Experiments And Nonlinear Analysis On Seismic Behavior Of High-strength Concrete Columns With High-strength Transverse Reinforcements

As the people require the structure become more and more better,the building become more higher, the span and load become more larger,people's demand for high-strength concrete growing more and more, but high-strength concrete has its own shortcomings, such as poor ductility, the small ultimate strain. In the earthquake, the common transverse reinforcement can not be effectively restrain, resulting in seismic behavior of the high-strength concrete columns is poor. The high-strength concrete with the high-strength transverse reinforcement can improve the ductility of high strength concrete structures, increase seismic behavior of high strength concrete member and full play to advantages of high-strength concrete.In this paper, using low cycled reversed loading experiment of 10 high-strength concrete columns restrained by high-strength composite transverse reinforcement under high axial compression ratio , study the failure process, failure modes, hysteretic behavior and energy dissipation capacity,analyse the effect of axial compressive ratio, quantity of transverse reinforcement, and transverse reinforcement form to the ductility. the experiment is simulate by the non-linear analysis. The result show that, with the rational allocation of high-strength transverse reinforcement the high-strength concrete sample can be effective constraint, the sample showed good seismic performance;the effect of transverse reinforcement spacing and the axial compression ratio to the seismic behavior of samples is obvious,when they get smaller, the seismic behavior of samples get better;the effect of three transverse reinforcement forms to seismic performance is not obvious, the constraint effect of spiral form is a little better than the other two form. Using the non-linear analysis we can find that the largest bearing capacity of the non-restraint high-strength concrete column has not changes anymore, but then declined rapidly after the largest bearing capacity, the seismic performance is poor. So we can see that using high-strength transverse reinforcement can be significantly improved the seismic behavior of the high-strength concrete columns.