复合结构罐顶安全性数值模拟及结构优化

Safety Numerical Simulation and Structural Optimization of Composite Tank Roof

传统玻璃钢储罐罐顶质量大,稳定性差。出于减重和增加罐顶稳定性的目的设计了含夹芯结构的新型纤维增强复合结构罐顶。由于复合结构罐顶受力复杂且缺少相关的设计和校核标准,因此以直径为11 m的立式储罐罐顶为例,采用ANSYS有限元分析方法,对根据HG/T 20696-2018标准设计的纤维增强复合结构罐顶进行安全性分析,根据安全系数求解罐顶设计的最小厚度和最小质量,并根据分析结果对罐顶进行结构优化。研究结果表明:HG/T 20696-2018标准无法适用于复合结构罐顶的设计;相比于该标准设计下的复合结构罐顶,加入加强筋前的罐顶厚度可再减少12%,质量再减少10%,而采用加强筋后,罐顶厚度可减少42%,罐顶质量可减少40%;加强筋下沿区域应力集中明显,为首要失效位置。所得结论可为纤维增强复合结构罐顶的设计和改进提供指导。

The traditional glass fiber reinforced plastic tank has high roof weight and poor stability.In order to reduce the weight and increase the stability of the tank roof,a new type of fiber reinforced composite structure tank roof with sandwich structure was designed.Due to the complex force on the roof of the composite structure tank and the lack of relevant design and verification standards,the roof of the vertical storage tank with a diameter of 11 m was taken as an example,and the ANSYS finite element analysis method was used to conduct safety analysis on the roof of the fiber reinforced composite structure tank designed with HG/T 20696-2018 standard and solve the minimum thickness and minimum mass of the tank roof design according to the safety factor.According to the analysis results,the structure of the tank top was optimized.The results show that HG/T 20696-2018 standard is not suitable for the design of composite structure tank roof.Compared with the composite structure tank top under the standard design,the thickness of the tank top can be reduced by 12%and the mass can be reduced by 10%before adding the reinforcing bars,while the thickness of the tank top can be reduced by 42%and the mass of the tank top can be reduced by 40%after using the reinforcing bars.The stress concentration is obvious along the area under the reinforcement,which is the primary failure position.The conclusion can provide guidance for the design and improvement of fiber-reinforced composite tank roof.