Steel reinforcing, dynamic strength

The allowable strength of materials is higher under dynamic loads, which produce high strain rates, than under static loads. This results in higher resistance to dynamic loads. The most important increases are in the compression strength of concrete and the yield strength of the steel reinforcement. 

Dynamic Strength. The dynamic design strengths for steel reinforcing and concrete are equal to their static design strengths times the appropriate Dynamic Increase Factor (DIF). 

Huettner [141] discusses the role of carbon fiber composites in state-of-the-art ceramics in surgery, such as reinforced carbon shaft endoprosthesis, and finds that cfrp is suitable for the construction of endoprosthesis shafts having high static and dynamic strength. Claes [142] describes experimental investigations on hip prostheses with carbon fiber reinforced carbon shafts with ceramic heads, finding cfrp more suitable than stainless steel. 

The test results show that the RPC possesses high bond strength, dynamic modulus, and bond durability as compared with other concretes. The adhesion between the RPC and the steel is also much greater than that for the other concretes. It would be interesting to verify the consequences of this improved adhesion in reinforced concrete structures. 

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