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双语推荐：BFRP筋

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针对玄武岩纤维增强树脂基复合筋（ BFRP）在混凝土环境中的耐碱性能进行了加速腐蚀试验研究．腐蚀试验环境包括3种，分别为自来水、盐水及室内空气环境，将包裹有混凝土保护层的BFPR筋试件分别放置在上述3种环境中，试验同时采用碱溶液直接浸泡BFRP筋作为对比，对直接碱溶液浸泡环境与混凝土包裹环境之间的加速系数进行了研究．试验采用60℃的高温进行加速．试验结果表明：自来水和盐水浸泡对于包裹有混凝土的BFRP筋试件没有明显差异．分析认为，与混凝土内部高碱性的孔隙溶液接触是BFRP筋退化的主要原因，当经受高温和高湿环境共同作用时，混凝土环境中BFRP筋的退化将明显加速；BFRP筋的退化速率在初期较快，随着龄期的增长，退化速率降低．基于试验数据分析表明，对于所采用的BFRP筋，60℃饱和吸湿混凝土环境下，BFRP筋2．18 a的退化程度与60℃碱溶液直接浸泡环境下1 a的退化程度相当．
This paper presents an experimental study on the alkali-resistant properties of basalt fiber reinforced polymers BFRP bars under a typical concrete environment.BFRP bars were embedded in concrete and exposed to different aggressive environments including tap water saline solution and ambient temperature environments to study the effects of the type of solution and relative humidity RH on the durability of BFRP.Meanwhile BFRP bars were directly immersed in an alkaline solution for comparison. The acceleration factor describing the relationship between the alkaline solution immersion and the moisture-saturated concrete was also obtained.Aging was accelerated with a temperature of 60 ℃.The results show that the chloridion in the saline solution does not have any harmful effects on the degradation of the concrete-encased BFRP bars.Contact with an alkaline high pH concrete pore-water solution is the primary reason for the degradation of the BFRP bars.The degradation rate of concr

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为了研究经历长期持荷后的玄武岩纤维增强聚合物(BFRP)筋钢纤维高强混凝土梁在重复荷载作用下的变形性能,进行了7根BFRP筋钢纤维高强混凝土梁的受弯试验,分析BFRP筋配筋率、钢纤维体积率以及加载水平等因素对梁的变形性能的影响。结果表明:经过10次卸载、加载循环后,受力BFRP筋与混凝土之间的黏结性能没有发生退化;荷载水平、钢纤维掺量及BFRP筋配筋率对BFRP筋钢纤维高强混凝土梁的加载-卸载挠度曲线及挠度恢复能力有不同程度的影响;BFRP筋钢纤维高强混凝土梁具有较高的变形恢复能力和良好的抗重复荷载性能。
In order to study the deformation performance of steel fiber reinforced high-strength concrete beams with BFRP rebars, the bending test of 7 beams under repeated load after suffering long-term sustaining load were carried out.The effects of reinforcement ratio of BFRP bars , fraction of steel fiber by volume and loading level on deformation performance of beams were analyzed .The results shown that the bonding behavior between BFRP rebars and concrete is not degradative after 10 loading-unloading cycles;the factors,including loading level , the dosage of steel fiber and the reinforcement ratio of BFRP , express the different levels of influence on the load-deflection curve and the deflection recovery capability of test beams;and steel fiber reinforced high-strength concrete beams with BFRP rebars possess higher deflection recovery capability and better repeated load resistance .

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为了准确计算玄武岩纤维增强复合材料(BFRP)加固损伤混凝土梁的挠度,为BFRP加固损伤混凝土梁的设计与施工提供理论依据,按照配筋率不同设计了11片试验梁进行试验,每组试验梁设置不同的BFRP布加固量与加载方法。计算了各试验梁的荷载-挠度曲线,分析了未加固梁、1层BFRP布加固梁、2层BFRP布加固梁在不同初始荷载下的挠度变化规律。给出了BFRP加固损伤混凝土梁跨中挠度的计算公式,对比了挠度计算值与实测值。分析结果表明:BFRP加固混凝土梁的挠度受初始荷载和加固量的影响,有初始荷载的加固梁挠度较无初始荷载的加固梁挠度增大30%~94%,2层BFRP布加固梁的挠度较1层加固梁的挠度增大19%~42%,计算挠度时需考虑BFRP布滞后应变的影响;挠度计算值与实测值的最大差值平均为7.26mm,初始荷载小与配筋率高的试验梁挠度计算值与实测值较为接近,可以用于实际工程计算。
In order to accurately calculate the deflection of damaged concrete beam strengthened with basalt fiber reinforced plastics(BFRP)and provide theoretical foundation for the design and construction of the beam,according to different reinforcement ratios,eleven test beams with different amounts of strengthened BFRP sheet and loading methods were designed.The load-deflection curves of different test beams were obtained.Under different pre-loading programs, the changing rules of deflection of un-strengthened beams,strengthened beams with one layer and two layers of BFRP sheet were analyzed respectively.The calculation formulas of mid-span deflection of damaged concrete beam strengthened with BFRP were presented,and the calculated deflections and measured values were compared.Analysis result indicates that the deflections of damaged concrete beams strengthened with BFRP are influenced by initial load and amount of BFRP sheet layer.The deflections of strengthened beams with initial

