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Influence of the shape of head anchors on the durability of reinforced concrete elements
Martinez-Echeverria, M. Jose,Gil-Martin, Luisa Maria,Montero, Jose Rodriguez,Hernandez-Montes, Enrique Techno-Press 2020 Advances in concrete construction Vol.10 No.1
This paper looks into how the shape of headed bars may influence the durability of reinforced concrete structures. Nowadays the only heads used in site works are cylindrical in shape. An alternative shape of head is studied in this piece of work. The new head reduces the concentration of stresses and so the appearance of cracks. In this work durability is studied based on both, first cracking and failure mode. An experimental campaign of 12 specimens and finite element modelling are described. The specimens were subjected to an accelerated corrosion process using an electrical current supply. Direct current was impressed on the specimens until breaking. Test results and the results obtained from numerical models are presented. Results are presented in term of comparison between the two shapes of heads studied. It was shown that the shape of the head has a significant influence on durability of reinforced concrete structures with headed reinforcing bars.
30kW DC-DC Converters with Regenerative Mode for Electric Cars
Ibanez, Federico,Vadillo, Javier,Maiza, Miguel Martinez-Iturralde,Echeverria, Jose Martin The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.2
This paper presents a design of a 30kW 250V/530V bidirectional DC-DC converter to be used in an electrical car. A detailed explanation of the design is given. The system uses two phase shifted half bridge (boost and buck) topologies to reduce the ripple current in the output capacitor. The converter has an efficiency of 95% at nominal power. It works as a constant voltage in one direction and as a constant current in the other to charge the batteries. Simulations and measurement are done at high power to test the efficiency.
30kW DC-DC Converters with Regenerative Mode for Electric Cars
Federico Ibanez,Javier Vadillo,Miguel Martinez-Iturralde Maiz,Jose Martin Echeverria 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.2
This paper presents a design of a 30kW 250V/530V bidirectional DC-DC converter to be used in an electrical car. A detailed explanation of the design is given. The system uses two phase shifted half bridge (boost and buck) topologies to reduce the ripple current in the output capacitor. The converter has an efficiency of 95% at nominal power. It works as a constant voltage in one direction and as a constant current in the other to charge the batteries. Simulations and measurement are done at high power to test the efficiency.