Dynamic Performance Study Of Strengthening Reinforced Concrete Column With Steel

As the development of reinforcement and reconstruction of buildings rapidly, the study and application on the reinforcement theory and technology of concrete structures become the one of most important research tasks of structure engineering.It is especially the top priorities about strengthening the structure after seismic studies in our country such a multiple earthquake zone.According to construction practices and the characteristics of bearing laod about strengthening method with wet encased steel, the paper issue analysis and study the work mechanism of strengthening reinforced concrete column with wet encased steel . According to tests of low cyclic reversed loading, the dynamic Performance about the two type specimens has been studied,and also been tested and verified by numerical simulation methods . Failure patterns, hysteretic curves, skeleton curves, ductile coefficients, energy dissipation of reinforced concrete column strengthened with wet encased steel are obtained.The seismic performance of strengthened concrete columns is studied.Throughout the numerical simulation methods,the work performance is analysised and studied about strengthening reinforced concrete column with wet encased steel. So some conclusions are made: the ductility of strengthening reinforced concrete column with wet encased steel is better than ordinary concrete columns. The energy performance of strengthening reinforced concrete column with wet encased steel compared with ordinary concrete columns do not improve. The batten plates of encased steel bear tensile stress ,and constraint the concrete. The stress of strengthening reinforced concrete column with wet encased steel is three-dimensional compression which can increase the compression strength of concrete,so the loading capacity of the strengthening concrete column is increased. The spacing of batten plates should be reduced at the bottom of column, and the first batten plates should be layed at the bottom of column. Concrete column is strengthened using cement slurry and G-type grouting material.According to the test and the past working examples, the G-type grouting material is regarded as the combination during the construction process.The research in this paper have some value to the study on property of envelope iron structures more and the perfect of reinforcement code of concrete structure, and it can provide reference for the design and construction of reinforcement and reconstruction of concrete structures.