【摘要】：為研究海工混凝土結(jié)構(gòu)耐久性設(shè)計(jì)及壽命預(yù)測的可靠度方法,分析了耐久性設(shè)計(jì)與壽命預(yù)測的半理論、半經(jīng)驗(yàn)解析模型方法,討論了截面形狀等條件對氯離子擴(kuò)散傳輸?shù)挠绊憽Ｔ撐难芯繎?yīng)用有限體積法(FVM)分析求解混凝土中氯離子含量和蒙特卡羅(Monte Carlo)模擬求解耐久失效概率,分析海工混凝土結(jié)構(gòu)耐久可靠度。這種方法可簡稱FVM-MC方法。在FVM-MC方法中,首先采用FVM方法求解混凝土中的氯離子含量,然后采用Monte Carlo方法對失效概率進(jìn)行模擬求解。驗(yàn)證分析表明,FVM-MC方法分析模擬精度高,是海工混凝土結(jié)構(gòu)可靠度分析的一種可靠方法。計(jì)算結(jié)果表明,截面形狀等對混凝土結(jié)構(gòu)的耐久可靠度具有顯著的影響,采用Fick第二定律解析解的半理論、半經(jīng)驗(yàn)?zāi)Ｐ?由于沒有考慮截面形狀效應(yīng),增加了矩形截面構(gòu)件的耐久失效風(fēng)險(xiǎn);圓形截面具有近似一維的擴(kuò)散傳輸特點(diǎn),在條件相同情況下,其構(gòu)件耐久可靠度顯著地高于方形或矩形截面的構(gòu)件。
[Abstract]:In order to study the reliability method of durability design and life prediction of marine concrete structures, the semi-theory and semi-empirical analytical model of durability design and life prediction are analyzed, and the influence of cross-section shape on chloride ion diffusion transfer is discussed. In this paper, the finite volume method (FVM) analysis is used to solve the chloride ion content in concrete and Monte Carlo (Monte Carlo) simulation is used to solve the durable failure probability, and the durability reliability of marine concrete structure is analyzed. This method can be abbreviated as the FVM-MC method. In the FVM-MC method, the FVM method is first used to solve the chloride ion content in concrete, and then the failure probability is simulated by the Monte Carlo method. The verification and analysis show that the FVM-MC method is a reliable method for reliability analysis of marine concrete structures because of its high simulation accuracy. The results show that the shape of the section has a significant effect on the durability reliability of concrete structures. The semi-theoretical and semi-empirical model of the analytical solution of Fick's second law is adopted because the shape effect of the section is not taken into account. The risk of durability failure of rectangular cross-section members is increased. Under the same conditions, the durability reliability of the circular section is significantly higher than that of the square or rectangular section.
【作者單位】： 煙臺大學(xué)土木學(xué)院;清華大學(xué)土木系;
【基金】：國家科技支撐計(jì)劃課題-跨海集群工程混凝土結(jié)構(gòu)120年使用壽命關(guān)鍵技術(shù)項(xiàng)目(2011BAG07B04)
【分類號】：TU375
，

本文編號：2436776