Abstract

Recently, explosions, collisions, and fires have occurred frequently around the world due to terror attacks, and impact accidents. Particularly, since the 9.11 terror attack, public anxiety heightened due to lack of safety in our society. The incidents can be viewed as examples of possible extreme loading scenarios that can occur in structures and infrastructures. Among all of structures and infrastructures, prestressed concrete containment vessels (PCCVs) are the most vulnerable structures from terrors and accidents. Therefore, in this study, finite element software LS-DYNA and MIDAS FEA, are used to evaluate of PCCVs applied with blast induced fire loading resistance. Since the blast test on a full-scale PCCV is not realistically possible, it is necessary to develop a precise simulation tool to accurately evaluate the damage level of a full-scale PCCV. This study aims to improve the accuracy of the simulation tool by calibrating numerical software using experimental test data. Then, the parametric study is conducted according to the explosive charge weight, standoff distance, and concrete compressive strength of a PCCV using calibrated blast and fire simulation tools. Based on the study results, the level of damage assessment to PCCVs applied with blast-fire loading can be precisely evaluated.

摘要

近期，由于恐怖袭击和撞击事故，世界各地频繁发生爆炸、碰撞和火灾。特别是自9.11恐怖袭击以来，由于社会缺乏安全感，公众的焦虑情绪加剧。这些事故可被视为可能发生在结构和基础设施中的极端负载情况的示例。在所有结构和基础设施中，预应力混凝土安全壳 (PCCV) 是最容易受到恐怖和事故影响的结构。因此，在本研究中，有限元软件 LS-DYNA 和 MIDAS FEA 被用于评估 PCCVs 的爆炸诱发火灾载荷阻力。由于在全尺寸 PCCV 上进行爆炸试验实际上是不可能的，有必要开发一种精确的仿真工具来准确评估全尺寸 PCCV 的损坏程度。本研究旨在通过使用实验测试数据校准数值软件来提高模拟工具的准确性。然后，使用经过校准的爆炸和火灾模拟工具，根据 PCCV 的炸药重量、间隔距离和混凝土抗压强度进行参数研究。根据研究结果，可以精确评估施加爆炸火载荷的 PCCV 的损坏评估水平。使用校准的爆炸和火灾模拟工具计算 PCCV 的混凝土抗压强度。根据研究结果，可以精确评估施加爆炸火载荷的 PCCV 的损坏评估水平。使用校准的爆炸和火灾模拟工具计算 PCCV 的混凝土抗压强度。根据研究结果，可以精确评估施加爆炸火载荷的 PCCV 的损坏评估水平。