安全壳混凝土徐变试验和预应力梁试验数据集

核电站安全壳是核反应堆的重要外围防护结构，是抵抗失水事故的最后一道物理屏障，其中预应力体系是保证安全壳结构完整性的重要组成部分。目前中国在运和在建的商用机组绝大部分为预应力混凝土安全壳结构，主要采用孔道灌浆的有粘结预应力体系。该体系存在无法定期监测预应力钢束的实际力值水平，也无法确定水泥浆对预应力钢束保护的有效性。安全壳在服役过程中经受环境侵蚀、材料老化、荷载长期效应等因素的耦合作用，其结构和预应力系统不可避免地发生损伤累积和抗力衰减。如何准确评价和预测有粘结预应力结构中预应力损失时变值，是预应力混凝土安全壳结构面临的一项技术难题。本项目开展了安全壳结构预应力时限损失试验和数值模拟研究，设计研发了混凝土多轴徐变试验装置，采用Data Taker DT85数据采集仪器获得了2022~2023年近一年的混凝土双轴徐变数据和2021~2023年近一年半的预应力混凝土梁试验数据；基于提出的预测模型，采用有限元分析方法，计算了一年半时长下的预应力损失数据，并与实验值进行对比，模型预测准确性的相关系数（R2）最小值为0.894，最大值为0.958。本数据集揭示了安全壳结构预应力损失时变规律，可用于核电厂安全壳结构预应力评估与预测，为安全壳结构服役状态评价提供科学依据

The containment structure of a nuclear power plant is an important peripheral protective structure for nuclear reactors, serving as the final physical barrier against loss-of-coolant accidents (LOCA). The prestressing system is a critical component ensuring the structural integrity of the containment. At present, the vast majority of commercial nuclear units in operation and under construction in China adopt prestressed concrete containment structures, which mainly use bonded prestressing systems with duct grouting. However, this system has limitations: it cannot regularly monitor the actual tension force level of prestressing tendons, nor can it validate the effectiveness of cement grout in protecting these tendons. During its service life, the containment structure is subjected to coupled effects such as environmental erosion, material aging and long-term load effects, leading to inevitable cumulative damage and resistance degradation of its structure and prestressing system. Accurately evaluating and predicting the time-varying prestress loss in bonded prestressed structures is a technical challenge faced by prestressed concrete containment structures.

This project conducted experimental and numerical simulation studies on time-dependent prestress loss of containment structures. A multi-axial creep testing apparatus for concrete was designed and developed. The Data Taker DT85 data acquisition instrument was used to collect nearly one year of concrete biaxial creep data from 2022 to 2023, and nearly one and a half years of prestressed concrete beam test data from 2021 to 2023. Based on the proposed prediction model and using finite element analysis (FEA), prestress loss data over a one-and-a-half-year period was calculated and compared with experimental values. The minimum and maximum correlation coefficients (R²) of the model's prediction accuracy are 0.894 and 0.958, respectively.

This dataset reveals the time-varying law of prestress loss in containment structures, which can be used for prestress assessment and prediction of nuclear power plant containment structures, providing scientific basis for the evaluation of the service status of containment structures.

搜集汇总

背景与挑战

背景概述

该数据集聚焦核电站安全壳预应力混凝土结构，针对有粘结预应力体系无法监测钢束力值和评估保护有效性的技术难题，提供了2022-2023年的混凝土双轴徐变试验数据和2021-2023年的预应力梁试验数据，通过有限元分析预测预应力损失，模型准确性高（R2最小0.894，最大0.958），可用于安全壳结构服役状态评估与预测。