Failure Rate of Empty and Fluid-Filled Concrete Pipes under High Strain Rates

International Journal of Advanced Structural Engineering

دوره 12، شماره 3، آبان 2022   

نوع مقاله: Original Article

شناسه دیجیتال (DOI): 10.30495/ijase.2023.1987393.1070

نویسندگان

Asadollah Ranjbar Karkanaki^{* 1}؛ Mohsen Parviz²؛ Alireza Darvishpour³؛ Mahyar Taheri⁴

¹Department of Civil Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran

²Structural Engineering, Iranian Academic Center for Education, Culture and Research (ACECR), Bushehr Branch, Iran.

³Department of Civil Engineering, Robatkarim Branch, Islamic Azad University, Robatkarim, Iran.

⁴Ph.D student, Depart, of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, USA.

چکیده

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.

کلیدواژه‌ها

Model failure؛ Concrete pipes؛ Strain rate؛ Lagrangian-Eulerian Method؛ LS-DYNA