钢筋混凝土结构的钢筋锈胀引起的保护层开裂_英文_资料.pdfVIP

Wang et al. / J Zhejiang Univ-Sci A (Appl Phys Eng) 2014 15(7):496-507 496 Cover cracking model in reinforced concrete structures subject to rebar corrosion* Zhi WANG1, Xian-yu JIN1, Nan-guo JIN??1, Xiang-lin GU2, Chuan-qing FU2 (1Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China) (2Department of Building Engineering, Tongji University, Shanghai 200092, China) ?E-mail: jinng@ Received Nov. 24, 2013; Revision accepted June 4, 2014; Crosschecked June 24, 2014 Abstract: A new cover cracking model is proposed for rebar corrosion. Rebar corrosion involves rust, which contributes to an expansive radial pressure at the concrete-steel interface and hoop tensile stresses in the surrounding concrete. Once the stress state exceeds a certain limit, anisotropic damage occurs. First, we establish an anisotropic damage model for concrete, which fully reflects the unilateral effect. Then an analytical model is proposed to calculate the displacement and the stress in a corroded re- inforced concrete (RC) structural member based on that anisotropic damage. In this study, a concrete-rust-steel composite model is considered as a circular cylindrical concrete cover and a coaxial, uniformly-corroded, steel rebar, where the steel rebar and the mechanical properties of rust can be fully taken into account. At the same time, the influences of the steel-concrete interface pores and the cracks in concrete on the rust expansion pressure value are modeled. Finally, some experiments are made for comparison with the analytical results and good agreement indicated the proposed model could be used to predict both the variation of strain fields in structures during the corrosion process and the cover cracking time. Key words: Reinforcement corrosion, Anisotropic damage, Analytical model, Concrete cover cracking doi:10.1631/jzus.A1300393 Document code: A CLC number: TU375 1 Introdu