大型LNG储罐预应力混凝土外墙应力分析与结构优化
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摘要
大型LNG储罐的外墙一般由预应力混凝土建造,其应力分布和变形比较复杂,目前国内对这方面的研究较少。提出了储罐外墙纵向预应力筋向外最大偏移量的控制方程,以及环形压力容器最大环向应力位置的计算方法,推导出纵向预应力筋偏移后距罐内侧最大距离的控制方程和最大环向应力位置的计算方程,并根据边界条件,给出计算方程参数的方程组,在此基础上提出纵向预应力筋向外偏移、局部增设环向预应力筋的结构优化方法,并应用ADINA有限元软件,进行数值模拟。通过理论计算与数值模拟结果的对比分析,验证了理论公式推导的正确性以及结构优化方法的合理性,可为以后国内LNG储罐的自主设计与建造提供理论依据。
The exterior wall of large-scale LNG storage tank is generally formed from pre-stressed concrete,and its stress distribution and deformation are relatively complicated,thus only a small number of relevant studies are found in China.This paper proposes the control equation for the maximum offset of longitude pre-stressed reinforcement of tank's exterior wall towards outside and the computation for the position of maximum hoops stress of ring-shape pressure containers in order to obtain the control equation and stress location computation for the maximum distance of shifted longitude pre-stressed reinforcement from the inside of tank.Further,it offers equations to relevant parameters based on the border conditions and brings forward the structural optimizations for shifted longitude pre-stressed reinforcement towards outside and partially-established ring-shape pre-stressed reinforcement thereafter.Numerical simulation is carried out with ADINA finite element software and validates the derivation correctness with theoretical formula and reasonability of structural optimization via comparative analysis between the theoretical computation and numerical simulation results,which provides a theoretical foundation for the design and construction of domestic LNG storage tank.
The exterior wall of large-scale LNG storage tank is generally formed from pre-stressed concrete,and its stress distribution and deformation are relatively complicated,thus only a small number of relevant studies are found in China.This paper proposes the control equation for the maximum offset of longitude pre-stressed reinforcement of tank's exterior wall towards outside and the computation for the position of maximum hoops stress of ring-shape pressure containers in order to obtain the control equation and stress location computation for the maximum distance of shifted longitude pre-stressed reinforcement from the inside of tank.Further,it offers equations to relevant parameters based on the border conditions and brings forward the structural optimizations for shifted longitude pre-stressed reinforcement towards outside and partially-established ring-shape pre-stressed reinforcement thereafter.Numerical simulation is carried out with ADINA finite element software and validates the derivation correctness with theoretical formula and reasonability of structural optimization via comparative analysis between the theoretical computation and numerical simulation results,which provides a theoretical foundation for the design and construction of domestic LNG storage tank.
引文
BS7777-1993Flat-bottomed,vertical,cylindrical storage tanks for low temperature service[S].1993.[1]
张彬.预应力LNG储罐混凝土外墙地震响应分析[D].大庆:大庆石油学院,2009.[2]
王伟玲.大型LNG预应力储罐静力荷载下受力性能研究[D].大庆:大庆石油学院,2009.[3]
柳山.液化天然气(LNG)全容储罐结构和性能研究[D].广州:华南理工大学,2009.[4]
帅健.管道及储罐强度设计[M].北京:石油工业出版社,2006:190-194.[5]
张彬.预应力LNG储罐混凝土外墙地震响应分析[D].大庆:大庆石油学院,2009.[2]
王伟玲.大型LNG预应力储罐静力荷载下受力性能研究[D].大庆:大庆石油学院,2009.[3]
柳山.液化天然气(LNG)全容储罐结构和性能研究[D].广州:华南理工大学,2009.[4]
帅健.管道及储罐强度设计[M].北京:石油工业出版社,2006:190-194.[5]
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