Experimental Research On The Effects Of Loading Performance About SRHC Column With Different Stirrup Ratio And λ=3 On The Repeatedly Horizontal Load

With the development of modern construction and its ever-increasing height and span, the traditional reinforced concrete structures can no longer meet the requirements. As the columns at the bottom of high-rise buildings and super-tall buildings carry huge axial compression, if we still use the common reinforced concrete columns, due to the restriction of axial compression ratio, we have to increase the section of the columns, which not only affects their function but also leads to short columns with poor seismic behavior. Based on many experiments, it's shown that steel reinforced concrete columns can effectively reduce the axial compression ratio in the concrete because the steel shares part of the axial compression, so that they will improve the seismic behavior. Therefore, reinforced high-strength concrete columns, especially steel reinforced high-strength concrete columns are widely used in modern construction. Research on the repeated horizontal load experiments indicates that stirrup ratio is an important factor which affects the seismic behavior of steel reinforced high-strength concrete columns. As the increase of the stirrup ratio, the ductility and seismic behavior will improve as well. As a result, the stirrup ratio in steel reinforced high-strength concrete columns must be appropriately distributed to ensure good seismic performance and meet the required standard.Failure patterns, hysteretic curves, skeleton curves, ductile coefficients, energy dissipation and strength degeneration of steel reinforced high strength concrete columns are obtained by conducting tests of 4 specimens with concrete strength from 73.3MPa to 81.9MPa under low cyclic reversed loading and the influences of stirrup ratio on the seismic performance of steel reinforced high strength concrete columns are also analyzed.Then shear mechanism and shear carrying capacity are analyzed,finaly bond stress between steel and high-strength reinforced concrete is calculated cursorily.