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大型原油储罐多为非锚固变壁厚结构,在液压作用下,地基沉降会引起底板边缘板翘曲及壁厚变化处的应力波动等复杂现象。为了研究大型储罐受载后各圈壁板、底板的应力大小及其分布规律,采用电阻应变测量技术对水压试验中10×10~4 m~3的外浮顶原油储罐(直径80 m、罐高21.8 m)进行现场应力测试,得到储罐底板及壁板的应力数据,分析储罐关键部位的应力水平、分布特征及其原因。结果表明:在最高液位下,储罐底板主要表现为径向弯曲应力;储罐壁板根部主要为轴向弯曲应力,随测点高度升高,罐壁在水压作用下发生膨胀变形,主要表现为环向薄膜应力。该研究结果为储罐运行的安全评定提供了参考依据。
Most large crude oil storage tanks are non-anchored variable wall structures. Under the action of hydraulic pressure, settlement of foundation can cause complex phenomena such as warping of the edge plate of the bottom plate and stress fluctuation at the change of wall thickness. In order to study the stress and the distribution of wall and floor slab after the large tank was loaded, the resistivity and strain measurement technology was used to measure the pressure drop of 10 × 10 ~ 4 m ~ 3 outer floating roof crude oil storage tank (diameter 80 m, tank height 21.8 m) to get the stress data of tank bottom and wall, analyze the stress level, distribution characteristics and reasons of the key parts of the tank. The results show that under the highest liquid level, the tank bottom mainly shows radial bending stress. The root of the tank wall is mainly axial bending stress. With the height of the measuring point increasing, the tank wall expands and deforms under the action of water pressure, Mainly for the ring membrane stress. The results of this study provide a reference for the safety assessment of tank operation.