1. AASHTO 1989Guide Specifications for Strength Evaluation of Existing Steel and Concrete Bridge2001 (American Association of State Highway and Transportation Officials: Washington D.C.)
2. AASHTO 1994LRFD Bridge Design Specifications(American Association of State Highway and Transportation Officials: Washington D.C.)
3. AASHTO 2000Manual for condition evaluation of bridges(American Association of State Highway and Transportation Officials: Washington D.C.)
4. ACI 1998Building Code Requirements for Structural Concrete(American Concrete Institute Committee 318 (American Concrete Institute: Farmington Hills, MI, USA)