2Ryall M J. Bridge Management[M]. Planta Tree, Butterworth- heinemann (A division of Reed Educational and ProfessionalPublishing Ltd), 2001.
3Raina V K. Concrete bridges Inspection,Repair,Streng- thening, testing, and load capacity Evaluation[M]. Second print New Delhi:Tata McGraw-Hill Publishing Company limited, 2003.
4Cardinale G, Orlando M. Structural evaluation and strengthening of a reinforced concrete bridge[M]. Journal of Bridge Engineering, ASCE, 2004,9 ( 1 ) : 35-42.
