Comparative Experimental Research On Earthquake-resistant Behavior Of Steel Bar Reinforced High-strength Concrete Columns

With the development of modern construction and its ever-increasing height and span,thetraditional reinforced concrete structures can no longer meet the requirements.As the columnsat the bottom of high-rise buildings and super-tall buildings carry huge axial compression,ifwe still use the common reinforced concrete columns,due to the restriction of axialcompression ratio,we have to increase the section of the columns,which not only affects theirfunction but also leads to short columns with poor seismic behavior.Based on manyexperiments,it’s shown that steel reinforced concrete columns can effectively reduce the axialcompression ratio in the concrete because the steel shares part of the axial compression,so thatthey will improve the seismic behavior.Therefore,reinforced high-strength concretecolumns,especially steel reinforced high-strength concrete columns are widely used inmodern construction.Steel reinforced high-strength concrete structure has a lot of merits such as:highload-bearing capacity and good ductility,but the connection of the reinforced concrete beamstructure is complex.Use steel bar instead of steel put in the core of the central column sectionparts, namely form a new column. In have the advantages of steel reinforced high-strengthconcrete column at the same time, convenient for connects the reinforced concrete beam andconstruction.Steel bar reinforced high-strength concrete column needs further research. Themain achievements of the dissertation are listed as following:(1) Make a statement in detail about steel reinforced concrete and steel reinforcedhigh-strength concrete.(2) Design for four steel bar reinforced high-strength concrete columns specimens andcarried out the axial compression tests. Seismic behaviors such as failure pattern and steelstrain etc were investigated after the tests.(3) Design for seven steel bar reinforced high-strength concrete columns specimens andcarried out quasi-static experiment under low cyclic loading. Seismic behavior such as failurepattern, steel strain, hysteretic characteristics, energy dissipation, displacement ductility and rigidity degeneration etc were investigated after the tests.(4) The author simulates the column specimens tested above by finite element software,and compares the result between calculation and analysis, in order to verify the accuracy andfeasibility of finite element method.