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A Study on the Structural Response of a PSC Inner Containment Dome with Large Openings Due to Prestress Transfer

机译:预应力传递作用下大开口PSC内含圆顶的结构响应研究

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A linear three dimensional finite element (FE) study has been carried out to examine the structural response of a prestressed concrete (PSC) inner containment (IC) dome of reactor building (double containment system) of a typical Indian Nuclear Power Plant, having large steam generator (SG) openings with due emphasis on the local behaviour of the steel-concrete interfaces at the SG openings, due to initial prestress transfer. The predominant thrust of the study has been placed on the objective of predicting the possibilities of separation at the steel-concrete interface zones adjacent to the embedded plates (EPs) of the SG openings. Two types of modeling and analysis have been made to study the overall and local behaviour of the structure. Prestressing ducts, passive reinforcements and EPs have been included in the models in certain ways. For the FE analysis, the interface zone has been modeled using interface elements, the properties of which were derived from the results of past experiments conducted on steel plate-concrete inter-face specimens. The FE analysis results have been compared with the results of the past two FE analytical studies on the linear behaviour of the same PSC IC dome. Important observations have been made regarding dome deformation and stresses throughout the structure with special emphasis on the local behaviour of steel-concrete interfaces at and around the SG openings.
机译:进行了线性三维有限元(FE)研究,以检查具有典型大型印度核电站的反应堆建筑物(双安全壳系统)的预应力混凝土(PSC)内部安全壳(IC)穹顶的结构响应蒸汽发生器(SG)开口,由于初始预应力传递,因此应特别注意SG开口处钢-混凝土界面的局部行为。这项研究的主要推力已用于预测与SG开口的预埋板(EP)相邻的钢混凝土界面区域分离的可能性。进行了两种类型的建模和分析,以研究结构的整体和局部行为。模型中包括预应力管道,被动钢筋和EP。对于有限元分析,已经使用界面元素对界面区域进行了建模,界面元素的性质是根据​​过去在钢板混凝土界面试样上进行的实验得出的结果得出的。有限元分析结果已与过去两个有限元分析研究相同的PSC IC球顶的线性行为的结果进行了比较。对于整个结构的拱顶变形和应力,已经进行了重要的观察,特别强调了SG开口处和周围的钢混凝土界面的局部行为。

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