TRB's National Cooperative Highway Research Program (NCHRP) Report 679: Design of Concrete Structures Using High-Strength Steel Reinforcement evaulates the existing American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications relevant to the use of high-strength reinforcing steel and other grades of reinforcing steel having no discernible yield plateau. The report also includes recommended language to the AASHTO LRFD Bridge Design Specifications that will permit the use of high-strength reinforcing steel with specified yield strengths not greater than 100 ksi. The Appendixes to NCHRP Report 679 were published online.The latter approach is necessary when considering high-strength steel reinforcement. ... Bischoff (2005), in addition to providing a thorough review of all deflection investigations briefly summarized above, proposes a ... 1 2 Im M M e cr cr a = ()Eq.2 Where: k nk cr cr = + a() ai 3 1I ap ac Im= a1 I I cr g I I ac ab ay 3 2 bd 3 cr k n nn cr =() + a I II 2 2 n = modular ratio ... spacing of flexural reinforcement to affect adequate crack control is as follows: s ac 15 a a a a an a 40000 , f s c c a ac 25 12 .
|Title||:||Design of Concrete Structures Using High-strength Steel Reinforcement|
|Author||:||Bahram M. Shahrooz|
|Publisher||:||Transportation Research Board - 2011-01-01|