The structural design of tankers
Başlık:
The structural design of tankers
Yazar:
Marshall, R. W., author.
ISBN:
9780438057616
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (147 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-08C.
Advisors: J. F.C Conn.
Özet:
A procedure is described for obtaining the scantlings of the longitudinal material in oil tankers and similar vessels from first principles. No reference is made to the rules of a Ship Classification Society, Instead, a computer program is used to analyse an initial midship section design under the combinations of shearing force, bending moment and pressure head loads likely to produce the highest stresses. This program is based on the usual theory of bending of beams and Batho-Bredt theory is used to obtain the shear flow distributions. A redesign procedure is then used to modify this initial design in such a way that the constraints on yielding and stability are satisfied. Using the now design as the starting point, the analysis - redesign procedure is repeated until successive midship section designs are identical. A routine is also given for predicting the wave bending moments and shearing forces along the length of a ship. In the routine, the ship is assumed to be statically poised on a trochoidal wave, the pressure distribution in which may be corrected for the Smith Effect. The theory behind these routines and also the FORTRAN computer programs to perform the calculations are given. The wave bending moment routine and the analysis routine are used to analyse a 260,000 d.w.t. tanker built to Lloyd's Rules. The loads assumed to act on the hull are discussed in detail. It is shown that the stresses in the plating of the longitudinal bulkhead are considerably higher than the yield point of the material. The longitudinal stiffeners appear to be understressed. Using the same loads as in the above design, the scantlings of the midship section are derived from first principles. It is shown that a factor of safety of 1.40 on yielding and stability gives a midship section area and inertia similar to Lloyd's design. The principal differences are the heavier plating and the lighter stiffeners in the design derived from first principles. From design studies with this method, it is concluded that variations in stiffener spacing and longitudinal bulkhead position offer little scope for weight saving. Greater gains appear to be possible through an improved knowledge of the loads on, and structural behaviour of, the hull girder. A procedure is described for obtaining the scantlings of the longitudinal material in oil tankers and similar vessels from first principles. No reference is made to the rules of a Ship Classification Society. Instead, a computer program is used to analyse an initial midship section design under the combinations of shearing force, bonding moment and pressure head loads likely to produce the highest stresses. This program is based on the usual theory of bending of beams and Batho-Bredt theory is used to obtain the shear flow distributions. A redesign procedure is then used to modify this initial design in such a way that the constraints on yielding and stability are satisfied. Using the new design as the starting point, the analysis - redesign procedure is repeated until successive midship section designs are identical A routine is also given for predicting the wave bending moment and shearing forces along the length of a ship. In the routine the ship is assumed to be statically poised on a trochoidal wave, the pressure distribution in which may be corrected for the Smith Effect. The theory behind these routines and also the FORTRAN computer programs to perform the calculations are given. The wave bending moment routine and the analysis routine are used to analyse a 250,000 d.w.t, tanker built to Lloyd's Rules. The leads assumed to act on the hull are discussed in details It is shown the' the stresses in the plating of the longitudinal bulkhead are considerably higher than the yield point of the material. The longitudinal stiffeners appear to be understressed. Using the same loads as in the above design, the scantlings of the midship section are derived from first principles. It is shown that a factor of safety of 1.40 on yielding and stability gives a midship section area and inertia similar to Lloyd's design. The principal difforences are the heavier plating and the lighter stiffeners in the design derived from first principles. From design studios with this method, it is concluded that variations in stiffener spacing and longitudinal bulkhead position offer little scope for weight saving. Greater gains appear to be possible through an improved knowledge of the loads on, and structural behaviour of, the hull girder.
Notlar:
School code: 0547
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(684620.1) | 684620-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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