TAILIEUCHUNG - Ship Stability for Masters and Mates 5 Episode 11

Tham khảo tài liệu 'ship stability for masters and mates 5 episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Bending of beams 339 applied to find the longitudinal shearing forces and bending moments in floating vessels. Sufficient accuracy of prediction can be obtained. However beam theory such as this cannot be used for supertankers and ULCCs. For these very large vessels it is better to use what is known as the finite element theory. This is beyond the remit of this book. EXERCISE 40 1 A beam AB of length 10 m is supported at each end and carries a load which increases uniformly from zero at A to tonnes per metre run at B. Find the position and magnitude of the maximum bending moment. 2 A beam 15 m long is supported at its ends and carries two point loads. One of 5 tonnes mass is situated 6 m from one end and the other of 7 tonnes mass is 4 m from the other end. If the mass of the beam is neglected sketch the curves of shearing force and bending moments. Also find a The maximum bending moment and where it occurs and b The bending moment and shearing force at 3 of the length of the beam from each end. Chapter 41 Bending of ships Longitudinal stresses in still water First consider the case of a homogeneous log of rectangular section floating freely at rest in still water as shown in Figure . The total weight of the log is balanced by the total force of buoyancy and the weight W of any section of the log is balanced by the force of buoyancy B provided by that section. There is therefore no bending moment longitudinally which would cause stresses to be set up in the log. Now consider the case of a ship floating at rest in still water on an even keel at the light draft as shown in Figure Although the total weight of the ship is balanced by the total force of buoyancy neither is uniformly distributed throughout the ship s length. Imagine the ship to be cut as shown by a number of transverse sections. Imagine too that each section is watertight and is free to move in a vertical direction until it displaces its own weight of water. The weight of each of the end .

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