No abstract

Tüm İstanbul genelinde doğal gaz yer üstü varlıklarının kaza kara noktaları ve ana arter kenarında riskli konumda bulunanlar tespit edilmiştir. Bu noktalar yol ve araç kaynaklı çeşitli çarpma risklerine karşı değerlendirilmiştir. Bu değerlendirme Analitik Hiyerarşi Süreci yöntemi gibi ölçülebilir bir metod vasıtasıyla gerçekleştirilmiştir. Elde edilen sonuçlar tehlikeli yol kenarı tesislerinin tasarımı veya bunları koruyucu sistemlerin tasarım esaslarının ortaya çıkmasında kullanılmıştır. Anahtar kelimeler: Analitik Hiyerarşi Süreci, doğal gaz yer üstü varlığı, yol kenarı emniyet mesafesi, risk kriteri.

The safety of risky roadside zones such as kids’ playgrounds, schools, bus stops, petrol stations, critical roadside facilities, and pavements are becoming a significant worldwide problem. This study focused on the roadside safety of critical above-ground assets of natural gas grids due to its consequences such as fire, blast, traffic interruptions, service downtime, and consumer displeasure during the repair process. In this regard, a novel modular shallow mounted bollard system was designed considering the disadvantages of conventional bollard systems in the literature and the demands/needs of related institutions. Numerical simulations were carried out to analyze the structural and safety performance capabilities of the originally designed bollard system following PAS 68:2013 standard. In addition, FE models were created and incorporated with the verified vehicle models to simulate dynamic behaviors. LS-DYNA software analyzed the FE models. As a result of the simulations, the newly developed fixed bollard design can safely stop vehicles that weigh 18,000 kg max., except for the 30,000 kg N3 class vehicle, up to 50 km/h. The results revealed that proposed bollard designs successfully met the standard requirements for the vehicle types and speed that represent general urban traffic characteristics. Thus, the new fixed bollard design will contribute to roadside safety in metropolitan areas by protecting critical hazardous roadside facilities. In the next stage, the newly designed barrier system should be optimized to lighten the system and reduce the costs.