Shear capacity of reinforced concrete columns strengthened with CFRP sheet

INTRODUCTION There is increased need in recent years for strengthening or rehabilitation of existing reinforced concrete structures adversely affected by overloading, construction material deterioration, seismic loads, structural deformation, etc. An effective method for increasing the shear capacity of reinforced concrete columns is the use of externally bonded carbon fiber reinforced plastic (CFRP) systems (ACI, 2002). FRP systems were first applied to reinforced concrete col-umns i…     

预应力碳纤维加固技术的研究进展

文章概述了预应力碳纤维加固结构的优点和国内外的研究状况,展望了该技术的发展前景,提出了自己的建议。     

碳纤维片材加固技术在某工程框架梁抗剪加固中的应用

粘贴碳纤维片材加固技术是一项新的应用外粘高性能复合材料加固结构的技术．碳纤维片材重量轻、高强度、高弹性、高耐久性，易于施工，现已开始应用于各类混凝土结构的加固处理．本文根据工程实际情况，简要介绍了碳纤维片材加固技术在混凝土框架梁抗剪加固工程中的应用．     

CFRP加固钢筋混凝土梁抗弯承载力的计算机仿真与试验分析

文章通过ANSYS大型通用有限元软件对CFRP加固钢筋混凝土梁抗弯承载力进行仿真分析,并将得出的仿真结果与参考文献的试验结果进行对比,得出了结论。     

CFRP 加固技术在工程中的应用

碳纤维加固法具有高强度、抗腐蚀、轻质高效特点,由于碳纤维加固后的混凝土板是碳纤维构成的复合受力新体系,其各部分的受力分析、整体承载力、刚度的计算、结构的破坏模式及纤维的增强机理等又形成了混凝土板纤维加固技术中理论难点。本文对某厂大尺度混凝土楼盖开裂情况进行检测,介绍了开裂楼盖的碳纤维补强加固技术,分析了其可靠性和适用性。     

CFRP加固混凝土构件轴压性能试验分析

采用CFRP(carbon fiber reinforced polymer,碳纤维增强复合材料)环绕包裹混凝土棱柱体进行轴压强度试验。该试验研究包裹方式、层数以及原混凝土强度对构件轴压强度的影响,并在此基础上,通过统计分析的方法得到了轴压强度随各影响因素变化的定量计算公式。试验结果表明,CFRP环绕包裹混凝土对轴压强度有一定的提高作用;在保证施工材料和工艺质量的前提下,可以考虑采用仅在最外层搭接的包裹方法,既可有效提高混凝土构件的轴压强度,也能在一定程度上减少CFRP用量。专题试验表明,该定量计算公式有一定的可靠性,可用于定量计算CFRP包裹对混凝土轴压强度的提高作用。     

树脂浓度对三维针刺CFRP复合材料显微结构的影响

以三维针刺碳毡作为预制体,采用树脂浸渍-热压固化工艺快速制备了碳纤维增强树脂基复合材料(Carbon fiber reinforced polymer,CFRP)。通过光学和扫描电子显微镜观察了材料的显微结构,使用阿基米德方法测定材料的密度和气孔率,并利用压汞仪分析了材料的孔隙分布。主要研究了树脂浓度对CFRP复合材料显微结构的影响,结果表明,当树脂浓度由1.0增大到1.8时,材料的开气孔率由9%降低为3%,密度由1.40 g/cm3增大到1.45 g/cm3。树脂浓度1.0所制得CFRP-1材料束间孔隙尺度较大,但其他区域均比较致密;而树脂浓度增大到1.8所制得的CFRP-2材料更为致密,但由于热压固化过程残余的热应力未能及时释放,CFRP-2材料包含纤维-基体界面脱粘和纤维束内部的贯穿裂纹。     

浅谈土木工程中碳纤维复合材料的应用

纤维增强塑料（FRP）是土木工程应用的热点,而碳纤维（CERP）以其良好的物理力学性能使其应用最广泛、最成熟,本文对CFRP在土木工程中应用给以总结,并进一步指出目前存在的问题。     

碳纤维约束钢筋混凝土短柱轴心受压性能研究

碳纤维增强塑料(Carbon Fiber Reinforced Plastics),简称CFRP,是一种新型的工程建筑材料。本文对CFRP约束钢筋混凝土短柱在轴心受压状态下的力学性能进行了试验研究,并和普通螺旋箍筋短柱的力学性能进行了对比,结果表明:CFRP约束混凝土柱在轴心受压情况下,可以大大提高构件的承载能力。     

Numerical Determination of Shear Strength of Steel Reinforced Concrete Column Strengthened by CFRP Sheets

The earthquake-resistant property of reinforced concrete members depends on the interaction between reinforcing bars and surrounding concrete through bond to a large degree,In this paper a general system aimed at dealing with the failure analysis of reinforced concrete columns strengthened with carbon-fiber-reinforced plastic(CFRP) sheets including bond-slip of the anchored reinforcing bars at the foot of the columns is presented.It is based on the yield design theory with a mixed modeling of the structue,according to which the concrete material is treated as a classical two-dimensional continuum ,whereas the longitudinal reinfocing bars are regarded as one-dimensional rods including bond-slip at the foot of the columns,In shear reinforced zones both the shear CFRP sheets and transvers reinforcing bars are incorporated in the analysis throuth a homogenization procedure and they are only in tesion ,The approach is then implemented numerically by means of the finite-element formulation,The numerical procedure produces accurate estimates for the loading-carrying capactiy of the shear members taken as an illustrative application by correlation with the experimental results,so the proposed approach is valid.