复材围束补强含箍筋混凝土火害高温影响的承载模式探讨与分析

Effect of High Temperature Fire Victims Bearing Mode Discussion and Analysis on Composites Confinement Stirrups Containing Concrete Reinforcing

本研究针对含箍筋混凝土试体进行完整深入的火害补强研究,研究结果显示,随火害温度增高,火害后抗压强度折减越大,而强度所对应的尖峰应变则越大。高强度混凝土火害强度折减效应较低强度混凝土大,其对应的尖峰应变增加比例亦较高。不论试体是否受火害作用,箍筋或复材的围束效果均以低设计强度混凝土较佳。室温下的箍筋间距较大的混凝土试体其抗压强度会比纯混凝土强度较低,但应变仍有提升效果;而在高温火害下其试体抗压强度却比纯混凝土高。不管设计强度高低或箍筋间距大小,当混凝土受火害温度愈高,经复材补强后,其补强效果愈佳,尖峰应变的增加也较大。

In this study,stirrups for concrete test specimen containing a complete in-depth studies of fire damage reinforcement, the results show, with fire damage temperature increases, the greater the reduction compressive strength after fire damage,while the intensity of the corresponding peak strain the greater. High-strength concrete fire damage reduction effects of low intensity strength concrete,which corresponds to the peak strain increase the proportion is higher. Regardless of whether the test body by the fire damage effects,stirrups or confinement effects are complex material of low strength concrete design better. Stirrup spacing at room temperature greater concrete compressive strength test specimen will be lower than that of pure concrete strength,but still enhance the effect of strain; and at a high temperature fire damage at its test high compressive strength than pure concrete. Regardless of the design strength level or stirrup pitch size,while increasing concrete fire damage higher the temperature,the complex material reinforcement,its reinforcing effect is more good,peak strain as well.