Abstract
SAP2000 software was used to build the finite element model of a six‐storey‐three‐span reinforced concrete (RC) frame structure. The numerical simulation of the seismic performance of the RC frame structure incorporating different levels of rebar corrosion was conducted using pushover analysis method. The degradation characteristics of the seismic performance of the corroded structure under severe earthquake were also analyzed. The results show that the seismic performance of the RC frame decreased significantly due to corrosion of the longitudinal rebars. And the interstory drift ratios increase dramatically with the increasing of the corrosion rate. At the same time, the formation and development of plastic hinges (beam hinges or column hinges) will accelerate, which leads to a more aggravated deformation of the structure under rare earthquake action, resulting in a negative effect to the seismic bearing capacity of the structure.
Highlights
SAP2000 software was used to build the finite element model of a six-storey-three-span reinforced concrete (RC) frame structure. e numerical simulation of the seismic performance of the RC frame structure incorporating different levels of rebar corrosion was conducted using pushover analysis method. e degradation characteristics of the seismic performance of the corroded structure under severe earthquake were analyzed. e results show that the seismic performance of the RC frame decreased significantly due to corrosion of the longitudinal rebars
Using the seismic demand spectrum and capacity spectrum (ATC-40 response spectrum or Chinese code response spectrum) to estimate the performance point index of the structure, one can evaluate the seismic performance of the structure [21]. e main advantage of the pushover analysis method is that the elastic-plastic response of the structure can be considered and the calculation results are stable. is paper analyzed the degradation law of the seismic performance indicators of the corroded RC frame structure under severe earthquake. e results were expected to provide a reference for seismic safety analysis, reliability assessment, maintenance reinforcement, and reconstruction of corroded RC frame structures
It can be seen that the P-M-M curves obtained by user-de ned plastic hinge are in good agreement with those by the built-in default hinge in SAP2000 software
Summary
A large number of experiments and theoretical analyses have shown that the concrete cover of a RC frame structure will be cracked and peeled off due to the role of rust expansion force after the steel corrosion. It weakens the bond strength between the rebar and concrete, reducing the service life of the structure [22, 23]. Numerical analysis usually adopts the method of equivalent uniform corrosion to deal with the degradation of mechanical properties of pit corroded steel bars, so as to improve the accuracy of numerical simulation or theoretical analysis [27]. Εuc (1.0 − 0.021δ)εu, where fy (fyc) is the nominal yield strength of the steel bar before (after) corrosion; Es (Esc) is the nominal modulus of elasticity of the steel bar before (after) corrosion; fu (fuc) is the nominal ultimate strength of the steel bar before (after) corrosion; εu (εuc) is the nominal ultimate strain of the steel bar before (after) corrosion; and δ stands for the mass loss rate of the corroded steel. e relationship between ρs and δ can be seen in (4) [28]
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