Takeshi Koike

Risk Analysis of Power Supply in San Juan, Surigao City, Philippines Due to Extreme Floods

The power supply system and its network components, like any other lifeline, are at risk due to extreme floods. Although various adaptive measures by the power producer can reduce this risk, the infrastructure (demand side) connected to the substation are still at risk to extreme inundation primarily because of its elevation, thus rendering the adaptation measures inadequate. In this paper, the authors use geographic information technology to quantify the risk of power loss to the consumers and the ensuing economic loss to the power producer considering various extreme inundation events. These extreme flood events were based on hypothetical rainfall with return periods of 2, 5, 10, 25 and 50 years. Specifically, the authors developed a risk curve for the power supply system in barangay San Juan, Surigao City, Surigao Del Norte, Philippines. The study shows that the percentage of households vulnerable to extreme floods for each return period are 22, 91, 93, 94 and 96. This power outage translates to a potential money loss range from US

SEISMIC INVESTMENT OF A DETRIORATED INDUSTRIAL WATER PIPELINE FOR BCP

1800 to US

SEISMIC DESIGN OF REINFORCING PILES FOR AN EXISTING BRIDGE PIER

36,000 for the power provider. To reduce the risk the following adaptation measures can be adopted by the local government (a) improve the drainage system, (b) rehabilitate Surigao River and consider buffer zone / overflow structures, (c) proper zoning and relocation of flood residents to elevated areas and (d) install new transformers to isolate households that are frequently flooded so power outage is reduced during extreme events.

Ground strain estimation for lifeline earthquake engineering

本論文は,既設工業用水パイプラインシステムの地震防災投資について性能設計の観点から事業利害関係者（Stakeholders）である利用者，事業運営者，設計者・施工者間で合意形成されるべき目標性能値の決定法ならびに最適な地震防災投資の在り方について論述したものである．利用者である企業はBCP（事業継続計画）の観点から地震時要求性能の実現を要請し，事業運営者である水道事業体は施設の平常時・地震時の安定供給の観点から地震防災・維持管理投資を計画するが，両者の目標性能値は必ずしも一致するものではない．本研究では，地震リスクマネジメント手法を用いて，利害関係者が合意できる目標性能値を満足する地震防災投資規模の決定法を提案する．

New Reference Wind Speed for Wind Turbines in Typhoon-Prone Areas in the Philippines

レベル2地震動に対する既設構造物の耐震性能を確保するためには，所要の耐震安全性能を実現できる耐震補強工法を選択できなければならない．本研究は，補強杭を用いた既設杭基礎構造物の性能設計法の定式化を行い，耐震性能に関する目標性能を実現するための新設計手法を提案したものである．