Research On The Seismic Performance Of Reinforced Concrete Column With Distributed Steel Bars

Due to the good seismic performance of Steel Reinforcement Concrete (SRC), there is awide range of application that SRC has been applied in building structures, especially in thehigh-rise building structures, but, there are also some accompanied disadvantages during theapplication such as it is difficult that beams reinforcement crossing the columns at the jointpart when there are core steels inside the column which adopting SRC structure during theconstruction process; Building stirrups is another problem that you would face whenconstructing the columns. Having considered the above considerations, the research group hasproposed a core section with distributed bar steel, which based on the same ratio of steelcontent in the core section, to tackle the difficulty of the SRC construction and thereinforcement crossing problem of joints, moreover, it cost less than the common SRCstructures. This article has carried out test investigation and numerical study in terms ofseismic performance of SRC with distributed steel bars (SRCDSB).There has built three specimens, a SRCDSB column、 a SRC and a RC withreinforcement core section, which have been test with low frequency cyclic load, to investigatethe seismic performance of the three bucking specimens. Some characters of seismicperformance such as damaged model、 hysteresis loop、 dissipation capacity、 stiffnessdegeneration、skeleton curve and ductility performance impacting on the seismic performanceof the SRCDBS specimen have been studied comparing to the other two specimens.The test results show that SRCDSB perform well in seismic resistance, this sectionnormally destroyed in bucking damage model suffered from hysteresis load, which has a fullhysteresis loop without significant pinch effect; Meanwhile, SRCDSB specimen has a similarcase with statistics of SRC specimen in seismic performance, which are all better than thespecimen of RC with reinforcement core section; SRCDSB which cost less price has a niceseismic performance, it is decent application prospect that SRCDSB adopted in high-risebuilding structures.In order to research the details of the SRCDSB performance, nonlinear numerical studyhas been conducted by ABAQUS which was general finite element analysis software,including the process such as material model、establishing of the finite element model、gridmesh、loading and solving etc. There is a comparison between the test and numerical result,which has testified the correctness of the FE model, carrying out the parameters analysis ofSRCDSB. The numerical investigated results shows that: this article calculated the push-overcurves, adopting the confined concrete constitutive model, which could meet the test resultwell; With the increasing of the axial compression ratio, the numerical specimens have thetrend as soaring to the maximum and then creeping down, corresponding the characters ofbucking column; The ductility of the column has continually declined during the decreasingof the ductility coefficient; The lateral load has raised with the increasing of ratio of steelcontent、concrete strength and the core steel yield strength respectively, the core steel yieldstrength has a limited impact on the lateral load; The ductility coefficient has opposite trend,corresponding to the increase of ratio of steel content and concrete strength, meanwhile, thisis almost paralleled with the trend of the core steel yield strength; The axial compression ratiohas a crucial influence on the lateral load which also affected by the concrete strength, butthere has a limited impact on the lateral load by ratio of steel content and core steel yieldstrength; The ductility coefficient which has been obviously influenced by many factors is asensitive index.