负载条件下CFRP加固轴心受压钢管短柱受力性能研究

该文以试验、有限元与理论相结合的方法研究CFRP(碳纤维)布加固轴心受压钢管短柱构件;以不同负载百分比、不同CFRP粘贴方式为对比参数,研究了加固后构件的受力性能。主要讨论了对于不同负载程度、CFRP粘贴方式对加固后构件极限承载力和破坏形态的影响。通过试验与有限元数值模拟及参数分析,得到随着负载百分比的增大,加固后构件极限承载力呈下降趋势,在极限状态下,构件的破坏形态主要为端部局部屈曲破坏;在构件端部粘贴CFRP的加固效果优于中部加固效果;随着CFRP加固层数的增大,构件极限承载力随之增大,但增大百分比在达到一定程度后呈现下降趋势;随着构件厚度的增大,负载百分比和CFRP层数对构件承载力的影响呈下降的趋势,通过理论与试验和有限元结果的对比分析,得出采用该文所推导的理论可以用于负载条件下加固构件的承载力计算。

RESEARCH ON MECHANICAL PROPERTIES OF AXIALLY LOADED TUBULAR STEEL STUB COLUMNS REINFORCED BY CFRP

The paper investigated the behavior of axially loaded tubular steel stub columns reinforced by CFRP (carbon fiber reinforced polymer) through experimental study, finite element modelling and theoretical analysis. The mechanical properties of reinforced members were studied by changing the initial load level and the paste way of CFRP. Then the influences of initial load level and paste way of CFRP on the ultimate bearing capacity and failure mode of reinforced members were discussed. Through experimental study, finite element simulation and parameter analysis, it was found that the ultimate bearing capacity of reinforced members decreases with the increasing of initial load. And the reinforced members mainly fail into local buckling at the end of tubular steel stub columns. The reinforcing effect of paste CFRP at the end of columns is better than that at the middle of columns. With the increasing of CFRP reinforcement layers, the ultimate bearing capacity increases. However, the increasing percentage decreases after it reaches a certain level. With the increasing of the thickness of tubular steel stub columns, the influences of the initial load level and CFRP layer decrease. A comparison among the results of experimental study, theoretical analysis and finite element simulation shows that the theoretical formulas proposed in this paper can be used to calculate the bearing capacity of axially loaded tubular steel stub columns reinforced by CFRP.