Issue 35

W. Xu et alii, Frattura ed Integrità Strutturale, 35 (2016) 481-491; DOI: 10.3221/IGF-ESIS.35.54 491 [7] Fan, Y.F., Zhou, J., Mechanical property of rusty rebar considering the effects of corrosion pits, Journal of Building Materials, 6(3) (2003) 248-252. [8] Ministry of Construction. GB50010-2010 concrete structural design standard. Beijing: China Architecture & Building Press, 2010. [9] Zhao. Y.X., Jin, W.L., Modeling the amount of steel corrosion at the cracking of concrete cover, Advances in Structural Engineering, 9(5) (2006) 687-696. [10] Wang, J.Q., Experiment study and analysis on the mechanical properties of corroded reinforcing bars in the atmospheric environment, Journal of Xuzhou Institute of Architectural Technology, 3(3) (2003) 25-27. [11] Wu, Q., Yuan, Y.S., Li, J.Y., Research on structural behavior’s deterioration of corroded reinforced concrete beams under man-made climate, Journal of China University of Mining & Technology, 36(4) (2007) 442-445. [12] Wu, J., Wang, C.X., Xu, J., Xiao, Z., Wu, F.H., Study on flexural behavior of corroded reinforced concrete beams under fatigue loads, China Civil Engineering Journal, 45(10) (2012)118-124. [13] Shi, Q.X., Niu, D.T., Yan, G.Y., Experimental research on hysteretic characteristics of corroded R. C. members with fiexural and compressive axial loads under repeated horizontal loading, Earthquake Engineering and Engineering Vibration, 20(4) (2000) 44-50. [14] Choi, Y.S., Yi, S.T., Kim, M.Y., Jung, W.Y., Yang, E.L., Effect of corrosion method of the reinforcing bar on bond characteristics in reinforced concrete specimens, Construction and Building Materials, 54 (2014) 180-189. N OMENCLATURE c  refers to parameter value of descending branch of single-axial compressive stress - strain curve of concrete; , c r f refers to representative value of axial compressive strength of concrete, and its concrete value is determined based on actual structural analysis; , c r  refers to peak compressive strain of concrete corresponding to axial compressive strength of concrete , c r f ; c d refers to concrete single-axial compressive injury evolutionary parameter;  refers to compressive stress of concrete;  refers to compressive strain of concrete; c E refers to elasticity modulus of concrete; cu  refers to the compressive strain of concrete when the stress in descending branch of stress-strain curve is equal to 0.5 , c r f ; yc f and uc f refer to nominal yield strength and nominal ultimate strength of corroded steel reinforcement respectively; sc  and sc  stand for stress and strain of corroded steel reinforcement respectively; syc  and suc  stand for yielding strain and hardening strain of corroded steel reinforcement; e K refers to nonlinear spring; tg K refers to slope of unit force of spring - relative displacement; 1 R refers to initial radius of steel reinforcement; 2 R refers to external radius of corrosion product; 3 R is radius of remaining steel reinforcement section;  refers to corrosion rate of steel reinforcement; 0  is the space between non-corroded steel reinforcement and concrete;  refers to radial expansion displacement of concrete.