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针对钢筋锈蚀在工程加固领域中带来的严重安全生产问题,应用具有极强耐腐蚀性的新型玄武岩增强塑料(BFRP)筋,内嵌加固混凝土梁结构。制作7根混凝土梁进行静力加载试验,研究采用不同直径、加固数量的BFRP筋加固试件的受力性能,对其受力过程、破坏形态、承载力、变形和裂缝发展情况进行分析。结果表明,采用新型BFRP筋对混凝土结构进行加固可以有效增加结构的开裂载荷与极限载荷,开裂载荷提高73.88%~165.01%,极限载荷提高62.16%~72.90%;且有效减小加固构件的变形,延缓裂缝开展。但并不是加固筋材数量越多加固效果越好。BFRP筋可以推广应用在易受腐蚀地区代替钢筋进行结构加固工作。
Aiming at the serious production safety problems caused by corrosion of steel in the field of engineering reinforcement ,new basalt fiber reinforced plastics (BFRP) tendons was applied to reinforce concrete beams. Seven concrete beams under monotonic loads were tested. Behavior of concrete beams strengthened with different diameter and number of BFRP tendons were studied. Based on tested values of concrete beams strengthened with new BFRP tendons,the stressing process,failure capacity, flexural capacity,deformation and crack distribution were studied.The test shows that strengthening technique using new BFRP tendons bonding in concrete cover can enhance the first-crack load and steel-yielding load of beams compared with the ordinary beam,the crack loads increased by 73.88%to 165.01%,the limit bearing capacities increased by 62.16%to 72.90%. The BFRP tendons can limit the crack width all the way up to failure and reduces deformation of reinforcement effectively. The reinforcement effect

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介绍了一种钢筋混凝土梁抗剪加固的新方法--ETS 法，并对16根钢筋混凝土短梁进行了试验研究，探求 ETS 法的可行性。对比了 BFRP 筋绑扎、BFRP 筋灌胶（ETS 法）、普通钢筋绑扎插入式三种加固的试件与未加固试件的抗剪性能；通过加固筋的应变，研究了加固筋的利用率。研究结果表明：钢筋混凝土短梁采用 ETS 法加固后，加固筋的存在延缓了试件裂缝的发展，提高了开裂荷载和抗剪承载力，减小了短梁的跨中挠度，表现出良好的受力和变形性能。
The Embedded Through-Section (ETS) which is a new reinforced method of concrete beam to improve the shear capacity is introduced. 16 RC short beams are tested to certify the feasibility of the reinforced method. The shearing capacity between the reinforced specimens strengthened with assembling BFRP bars, epoxy wrapping BFRP bars (ETS) and assembling rebars and the unreinforced ones were compared in the test. Utilization of reinforcing bars are showed by the strain data. The results indicate that the reinforced bars can delay the development of cracking, improve the cracking load and the shear capacity of the beam. At the same time the mid-span deflection of short beam is reduced. The RC short beams strengthened by ETS method show good mechanical and deformation properties.

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运用ABAQUS有限元软件,建立了基于弹性地基双层板模型和裂缝模式下的玄武岩纤维筋连续配筋复合式路面荷载应力有限元模型,提出用粘结单元定义裂缝接触面的法向和切向接触本构行为,即用裂缝剪切刚度来模拟裂缝间的嵌锁作用。通过分析确定了不同裂缝间距下复合式路面的临界荷位——纵向自由边中部,并比较了BFRP筋和钢筋两种配筋条件下混凝土板应力随AC层厚度、CRC层厚度、筋位置、配筋率及裂缝剪切刚度的变化规律。计算结果表明,2种配筋条件下混凝土板应力值随参数变化规律相似,应力值基本相等,这为BFRP筋应用于CRC＋AC复合式路面提供了理论依据。
In this paper,the finite element software ABAQUS is used to build the load stress mod-el about BFRP(basalt fiber reinforced polymer)continuously reinforced composite pavement.The model is based on the double panel model on the elastic foundation and the cohesive element is applied to define the normal and tangential contact constitutive behavior of cracks,in another word,the joint shear stiff-ness is used to simulate interlock action between cracks.Through a mass of analysis,the middle of longi-tudinal free edge is found out as the critical load position under different transverse crack spacing.In both cases of BFRP reinforcement and steel reinforcement,the influence of the thickness of AC and CRC layer,bar distribution,reinforcement ratio,joint shear stiffness on the concrete slab stress is discussed. The calculation results indicate that the value and change law of concrete slab stress is similar,which provide theoretical foundation for the BFRP applied to CRC +AC composite

