考虑构件重要性的导管架平台强度储备提升

发布时间：2018-10-18 10:47

【摘要】：导管架平台空间造型复杂,杆件和节点数量繁多,局部冗余度虽然高但总体分布不均匀。同时,平台质量大多集中于上部结构,局部构件的破坏可能导致结构在重力载荷作用下发生连续性倒塌。本文在导管架平台常遇的冰工况载荷作用下,对移除各个构件后的缺陷结构进行推覆分析,得到各构件重要性指标,依此判断每个构件的重要性;分析不同首失效构件导致的结构薄弱路径,从而确定结构的最薄弱路径和路径起始构件位置;进而,在保证总用钢量不变的条件下,调整构件截面设计,实现结构薄弱环节的调控。研究表明:通过构件重要性分析的方法,可以较有效地确定结构薄弱路径;通过调整薄弱路径首个构件的方法,可以实现薄弱路径的调整,结构的极限承载力提高10%以上,极限变形降低10%左右。
[Abstract]:The space modeling of jacket platform is complex, the number of bars and nodes is various, the local redundancy is high, but the overall distribution is not uniform. At the same time, the mass of the platform is mostly concentrated on the superstructure, and the failure of the local members may lead to the continuous collapse of the structure under the action of gravity load. In this paper, under the action of the ice load often encountered on the jacket platform, the defected structure after removing each component is analyzed, and the importance index of each component is obtained, according to which the importance of each member is judged. The structural weak path caused by different head failure members is analyzed to determine the weakest path of the structure and the location of the starting member, and then, under the condition that the total steel consumption is constant, the section design of the member is adjusted. To achieve structural weak links of regulation and control. The results show that the structural weak path can be determined effectively by the method of component importance analysis, the adjustment of the weak path can be realized by adjusting the first component of the weak path, and the ultimate bearing capacity of the structure can be increased by more than 10%. The limit deformation is reduced by about 10%.
【作者单位】：大连理工大学船舶工程学院;
【基金】：国家自然科学基金项目(50908036) 辽宁省自然科学基金项目(201202040)
【分类号】：P75

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