摘要
[目的]广东省是台风多发地区,但是目前无论是海上风机支撑结构设计国际标准还是我国即将发布的规范都没有明确考虑台风的影响,目标可靠度(失效概率)是未知的。另外,我国规范对不同荷载采用了不同的分项系数,不便于一体化设计的实施。[方法]比较了即将发布的海上风机基础设计规范和国际标准的异同,并分析了在不同荷载效应变异系数、效应比和相关系数的情况下我国规范的目标可靠度,以及基于给定的目标可靠度,计算分项系数在上述不同情况下的取值选择。最后,给出了计算等价单一荷载效应分项系数的方法。[结果]结果表明:相同的分项系数和组合系数在不同的情况下目标可靠度变化较大,随着变异系数从0.2增大到0.6,可靠度指标将降低0.5~1.0。[结论]建议根据《工程结构可靠性设计统一标准》选择3.2为目标可靠度,分项系数和组合系数根据当地不同的环境条件确定。
[Introduction]Guangdong province is a typhoon-prone area,but neither the international offshore wind engineering design standards nor the Chinese design codes which to be issued consider the influence of typhoon. The objective reliability index（ failure probability） remains unknown. Moreover,the partial safety factors（ PSFs） for different loads in Chinese design codes are different,which will be an obstacle for the integrated design of offshore wind turbines. [Method]In this study,the authors compared the Chinese design codes with the international standards and calculated the objective reliability index of the codes and the corresponding modified PSFs under different coefficients of variance,ratios and correlation coefficients of load effects. And the authors also gave the method to obtain the equivalent unified PSF. [Result]The results showthat using the same PSFs and combination factors,the reliability index will decreases by 0. 5 - 1. 0 when the coefficient of variation of loads increases from 0. 2 to 0. 6. [Conclusion]The authors suggests the reliability index of 3. 2 and the PSFs and combination factor are determined by the site condition.
作者
林敬华
裴爱国
马兆荣
LIN Jinghua;PEI Aiguo;MA Zhaorong(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,China)
出处
《南方能源建设》
2018年第2期77-85,共9页
Southern Energy Construction
基金
中国能建广东院科技项目"海上风力发电机组支撑结构一体化优化设计及极限承载力可靠性分析"(EV04311W)
关键词
海上风电
结构可靠度
台风
offshore wind engineering
structural reliability
typhoon
