Hysteretic Behavior Analysis Of FRP Pipe Concrete Column Under Low Reversed Cyclic Loading

FRP pipe concrete column is that the concrete is poured in prefabricated FRP pipe and become so-called FRP confined concrete columns.The feature of these colunns are that FRP pipe interact with concrete column in the process of loading, namely as a result of the existence of concrete to prevent the parenchyma of the FRP pipe buckling constraint effect of concrete and FRP pipe,which make concrete under complex stress state. Thus that improve the strength of the concrete,improve the plasticity and toughness properties greatly.That has played a very good seismic effect.There were many earthquakes in China, seismic design of buildings is particularly important,FRP pipe concrete column have been attached more and more attention from the researchers because of its own advantages.The present research is mainly about FRP reinforced specimens under low cyclic reciprocating load seismic performance.Research on seismic performance of FRP pipe concrete column is not a lot,which can’t meet the needs of the engineering seismic analysis.This paper aims to simulate the seismic performance of FRP pipe concrete column under low reversed cylic loading.To explore the change rule of mechanical property of strength,stiffness and ductility of FRP pipe concrete column under the action of earthquake.The research content is as follows:1. According to the relevant literature orerall analysis the dperformance of FRP pipe concrete column.2. Finite element was applied,the FRP pipe concrete column was modeled entity under low reversed cyclic loading.3. Analysis of FRP pipe concrete column hysteretic performance by variable parameters of compression ratio, slenderness ratio, diameter-thickness ratio, concluded that P-△hysteresis curve of each column,than analysis of the hysteretic performance of each column.4. According to the hysteretic curves obtained skeleton curves of the specimens, analysis of ductility performance and stiffness degradation of the specimens.Research results show that:1. When the slenderness ratio, diameter-thick ratio unchanged, With the increase of axial compression ratio, FRP pipe concrete column hysteretic curve of envelope strength degradation is more and more significant.2. When the slenderness ratio, axial compression ratio is constant, as the component diameter with the increase of thickness ratio, the strength of the hysteresis curve of envelope degraded more and more significant.3. When diameter-thick ratio, axial compression ratio, slenderness ratio increases, under the condition of invariable in the artifacts section, namely component length increases, with the increase of member length at the top of the component happen the same case, the horizontal displacement of horizontal displacement of the components of the restoring force.