导管架平台鲁棒性性能研究

Research on Robustness Performance of Jacket Platform

鲁棒性是结构安全需重点关注的问题之一。导管架平台作为进行海上油气资源勘探开发的主要设施,应在设计阶段考虑足够的结构鲁棒性。此文确定了基于Pushover非线性分析原理计算导管架平台结构鲁棒性的方法,明确了导管架平台的结构鲁棒性评估指标,建立了导管架平台结构鲁棒性评估流程。以东海某导管架平台为例,针对不同的结构损伤模式,进一步探讨了结构的冗余度,计算求解结构鲁棒性参数,并通过剩余影响系数(RIF)评估了平台鲁棒性。研究结果表明,腿杆件、水平杆件以及斜杆件三种损伤失效模式中,损伤平台的结构鲁棒性由高到低依次为:水平杆件损伤失效、斜杆件损伤失效及腿杆件损伤失效。RIF可以用来识别结构杆件的重要性,从而为平台结构设计或定期检测提供重要参考。

Robustness is one of the key factors for offshore structural safety.As the main facility for the exploration and development of offshore oil and gas resources,abundant structural robustness should be considered in the design phase for jacket platforms.In this paper,a structural robustness approach based on nonlinear Pushover theory for jacket platform is proposed,in which the evaluation index of structural robustness is determined,and the process of jacket structural robustness assessment is established.Taking a jacket platform in East China Sea as an example,according to different structural damage modes,the redundancy of the structure is further discussed,the structural robustness parameters are calculated,and the platform robustness is evaluated by the residual influence coefficient(RIF).The results show that among three damage failure modes,the structural robustness of the damage platform sorted descending is horizontal members damage mode,diagonal members damage mode,and leg members damage mode.RIF can be applied for identifying the importance of structural members,thus providing an important reference for platform structure design or regular inspection.