Research on Numerical Simulation Method for Crack Width in Reinforced Concrete Linings of Hydropower High-pressure Tunnels
The maximum crack width is commonly used as a design control criterion for reinforced concrete linings in high-pressure hydraulic tunnels.However,when calculating the maximum crack width for large-diameter and high-head tunnels,formula-based methods have certain limitations.Many experts and scholars have attempted to apply numerical simulation methods to calculate the crack width of linings,but it is difficult to comprehensively consider multiple factors such as the bond-slip between reinforced concrete and stress redistribution after cracking.In view to this,a method is proposed to simulate crack characteristics by arranging virtual crack elements guided by a damage model.Specifically,a concrete damage model considering bond-slip is used to simulate the process of concrete damage development under the combined action of reinforcement and concrete as the load is applied.Furthermore,virtual crack elements are added in areas with concentrated damage to calculate the crack propagation process.Upon comparison,the maximum width,development patterns and distribution of cracks obtained by this method are similar to existing literature,and the calculation convergence is good.This method achieves direct,accurate and efficient determination of lining crack widths through finite element algorithms,which has significant application value in design and operational safety prediction.
hydropower high-pressure tunnelreinforced concrete liningcrack widthbond-slipvirtual crackdamage model
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