Abstract

Following the damage to infrastructure systems in the 2011 Tohoku earthquake, a new seismic design concept named the anti-catastrophe concept in seismic design framework was proposed for the resilience of infrastructure. It states that seismic damage to infrastructure could shift discontinuously from a normal to a severe level, which we refer to as the ‘phase transition’ of infrastructure damage. In this article, damage to a peripheral lifeline system involving buried pipes for water distribution and sewerage, and power distribution equipment was analysed surveying statistical damage data in the 2011 Tohoku earthquake. It was observed that the damage to the peripheral lifeline systems went beyond the assumption made under the previous damage measures using a relatively lower and moderate seismic intensity at which the degree of the damage became rapidly serious, thereby representing the threshold to the phase transition of infrastructure performance. Further, preferable seismic disaster response with the reduction of the ‘large uncertainty of the impact’ of the phase transition of infrastructure damage was discussed. Based on the discussion, implications for the resilience of peripheral lifeline systems were derived. The anti-catastrophe concept for the seismic design was introduced and conditions for the implementation of such design concept were summarised.

抽象的

继2011年东北地震对基础设施系统造成破坏之后，提出了一种新的抗震设计概念，即抗震设计框架中的抗大灾概念，以增强基础设施的弹性。它指出，对基础设施的地震破坏可能会不连续地从正常水平转变为严重水平，我们将其称为基础设施破坏的“相变”。在本文中，通过调查2011年东北地震的统计损坏数据，分析了涉及用于供水和排污的地下管道和配电设备的外围生命线系统的损坏。据观察，对外围生命线系统的破坏超出了先前采用相对较低和中等地震强度的破坏措施所做出的假设，在该地震强度下破坏程度迅速变得严重，从而代表了基础设施阶段过渡的门槛表现。此外，还讨论了较好的地震灾难响应，同时减少了基础设施破坏的相变的“影响的较大不确定性”。在讨论的基础上，得出了对外围生命线系统弹性的影响。介绍了抗震设计的抗灾概念，并总结了实施该抗震设计的条件。此外，还讨论了较好的地震灾难响应，同时减少了基础设施破坏的相变的“影响的较大不确定性”。在讨论的基础上，得出了对外围生命线系统弹性的影响。介绍了抗震设计的抗灾概念，并总结了实施该抗震设计的条件。此外，还讨论了较好的地震灾难响应，同时减少了基础设施破坏的相变的“影响的较大不确定性”。在讨论的基础上，得出了对外围生命线系统弹性的影响。介绍了抗震设计的抗灾概念，并总结了实施该抗震设计的条件。