课件 Ship management (船舶管理) 1.6 Structural Strength Chapter 1 task6 Structural Strength.pptx

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课件 Ship management (船舶管理) 1.6 Structural Strength Chapter 1 task6 Structural Strength.pptx

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江苏高校省级留学生英文授课精品课程船舶管理Ship managementTeacher： HU HUIHUI (Lisa)Task 6 Structural Strength目录/Contenttatic Forces on Ship in Still WaterFunction of the Ship StructureForces on a Ship at SeaThe Static Longitudinal Strength Calculation目录/Contents050706Characteristics of Shearing Force and Bending Moment CurvesLongitudinal Bending Stress of a ShipUse of Static Longitudinal Strength CalculationTask 6 Structural StrengthIt was stated that one of the requirements in the design of a ship was that the structure be sufficiently strong to withstand without failure the forces imposed upon it when the ship is at sea. In this chapter the problem of structural strength will be studied in more details.Task 6 Structural StrengthThe problem consists first of all in assessing the forces acting on the ship and secondly in determining the response of the structure to those forces, i.e. in deformation of the structure. The structural strength problem is really a dynamic one. It has been seen that the ship is rarely in calm water and in consequence the motion of the sea generates motions in the ship itself. Task 6 Structural StrengthThe motions generated because of the six degrees of freedom of the ship, i.e. heaving, swaying and surging, which are linear motions, and rolling, pitching and yawing, which are rotations, all involve accelerations which generate forces on the structure. Task 6 Structural StrengthIt is also important to recognize that even in still water the ship is subjected to forces which distort the structure, the forces being due to hydrostatic pressure and the weight of the ship and all that it carries. Task 6 Structural StrengthA complete study of structural strength should take into account all these forces and in the present day development of subject this is in fact what is done. It is fitting, however, to examine the problem from the static point of view first of all.Task 6 Structural StrengthStatic Forces on Ship in Still WaterIt has been seen that the hydr