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    List of Articles Asadollah Ranjbar Karkanaki


  • Article

    1 - Numerical investigation of settlement effect caused by tunneling on surface structures based on pile group
    International Journal of Advanced Structural Engineering , Issue 5 , Year , Autumn 2023
    In this study, an attempt has been made to investigate the effect of various factors on the super structures by modeling the structures based on the pile group and its interaction with urban tunnels. The effect of various parameters such as the presence of pile group, t More
    In this study, an attempt has been made to investigate the effect of various factors on the super structures by modeling the structures based on the pile group and its interaction with urban tunnels. The effect of various parameters such as the presence of pile group, the horizontal distance of the center of the tunnel from the center of the foundation, the vertical distance of the tunnel to the tip of the piles, the length of the piles and the height of the super structure on the tunnel-soil-structure interaction has been investigated. Based on the analysis, it was observed that the placement of the pile group in the substructure will lead to the reduction of settlement caused by tunneling in the superstructure. From the point of view of the horizontal distance of the tunnel from the center of the superstructure.The location of the structure in the critical range of the tunnel, which includes two lines with the internal friction angle of the soil relative to the vertical, the structure has the greatest impact from tunneling The increase in the length of the piles due to the change in the axial force of the piles increases the period of the foundation and vice versa reduces the settlement of the structure. In general, the side piles in the pile group are less affected by tunneling, but the central pile suffers a significant decrease in axial force. Manuscript profile

  • Article

    2 - Failure Rate of Empty and Fluid-Filled Concrete Pipes under High Strain Rates
    International Journal of Advanced Structural Engineering , Issue 4 , Year , Summer 2022
    Considering the importance of the performance of buried concrete pipes under external loads and the role played by concrete specifications and pipe thickness in this regard, the current study analyzed the failure rate and response of concrete pipes buried in three types More
    Considering the importance of the performance of buried concrete pipes under external loads and the role played by concrete specifications and pipe thickness in this regard, the current study analyzed the failure rate and response of concrete pipes buried in three types of soil to a TNT blast load using the Lagrangian-Eulerian method in the nonlinear dynamics software LS-DYNA. The results show that the presence of fluid in the pipe generates an internal pressure, which reduces the deformation of the pipe under the blast load. It was also found that the higher the P-crush of the concrete pipe, the smaller the strain and displacement generated under the blast pressure. In thicker pipes, sometimes the damage is limited to the outer sections of the shell, and the pipe remains usable. However, in thinner pipes, damage often affects both inner and outer surfaces of the shell, rendering the pipe unusable. The plastic strain generated in Specimen 1 in Soil Type 1 is 85% higher than the acceptable plastic strain of the concrete pipe. Moreover, this value is 87% for Soil Type 2 and 85% for Soil Type 3. Manuscript profile