Seismic Performance Research Of Precast Concrete Columns In High-rise Buildings

Precast concrete structure has features such as, short construction period,low environment impact, high profit, etc. The seismic behavior of structure isvery important to the safety of the building, in order to utilize precast concretestructure into high-rise buildings, experimental research and numerical analysisof precast structure are needed. According to this purpose, this thesis focus onprecast concrete columns of lower layer in high-rise buildings, study the seismicbehavior through experiment and numerical analysis. The major contents are asfollowing:Through quasi-static low-cycle reciprocating experiment of precast concretecolumns of grouting-sleeve joint connection, obtained the failure mode, analyzedthe hysteresis and skeleton curves, compare the ductility and energy consumptionability. According to experiment results, the seismic behavior of precast concretecolumns is not worse than that of on-site cast concrete columns, as a whole.Furthermore, this thesis analyzed the changing trend of seismic behavior ofprecast concrete columns, when axial compression factor and grouting materialstrength changes. The experimental research results can be theoretical foundationof the utility of precast concrete structure in high-rise buildings.According to practical experiment situation, reasonably considering thesetup of material properties and boundary conditions, established the finiteelement model of precast concrete column of grouting-sleeve joint connection.The comparison of results of numerical analysis and experiment shows that themodels are similar to experiment specimen in failure mode, maximum bearingcapacity, ductility, therefore proved the liability and correctness of the numericalsimulation.For the axial compression ratio and concrete material strength whichphysical experiment failed to relate to, further analysis are conducted, usingnumerical model established in previous chapters. The results show that, withaxial compression and concrete material strength increased, the bearing capacityincreased, the ductility factor decreased. Furthermore, the impact of concrete material strength on bearing capacity and ductility factor of precast columns isgreater. Besides, when the concrete strength was set as C80, the failure mode ofprecast column became shear failure, as well as when axial compression0.80,therefore, the grouting-sleeve connection precast column should prevent frommanufactured in such conditions.