Studies On Flexural Capacity And Ductile Deformation Ability Of RC Beams Subjected To Partial Rebar Corrosion

Reinforced concrete structure has such advantages as high structural stiffness, low project cost and little later maintenance cost, which has been widely used. Among bridge structures during service life in China and abroad, structure destruction problem caused by reinforcement corrosion is very severe, which leads to a large number of RC structures fatigue in advance and fail to reach scheduled service life, affects national economy. Therefore, the RC durability researches have great significance. Currently, many researches have conducted on RC member with uniform rebar corrosion, while relatively less investigation on cracking morphology and flexural capacity influenced by rebar partial corrosion.Regarding current issue, static flexural test of partial corroded specimens with different corrosion rate are conducted, basing on experimental data, RC beam with partial corrosion are simulated by explicit dynamic finite element software LS-DYNA. By analyzing the cracking morphology, flexural capacity and ductile deformation ability, the comparative results of FE analysis and experiment are presented:With the increase of the partial corrosion rate, the cracking region is almost constant, the number of cracks reduces, maximum cracking width increases, diagonal cracking length reduces, crack spacing becomes unequal gradually; yield strength deteriorates, flexural capacity reduces noticeably; initial stiffness of partial corroded RC beam slightly increases, bending stiffness decays after reaching yield point. With the increase of corrosion rate, RC beam stiffness deteriorates; energy absorption ability decreases, ductile deformation ability decays; the applicability of LS-DYNA concrete models in similar RC numerical simulation are verified.