Bond-slip constitutive model considering corrosion damage
To reasonably reflect the influence of bond-slip performance degradation of corroded steel bars on the seismic performance of reinforced concrete(RC)structures,stress-slip relation-ship of steel bars was deduced based on an existing bond stress distribution model.Then,a bond-slip constitutive model considering the corrosion damage of steel bars was established by analy-zing the influence of corrosion on bond-slip mechanism between concrete and steel bars.Based on existing pull-out test results,the rationality and accuracy of the proposed model were verified by comparing it with the Cheng model by only considering the influence of the longitudinal reinforce-ment corrosion rate.Based on the finite element platform OpenSEES,fiber beam-column and ze-ro-length section elements were connected in series.The bond-slip model proposed in this paper was nested in the steel bar constitutive model of the zero-length section element;thus,a corro-sion damage fiber beam-column model considering bond-slip was established.The accuracy of the proposed model was verified using quasistatic test results of six corroded RC columns.These re-sults show that the hysteresis curve calculated by the proposed corroded RC fiber beam-column model considering bond-slip agrees well with the experimental hysteresis curve,and the maxi-mum error of cumulative energy consumption is not more than 15％.In addition,factors affecting the slip of the corroded steel bar were studied using parameter analysis.The results show that yield and ultimate slips obviously decrease with increasing volume stirrup ratio and slightly change with an increasing ratio of concrete cover to steel bar diameter.
国家科技期刊平台
NSTL
万方数据
维普
