystify ISUM and its applications for the benefit of a designer of steel plates structures (Paik and Thayambali, Ultimate limit state design of steel plated structures; 2002).

[1]  Yong Bai,et al.  COLLAPSE ANALYSIS OF SHIP HULLS , 1993 .

[2]  Y Ueda,et al.  THE IDEALIZED STRUCTURAL UNIT METHOD INCLUDING GLOBAL NONLINEARITIES--IDEALIZED RECTANGULAR PLATE AND STIFFENED PLATE ELEMENTS , 1986 .

[3]  Jeom Kee Paik,et al.  Ultimate limit state design of steel-plated structures , 2003 .

[4]  Ge Wang,et al.  Behavior of a double hull in a variety of stranding or collision scenarios , 2000 .

[5]  Masahiko Fujikubo,et al.  Longitudinal and Transverse Thrust , 2000 .

[6]  Ueda Yukio,et al.  The idealized structural unit method and its application to deep girder structures , 1984 .

[7]  Jeom Kee Paik,et al.  Modelling of the internal mechanics in ship collisions , 1996 .

[8]  K. Masaoka,et al.  A Rectangular Plate Element for Ultimate Strength Analysis , 1998 .

[9]  Yukio Ueda,et al.  7. An Ultimate Transverse Strength Analysis of Ship Structures , 1975 .

[10]  Y Ueda,et al.  ADVANCES IN THE APPLICATION OF ISUM TO MARINE STRUCTURES , 1991 .

[11]  Jeom-K. Paik.  Advanced Idealized Structural Units Considering the Excessive Tension-Deformation Effects , 1993 .

[12]  Yukio Ueda,et al.  An Ultimate Transverse Strength Analysis of Ship Structure , 1974 .

[13]  Jeom Kee Paik,et al.  A numerical investigation of tripping , 1998 .

[14]  Jeom Kee Paik,et al.  On rational design of double hull tanker structures against collision. Discussion. Authors' closure , 1999 .

[15]  Alan Brown,et al.  Structural Design and Response in Collision and Grounding , 2000 .

[16]  Jeom Kee Paik,et al.  PLATE AND STIFFENED PLATE UNITS OF THE IDEALIZED STRUCTURAL UNIT METHOD (2ND REPORT): UNDER IN-PLANE AND LATERAL LOADING CONSIDERING INITIAL DEFLECTION AND RESIDUAL STRESS , 1984 .

[17]  J. A. Battjes.  Behaviour of offshore structures : proceedings of the 4th International Conference on Behaviour of Offshore Structures (BOSS '85), Delft, the Netherlands, July 1-5, 1985 , 1985 .