CFRP加固钢筋混凝土十形柱压弯承载力试验研究

研究碳纤维布(CFRP)加固钢筋混凝土十形柱的受力和变形性能,分析碳纤维粘贴量和配筋率对其抗压弯承载力的影响,并且探讨构件截面几何参数、材料强度、材料用量等与十形截面柱抗压弯承载力之间的定量关系。通过相同截面不同配筋量和碳纤维布粘贴量的试件进行单调一次短期加载对比试验,分析各因素对构件承载力和延性等的影响;运用力的平衡和材料的本构关系建立了构件承载力计算的力学模型。得到具有对比性的荷载-柱中挠度、材料应变-荷载的关系曲线并进行分析;得出碳纤维布加固钢筋混凝土十形截面柱正截面抗压弯承载力计算公式。采用碳纤维布加固钢筋混凝土十形截面柱以提高其正截面抗压弯承载力是可行的,十形截面柱加固的承载力计算公式对类似的工程设计问题具有借鉴作用。

EXPERIMENTAL STUDY ON LOAD-CARRYING CAPACITY FOR CFRP STRENGTHENED REINFORCED CONCRETE ECCENTRICALLY-COMPRESSED CROSS COLUMNS

This paper aims to study the stress and distorted performance of reinforced concrete cross columns strengthened with CFRP,and discusses the quantitative relation among the component section,geometric parameter,materials strength,material usage,compressing and bending resistance bearing capacity of the cross columns.According to the contrast test of a monotone short period loading on specimens with identical section and different ratio of reinforecement and CFRP sheets,analyse the influencing factors of the structure bearing capacity and ductility,etc;and the relation between force balance and material constitutive relationship is used to,establish the mechanical model of calculating the structure bearing capacity.In response to the experimental results,the contrast relational curves including load-column deflection,material strain-load are got and the formula to calculate the bearing capacity of reinforced concrete cross columns strengthened with CFRP.The reinforced system is feasible to increase right section,compressive and bending bearing capacity of the normal section.This formula may be a reference for design of similar projects.