CFRP加固高温后圆钢管混凝土结构轴压力学性能分析

在恒定高温作用后,对12个圆钢管混凝土短柱试件进行CFRP加固后的轴压力学性能分析.通过轴压承载力试验,研究了不同恒温及不同约束效应系数时CFRP-圆钢管-混凝土结构的轴压力学性能和变化规律.试验数据对比分析表明,高温作用后的圆钢管混凝土承载力和弹性模量随温度升高而降低,采用CFRP加固的高温受损构件力学性能明显得到改善.在综合分析基础上,利用简化公式计算的结果与试验分析结果吻合较好.

Mechanical Properties of Concrete-Filled Steel Tube Columns Strengthened with CFRP Under Axle Load After High Temperature

The mechanic properties and behavior of 12 concrete-filled short steel tube columns strengthened with carbon-fiber-reinforced polymer(CFRP) sheets wrapped externally as specimens after the effects of different constant high temperatures were investigated experimentally under axial loads with different restriction coefficients.The temperature,concrete compressive strength and number of CFRP layers are the main parameters to investigate.Comparisons were made for the standard section and equivalent sections with one and two layers of CFRP involving the improvements in stiffness and bearing capacity.The static test showed that the effect of constant high temperature results in decreased strength and weakend performance,and the mechanical properties of concrete-filled steel tube columns can be extended significantly by wrapping CFRP sheets externally.Analysis and experimental results including elastic modulus and compressive strength are given to demonstrate the validation of the proposed calculation method.