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首页> 外文会议>Offshore Symposium >SEMI-SUBMERSIBLE BRACE TO COLUMN CONNECTION - A MEANS FOR IMPROVED STRENGTH AND REDUCED STRUCTURAL WEIGHT
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SEMI-SUBMERSIBLE BRACE TO COLUMN CONNECTION - A MEANS FOR IMPROVED STRENGTH AND REDUCED STRUCTURAL WEIGHT

机译：半潜式支架到柱连接 - 一种改善强度和结构重量减少的装置

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摘要

Structural braces are provided between port and starboard columns or pontoons of semisubmersibles to reduce the bending moment at the column deck box connection created by squeeze/pry loads from hull-wave interaction. This hull-wave interaction is usually in the form of squeeze/pry action and bending caused by the relative longitudinal and vertical displacement between the pontoons caused by hull racking. Traditionally, the braces have been designed as fixed end beam/columns for withstanding axial loads. The racking displacement of the brace ends results in brace end bending moment and induced stresses at the brace to hull connection. To handle the high bending moment, the brace wall thickness must be increased, which results in a stiffer connection. Because the racking deflection is controlled by the deck box, and not the stiffness of the braces, the magnitude of this deflection remains essentially constant regardless of brace stiffness. Thus the wall thickness increase simply attracts more bending moment, more stress and further increases in wall thickness. The additional reinforcement to resist the bending stresses typically results in substantially heavier structure than required by the compressive and tensile squeeze/pry loads alone, that they are intended to resist and control. The authors have developed and analyzed an alternate structural arrangement that reduces the bending stiffness of the braces at their connection to the hull, allowing the braces to act more like pin ended column elements. The reduction in bending moment at the brace to hull connection results in reduced scantlings and a significant reduction in the weight of the braces and their associated hull structure.
机译：在端口和右舷柱或半轴的柱之间提供了结构支架，以减少通过从船体波相互作用的挤压/撬载荷产生的柱甲板箱连接处的弯矩。该船体波相互作用通常是挤压/撬动作用的形式和由船体架引起的浮翅之间的相对纵向和垂直位移引起的弯曲。传统上，括号被设计为用于承受轴向载荷的固定端梁/柱。支架的机架位移结束导致支架端部弯矩和在支架上引起的应力到船体连接。为了处理高弯矩，必须增加支撑壁厚，这导致静止连接。由于机架偏转由甲板箱控制，而不是括号的刚度，而是这种偏转的大小无论支撑刚度如何，都仍然是恒定的。因此，壁厚增加仅吸引更多的弯矩，更应力并进一步增加壁厚。抵抗弯曲应力的额外增强通常导致仅由压缩和拉伸挤压/撬载荷所需的基本上重较重的结构，它们旨在抵抗和控制。作者已经开发出并分析其减少在它们到船体连接撑杆的弯曲刚度的替代结构布置，从而允许支架作用更像销结束列元素。支架上的弯矩的减小导致船体连接的减少和牙套重量和其相关的船体结构的重量显着降低。

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