Experimental Study And Nonlinear FEM Analysis On Seismic Performance Of CFRP Steel Reinforced Concrete Filled With Steel Tube Concrete Column

In order to research the mechanical properties of CFRP steel reinforced concrete filled with steel tube concrete column under low frequency cyclic loads to provide a reference for practical engineering application. CFRP steel reinforced concrete filled with steel tube concrete column as a new structure, Task Force has carried out six steel reinforced-concrete composite steel stub columns under axial compression, the experimental study bias and 5 Steel-Experimental study on seismic performance of steel concrete composite columns under cyclic loads.This article is to study the seismic behavior of structures on the basis of original research conducted, produced three carbon fiber reinforced-steel concrete columns and its quasi-static test, analyze the different components of axial compression ratio under load-displacement hysteresis curves, skeleton mechanical properties of the curve, ductility coefficient.While using ABAQUS carbon fiber reinforced-hysteretic behavior of concrete filled steel columns numerical analysis and experimental verification. Come regardless of axial compression ratio change, hysteresis curves have better stability curves were tested plump spindle or bow, there is no obvious pinch phenomenon, indicating a strong plastic deformation member;With axial compression ratio increases, the skeleton curve segments appear more significant decline and ultimate bearing capacity of members is reduced, extreme points corresponding displacement becomes smaller; ultimate load, ultimate displacement and ductility factor both with axial compression ratio increases and reduced. The simulation results are in good agreement with the experimental results.Using the finite element software ABAQUS, considering the number of layers, pipe diameter, concrete strength, axial compression ratio of several factors affecting CFRP steel reinforced concrete filled with steel tube concrete column under cyclic loading level carried out by force simulation.By analyzing the curves and contours of the stress:in the horizontal reciprocating loads, carbon fiber reinforced-concrete filled steel tube column load-displacement hysteretic curve is full, shuttle-type hysteresis loop was no obvious pinch phenomenon. By changing the carbon fiber layers, pipe diameter, concrete strength and axial compression ratio in any one of the four factors, the specimen load-displacement hysteresis curve shape are roughly the same. With the increase of the maximum load of carbon fiber layers, the specimen can withstand the increased overall stiffness increase; maximum load with increasing pipe diameter, the specimen can withstand increased; With the improvement of the concrete strength, specimen bearing capacity increase; large axial compression ratio in the range of axial compression ratio decreases help to improve the bearing capacity of the specimen. Therefore, CFRP steel reinforced concrete filled with steel tube concrete column ductility, with good seismic performance, can be applied to practical engineering.