摘要
目的研究构件在工程中不确定性因素及服役期内结构可靠度指标值的变化,预测腐蚀影响的H型钢梁结构的使用寿命.方法结合已有的腐蚀钢材试验数据和研究成果,提出基于蒙特卡洛方法与Weibull模型相结合的方法,对腐蚀前后H型钢梁进行可靠度分析.即首先利用蒙特卡洛方法对不同腐蚀时间的H型钢梁进行可靠度分析,然后利用Weibull模型对不同腐蚀时间的H型钢梁的可靠度进行拟合,从而得到预测H型钢梁的可靠指标的衰减模型,并结合构件的目标可靠指标,预测H型钢梁的寿命.最后通过一数值算例验证所提方法的有效性.结果 Weibull模型可以很好的对腐蚀的H型钢梁的可靠指标进行拟合以及预测;依据腐蚀影响的H型钢梁的可靠指标衰减模型,得到该H型钢梁的使用年限为27.18 a.结论所提出的方法能够预测腐蚀的H型钢梁寿命,验证了所提方法的可行性和有效性.
This paper focused on the develop trend of reliability index of members considering the uncertain factors in future service period,and in the effort to predict lifetime of H-shaped steel beam with corrosion. This paper proposed a method that uses M onte Carlo method and Weibull model to calculate the reliability prognosis of H-shaped steel beam with corrosion on existing test data and research results. M ore specifically,the M onte Carlo method was firstly used to calculate the reliability of corroded H-shaped steel beam in different corrosion time; simultaneously,Weibull model was utilized to fit the forecast curve of reliability; the proposed forecast curve was then used to predict lifetime of H-shaped steel beam based on the set structural reliability; finally,a numerical example was conducted to verify the effectiveness of the proposed method. The results showedthat： Weibull model was able to effectively simulate and predict the reliability index of corroded Hshaped steel beam; according to the reliability index attenuation model of corroded H-shaped steel beam,the lifetime of H-shaped steel beam with corrosion in this paper was 27. 18 year. Consequently,the proposed method can predict the lifetime of H-shaped steel beam with corrosion,therefore the feasibility and effectiveness of this proposed method was proved.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2016年第2期193-199,共7页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51278127)
国家十二五科技支撑计划项目(2015BAK14B02)
闽江学者特聘教授奖励计划项目
