Papers by Author: Arman Safa

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Authors: Ebrahim Safa, Arman Safa
Abstract: Abstract .Transportations one of the important indexes of air pollution in cities has always occurred in the form of a big Unavoidable problem. Lack of comprehensive approach and enough (Sufficient) attention toward transportation and traffic issues have unsparing social, economical and environmental costs and damages in the country which the most important of them are: high fuel consumption and growth of the fatal and injury crashes, air pollution and environmental damages. Among the public transportation networks, railway public transit is known as the healthiest, fastest, safest and generally the most efficient transportation network which is proved the undeniable role in solving economic, social and environmental problems caused by public transport and traffic problems. Considering the political and economic centrality of Tehran as capital of Islamic Republic of Iran with an increasing population of over 10 million people, and the construction of satellite cities, and conducting population to these cities, it is important to construct several connecting subway lines for these satellite cities. This paper focuses on economic problems via comparing underground subway as public vehicle with motor vehicle.
Authors: Ebrahim Safa, Arman Safa, Abolfazl Hasani, Ali Mansourkhaki
Abstract: In the rigid pavement ,seams of joints has been used to prevent damage caused by expansion and contraction of the slab Changes in temperature differences and slab movement. On the other hand always rigid pavement cracks starting and totally starting the failure of the concrete slab are in this region that it has many different causes. In the Place of joints side uses the dowel bar for evidence performance that transfer the forces between slabs to control expansion and contraction changes in slabs. Destruction and deviation in the concrete slab joints side , the high cost of repairing and replacement of dowel bars and the cost of repairing the cracks and the failure of slabs are the reason for re-modeling, analysis and optimization of joints and dowel bar types. In This project, we try to define the role and influence of the shape of dowel bars and optimize the performance of joints in the rigid pavement.
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