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    COMPARISION OF HYBRID BARRIER SYSTEM WITH CONVENTIONAL BARRIERS
    (2021-08) Anwer, Mohammed Jalil
    One of the leading causes of passing away in our country, like in the rest of the globe, is traffic incidents. When traffic incident data are analyzed, it is well understood that the mortality or injury rates caused by errant vehicles are astounding and are dependent on the properties of the obstacles. Steel, concrete, wood, and plastic are the most common barrier materials used around the world, each with its own set of advantages and disadvantages, such as construction time, easy installation, low price, demonstrated efficacy, crash defending, reliability, life-time, and maintain. Because of the protection and structural demands, aesthetic considerations have still not been kept in mind for the design of obstacles in general, and wooden barriers in particular have been overlooked. The hybrid barriers brought a different aspect in terms of aesthetics. The aim of this study is to observe the crash performance of the hybrid (wood+sand) barrier and compare with the conventional ones (steel and concrete) according to the EN 1317 standards by carrying out experimental pendulum crash tests by using 1500 kg pendulum device. The results showed that the hybrid and w-beam barrier have near performance in term of Acceleration Severity Index (ASI) and working width not exceed the standards but meet the requirements but the concrete barrier failed due to its high ASI according to EN 1317 standard. This study will be the first step for validation and verification process of virtual testing and for real-time crash testing of aforementioned road restraint systems.
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    Experimental and numerical comparative crashworthiness analysis of innovative renewable hybrid barrier with conventional roadside barriers
    (Taylor & Francis Ltd, 2023) Yumrutas, Halil Ibrahim; Ozcanan, Sedat; Apak, Mustafa Yurdabal; Anwer, Mohammed Jalil
    Guardrails are passive safety elements used in roadside safety. They are commonly manufactured as steel and concrete. There are also guardrail systems in which wood and steel materials are used together. This study investigated the crashworthiness performance of a newly developed F-shape type renewable hybrid barrier (RHB) system consisting of wood, steel and sand components. Commonly used steel guardrail and F-shape type concrete barrier were used for performance comparison. For this, a pendulum impactor has been set up. The impact performances of the aforementioned guardrails in the pendulum assembly were determined, then tests were carried out by modelling the pendulum system in the LS-DYNA environment for full-size crash testing and calibration. Calibration and validation were performed by comparing the Finite Element (FE) results with the pendulum results. Then, to determine the crashworthiness and safety of RHBs and compare them with steel and concrete barriers, full-size finite element models were created in the TB11 test standard specified in the European roadside safety standard - EN1317. As a result of the analysis, while providing the comfort of a concrete barrier after impact, RHBs perform close to the steel barrier in terms of safety. This study will be the first step before the prospective full-scale crash analysis.