Abstract
The structural performance of damaged open-web type of steel encased reinforced concrete (SRC) beam-columns after retrofitting was experimentally investigated. The experimental parameters were the open-web type of the encased steel and the maximum tip displacement of the columns during the initial loading. First, each column was cyclically loaded to the targeted displacement. Subsequently, the test columns were retrofitted and reloaded. The damaged portions of each column were retrofitted with the polymer cement mortar, and the epoxy resin was injected into the cracks. The experimental results indicated that the measured stiffness of the retrofitted columns was lower than the initial ones, while the displacements experienced in each column were different. The lower stiffness might be attributed to deterioration of the concrete rigidity, low rigidity of the resin and imperfect injection of the resin. Numerical analyses were also conducted to evaluate the retrofitted column behavior. The effect of the strain hysteresis of concrete at the first loading was considered for the behavior at the second loading. The analytical results predicted the experimental behaviors fairly well, which implies the validity of the analytical methods presented in this paper for evaluating the structural performance of the retrofitted SRC columns.
Highlights
After a strong earthquake, many damaged buildings and infrastructures are demolished and reconstructed instead of being seismically retrofitted and reused because the structural or seismic performance of the damaged buildings and infrastructures after retrofitting was unclear, which makes it difficult to reliably and accurately evaluate to what extent the damaged components and structures could be recovered
Considering the fact that the greenhouse gas emitted from the construction industry accounts for a large percentage of the total national emissions in Japan [1], retrofitting the damaged building and infrastructures, and extending their serviceability life can contribute to reducing the carbon dioxide emissions and enhancing the sustainability of buildings and infrastructures, and of the society
Standard tensile and compressive tests were conducted for the steel, concrete, polymer cement mortar and epoxy resin, which were injected into the cracks of the damaged portions, to gain the mechanical properties of the materials used
Summary
Many damaged buildings and infrastructures are demolished and reconstructed instead of being seismically retrofitted and reused because the structural or seismic performance of the damaged buildings and infrastructures after retrofitting was unclear, which makes it difficult to reliably and accurately evaluate to what extent the damaged components and structures could be recovered. Repairing, retrofitting and strengthening of damaged reinforced concrete (RC) structures by using epoxy resin have been widely used and well-studied [2,3]. There is little, if any, information on the retrofitting of steel-encased reinforced concrete (SRC) components by epoxy resin despite SRC structures being used widely in infrasStursutacintaubirlietys2a01n9d, 11b,uxiFlOdRinPgEEsRthREroVuIEgWhout Japan since the 1960s. 2. Experiment of Open-Web Type SRC Beam-Columns. Outline of Experiment Test specimens were open-web type SRC beam-columns and their encasements were built with weld-conTneescttespdecoimr benosltw-ceorne noepcetne-dwebbattytepne SsRteCebl epalmat-ecosl.umSpnescainmdetnhesirweenrceasteemsteendts uwnedreebruailtcwomithbined constwanetlda-xcoianlnleocateddaonrdbcoylct-lciconlanteecrteadl lobaatdte, nussitnegeltphleatleosa.dSipnegciampepnasrawtuersestheostwedn uinndFeigr uareco1m. The experimental parameters were the open- 3 of 12 web type of steel encasement, the tip displacement of the columns at the initial loading and the axial load ratio.
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