基于弹性模量缩减法的钢衬钢筋混凝土压力管道极限承载力计算

摘要

According to configuration and bearing mechanism of steel lined reinforced concrete penstocks ( SLRCP) , a new ultimate bearing capacity analysis method for SLRCP is proposed based on the elastic modulus reduction method. In this new method, the variable cross section arch model and elasticity centre method are employed in the internal force analysis of SLRCP, and an expression for element bearing ratio which characterizes the bearing condition of the corresponding section is given. Case study shows that the structural damage evolution process can be simulated by the elastic iteration process of the method, and then the ultimate bearing capacity of SLRCP can be obtained with combination of the limit analysis theorem. It also proves the simplicity and practicality of the new method, and the ultimate bearing capacity of SLRCP can be obtained by this method accurately and efficiently.%针对钢衬钢筋混凝土压力管道( SLRCP)的体形和承载特性，在弹性模量缩减法基础上引入变截面拱和弹性中心法，建立了表征管道结构截面承载状态的单元承载比表达式，提出了SLRCP极限承载力分析的新方法。实例计算结果表明，该计算方法可通过弹性迭代模拟结构损伤演化过程，进而结合极限分析定理得出管道结构的极限承载力，具有原理简单和应用方便的特点，能够准确高效地求解SLRCP的极限承载力。