本文選題：混凝土　切入點：壽命預(yù)測　出處：《建筑材料學(xué)報》2017年02期 　論文類型：期刊論文

【摘要】：針對基礎(chǔ)工程中混凝土結(jié)構(gòu)在現(xiàn)場暴露環(huán)境下的壽命預(yù)測問題,提出了1種基于Copula函數(shù)的多退化因素剩余壽命預(yù)測方法.先選取質(zhì)量損失和超聲聲速作為關(guān)鍵退化因素,針對其不同退化軌跡,對實際采集數(shù)據(jù)進(jìn)行退化建模,得到混凝土剩余壽命的邊緣分布函數(shù);再通過Copula函數(shù)建立各退化因素間的相關(guān)關(guān)系,將混凝土剩余壽命的邊緣分布進(jìn)行融合,得到其聯(lián)合分布函數(shù).結(jié)果表明:選擇質(zhì)量損失和超聲聲速這2個退化因素有助于建立混凝土在現(xiàn)場暴露環(huán)境下的退化模型,并得到其剩余壽命的邊緣分布函數(shù);基于Copula函數(shù)預(yù)測西寧市現(xiàn)場暴露環(huán)境下的混凝土使用壽命約225個月,損傷發(fā)展始于第180個月左右.
[Abstract]:Aiming at the problem of life prediction of concrete structures in field exposed environment in foundation engineering, a method of residual life prediction with multiple degradation factors based on Copula function is proposed. Mass loss and ultrasonic velocity are selected as the key degradation factors. According to the different degradation trajectories, the degradation modeling of the actual collected data is carried out, and the edge distribution function of the residual life of concrete is obtained, and the correlation among the degradation factors is established by the Copula function. The edge distribution of the residual life of concrete is fused and the joint distribution function is obtained. The results show that the selection of two degradation factors, mass loss and ultrasonic velocity, is helpful to establish the degradation model of concrete in the field exposed environment. The edge distribution function of its residual life is obtained, and the service life of concrete in Xining exposed environment is predicted by Copula function, and the damage development begins at about 180 months.
【作者單位】： 蘭州理工大學(xué)甘肅省土木工程防災(zāi)減災(zāi)重點實驗室;蘭州理工大學(xué)西部土木工程防災(zāi)減災(zāi)教育部工程研究中心;
【基金】：國家自然科學(xué)基金資助項目(51168031,51468039)
【分類號】：TU528.01

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本文編號：1641009