CFRP约束高强混凝土方柱应力-应变关系分析模型

目的研究CFRP（碳纤维增强塑料）约束高强混凝土构件的性能及基本受力特点，建立其应力-应变关系模型．方法通过不同加固形式的9组试件。对碳纤维布约束高强混凝土方柱的应力-应变关系进行了试验研究。考虑了碳纤维布用量、粘贴方式、纤维布条带间距等因素对约束效果的影响．结果给出了碳纤维布约束高强混凝土方柱峰值应力和峰值应变的计算公式及其应力-应变关系模型．结论不论是纤维布条带包裹，还是纤维布完全包裹的试件，加固后高强混凝土柱体的抗压强度都有一定的提高；其中纤维布用量增大时，抗压强度增强；全包试件比条带式包裹承载力增强效果显著．加固后试件的应力-应变曲线的下降段趋于平缓，延性有所提高．但破坏时仍具有较大的脆性．

Analytic Models for High-Strength Concrete Square Columns Confined By Carbon Fiber Reinforced Polymer

In order to study the performances and the basic born capabilities of high strength concrete members bonded with CFRP(carbon fiber polymers),stress-strain relationship should be determined.Experiments on the relationship between stress-strain of high strength concrete columns are carried out through nine group members with different strengthening schemes,which have taken several factors into account,such as the amount of CFRP,bonding methods,space between CFRP strips.Based on the analysis of the experiments,the stress-strain relationship of high strength concrete columns bonded with CFRP is given,together with some conclusions being drawn as follows.Compressive strength of high strength concrete columns externally bonded with CFRP has increased to a certain extent,whether they are bonded with CFRP strips or sheets,and enhances with the increasing amount of CFRP.Simultaneously,the scheme of strengthening with CFRP sheets has much more distinct effect than that with CFRP strips.The stress-slip relation of CFRP strengthened members is gently descending,behaving in a much more ductile way but still with a great deal of brittleness at failure.