| Simulation of Airblast Load and Its Effect on RC Structures |
| |
| 作者姓名： | GONG Shunfeng LU Yong JIN Weiliang |
| |
| 作者单位： | College of Civil and Architectural Engineering，Zhejiang University，Hangzhou 310027，China; School of Civil and Environmental Engineering，Nanyang Technological University，Singapore 639798 |
| |
| 摘 要： | In the analysis of a structure subjected to an explosion event, the determination of the blast load constitutes a crucial step. The effect of the blast load on the structure depends not only on the peak shock overpressure, but also the impulse (hence the duration). For structures with a regular geometry, the blast load may be fairly well estimated using appropriate empirical formulae; however, for more complex situations, a direct simulation using appropriate computational techniques is necessary. This paper presents a numerical simulation study on the prediction of the blast load in free air using a hydrocode, with focus on the sensitivity of the simulated blast load to the mesh grid size. The simulation results are compared with empirical predictions. It is found that the simulated blast load is sensitive to the mesh size, especially in the close-in range, and with a practically affordable mesh grid density, the blast load tends to be systematically underestimated. The study is extended to internal blast cases. An example concrete slab under internal explosion is analyzed using a coupled analysis scheme. The internal blast load from the simulation is examined and the response of the RC slab is commented.
|
Simulation of Airblast Load and Its Effect on RC Structures |
| |
| GONG Shunfeng,LU Yong,JIN Weiliang.Simulation of Airblast Load and Its Effect on RC Structures[J].Transactions of Tianjin University,2006,12(Z1). |
| |
| Authors: | GONG Shunfeng LU Yong JIN Weiliang |
| |
| Abstract: | In the analysis of a structure subjected to an explosion event, the determination of the blast load constitutes a crucial step. The effect of the blast load on the structure depends not only on the peak shock overpressure, but also the impulse (hence the duration). For structures with a regular geometry, the blast load may be fairly well estimated using appropriate empirical formulae; however, for more complex situations, a direct simulation using appropriate computational techniques is necessary. This paper presents a numerical simulation study on the prediction of the blast load in free air using a hydrocode, with focus on the sensitivity of the simulated blast load to the mesh grid size. The simulation results are compared with empirical predictions. It is found that the simulated blast load is sensitive to the mesh size, especially in the close-in range, and with a practically affordable mesh grid density, the blast load tends to be systematically underestimated. The study is extended to internal blast cases. An example concrete slab under internal explosion is analyzed using a coupled analysis scheme. The internal blast load from the simulation is examined and the response of the RC slab is commented. |
| |
| Keywords: | air blast shock wave peak overpressure impulse numerical simulation RC slab |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