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通过在钢管外部缠绕玄武岩纤维增强复合材料(BFRP)对钢管混凝土进行修复加固,能有效地提高构件的极限承载力、增加构件的延性、耐腐蚀性。通过对BFRP加固钢管混凝土的试验研究,分别对4个用BFRP纤维布缠绕加固和3个未加固钢管混凝土进行轴压试验,并通过荷载-位移曲线、荷载-应变曲线进行分析。结果表明:用BFRP缠绕加固的试件轴压破坏形态为BFRP拉断,钢管屈曲;用BFRP加固试件的承载力比未加固试件提高了17.3%,同时增加了试件的延性;未加固与加固试件轴压承载力的试验结果与理论计算结果的偏差较小,验证了理论计算的准确性。
Wrapping BFRP sheets on the steel tube can effectively increase the axial capacity and improve the ductility and durability of concrete-filled steel tubes ( CFST) .This paper presented an experimental study on the axial compressive capacity of the CFST wrapped with BFRP sheets .Four CFST specimens wrapped with BFRP sheet and 3 plain CFST specimens were tested under axial loading , which were analysed by the load -displacement curves and load -strain curves .The experimental results show that 4 strengthened specimens were failed by BFRP rupturing after steel tube buckling .The axial capacity of the CFST was improved by 17.3%through wrapping BFRP and the ductility of the CFST was improved as well .The good agreement between the experimental axial capacity and the analytical results confirms the validity of the theoretical analysis .

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为了研究BFRP布用量对混凝土短柱轴心抗压性能的影响,进行了单向轴心抗压试验和数值模拟研究。研究结果表明,随着BFRP布用量的增加,混凝土短柱的轴心抗压强度均有不同程度提高;采用ANSYS有限元分析软件能较好地模拟BFRP布约束混凝土短柱的轴心抗压强度。
In order to study the affection of the amount of BFRP sheets on the axial compressive strength of confined concrete short column, the uniaxial compressive test and numerical simulation are carried out. The results indicate that with increasing of the amount of BFRP sheets, the axial compressive strength of confined concrete short columns increase in different degree. And the axial compressive strength of confined concrete short column can be well simulated by using ANSYS finite element analysis software.

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在试验的基础上,采用ANSYS对BFRP约束素混凝土方柱强度对加固效果的影响作了研究,并将ANSYS分析得出的强度与试验结果进行了比较。分析结果表明:通过合理选择有限元分析数值模型,可较好地预测纤维布加固混凝土柱的轴心受压性能,且分析所得强度与试验吻合良好。
Based on experiments, the strengths and influ-ence of size effection to reinforcement effect of square concrete columns confined by BFRP were studied by ANSYS and the strengths analysised by ANSYS were compared with experimental ones. The results suggest that uniaxial compressed properties of specimens were predicted well by choosing finite element analysis model reasonably. The strengths had a good degree of agreement with experimental datas and square concrete columns of different sizes exist apparent size effection.

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FRP作为一种新兴材料,其在实际结构疲劳加固中的应用随着价格的降低而飞速发展。主要介绍了国内外关于不同FRP布加固钢筋混凝土梁弯曲疲劳性能的试验研究与理论分析,结合课题组进行的玄武岩纤维布(BFRP)加固RC梁试验情况,为今后FRP布加固RC梁弯曲疲劳性能的研究方向提出几点建议,有利于该学科的发展。
As a new material,FRP has been rapidly finding wider and wider applications in actual structural fatigue reinforce-ment as its price drops.The present paper mainly focuses on introducing the experimental studies and theoretical analyses of the flexural fatigue behavior of RC beams strengthened with different FRP sheets both at home and abroad.With the experiments on RC beams strengthened with BFRP sheets performed by our group as practical examples,put forward in the paper are some useful suggestions on the future orientation of the study of the flexural fatigue behavior of RC beams strengthened with FRP sheets,which may favor the development of the subj ect in the future.

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