Tensile Strength Characteristics of GFRP Bars in Concrete Beams with Work Cracks under Sustained Loading and Severe Environments

To investigate the effect of different environmental conditions of GFRP bars in concrete beams with work cracks subjected to sustained loads, the beams were exposed in indoor, freeze/thaw cycles and immersed in alkaline solution at elevated temperature. The bars were carefully extracted from the beams and tested in order to evaluate residual tensile properties. The results show that the tensile strength decreased significantly in the highly aggressive conditions but not in the natural conditions. The effect of GFRP bars casting in concrete beams demonstrated approximately 2.5% decrease of tensile strength caused by pore water environment in concrete beams on basis of those of the original bars. The effect of sustained loading plus work cracks demonstrated about 10.5% tensile strength decrease on basis of those of the bars only casted in concrete beams. The effect of environments under sustained loading plus work cracks demonstrated about 17% tensile strength decrease caused by a saturated solution of Ca（OH）2 and 60-2 ℃ tap water （pH=12-13） and about 8% tensile strength decrease caused by freezing and thawing cycle （F/T）, both on basis of those of the bars of the indoor beams only under sustained loading plus work cracks. The results demonstrate the effects of the tensile strengths under different environmental conditions of GFRP bars in concrete beams with work cracks subjected to sustained loads.

Fracture characteristics and ductility of cracked concrete beam post-strengthened with CFRP Sheet

The present paper concerns the fracture characteristics and ductility of cracked concrete beam externally bonded with carbon fiber-reinforced polymer (CFRP) sheet as well as the integration behaviors between CFRP/concrete interfacial debonding and concrete cracking.Three-point bending tests were carried out on the CFRP-strengthened cracked concrete beams with varying specimen depth and initial crack length.A straingauge method was developed to monitor the crack initiation and propagation in concrete,and the CFRP/concrete interfacial bonding behaviors,respectively.Clip gauges were used to measure crack mouth opening displacement (CMOD) and the deflection at midspan.Experimental results revealed that CFRP-strengthened specimen shows a higher load capacity under the same deformation level and a better inelastic deformation capacity compared with the unstrengthened one.For there are two manifest peak values in the obtained load versus displacement curve,the ductility of CFRP-strengthened concrete beams were investigated using index expressed as area ratio on the load versus displacement curve.The calculated results indicated that the contribution from CFRP sheet to the ductility improvement of specimen is notable when the deflection at midspan exceeded 10.5 times the first-crack deflection.

PEELING-OFF PHENOMENON IN FRP STRENGTHENED CONCRETE BEAMS DUE TO THERMAL RESIDUAL STRESS

Peeling-off phenomena in FRP strengthened concrete beams are investigated in this paper. Based on the beam theory and the fracture mechanics, a new theoretical model is proposed to analyze the peeling-off behavior near FRP-concrete interfaces, which is governed by residual thermal stresses. Numerical examples are presented to provide a clear insight into the failure mechanism. Some suggestions are provided for the optimal design of FRP strengthened structures.

Crack elongation and its width of large depth reinforced concrete beams

In order to meet the requirement of structural inspection,the crack spacing and crack width at various heights in the tensile zone of six large depth reinforced concrete beams were measured under several loading levels of serviceability state.The effects of the depth of normal section beams on the crack spacing and crack width were analyzed,and the modified model is proposed for calculating the average crack spacing by thinking about the depth of normal section,the reinforcement arrangement and the effective reinforcement ratio.The relationships of crack widths at any position in the tensile zone and at the reinforcement level on the side surface of beam were studied.By theoretical and statistical analysis,a method is proposed to calculate the ratios of crack widths between any position and the reinforcement level on the side surface of large depth reinforced concrete beams.

FRP筋混凝土短梁抗剪性能试验研究及承载力计算

为分析梁高、剪跨比、腹筋率等参数对纤维增强聚合物(FRP)筋混凝土短梁抗剪承载力的定量影响,并验证前期基于拉杆拱模型提出的抗剪承载力计算方法的科学合理性,对11根玄武岩FRP筋混凝土短梁开展了剪切破坏试验,试验梁最大梁高为1.2 m.试验结果表明,梁高、剪跨比、水平腹筋率、竖向腹筋率均对FRP筋混凝土短梁的抗剪承载力有显著影响.当梁高由300 mm增大到1200 mm,试验梁的无量纲极限抗剪强度下降46.7%.当水平腹筋率由0增大至1.0%,试验梁的无量纲极限抗剪强度提高40.5%.基于拉杆拱模型提出的抗剪承载力计算式可以合理反映梁高、剪跨比、水平腹筋率等因素的影响规律,计算结果与本试验结果及搜集试验数据均吻合良好.

CFRP-PCPs复合筋加固钢-混组合梁负弯矩区抗裂试验与理论计算

为解决钢-混组合梁负弯矩区混凝土板易开裂而造成刚度减弱的行业难题,以预制的CFRP-PCPs(carbon fibre reinforced polymer-prestressed concrete prisms)复合筋作为中支座的腹筋,并以复合筋的数量、预应力张拉水平和截面尺寸为主要参数设计制作了五根复合筋钢-混组合连续梁和一根普通组合连续梁,研究其在单跨单点荷载下负弯矩区的抗裂性能。结果表明:复合筋能显著增强中支座截面刚度,对负弯矩区的裂缝控制能力提升显著;与普通组合梁相比,复合筋梁的开裂荷载提高近30%,裂缝数量与裂缝宽度减少近50%;复合筋面积是提高裂缝控制能力的主要因素,预应力水平和截面尺寸对开裂荷载的影响较弱;复合筋的开裂荷载与预应力水平、面积正相关,其中预应力水平是影响复合筋效用时长的关键因素。基于现有理论和试验数据,本文提出CFRP-PCPs复合筋钢-混组合梁负弯矩区开裂荷载和复合筋的开裂荷载计算公式,计算结果与试验值较为吻合,可为复合筋在钢-混组合梁桥实际工程中应用提供参考。

FRP筋-钢筋混合配筋的超高性能混凝土梁受弯有限元分析

研究配筋率、混合配筋等效配筋率、FRP筋面积比、UHPC抗拉强度、钢筋配置形式对UHPC梁受弯性能的影响。分析各参数对UHPC梁屈服荷载、峰值荷载、挠度及破坏形式的影响。结果表明:随着配筋率的增加,纯钢筋UHPC梁刚度、屈服荷载、峰值荷载及对应的挠度均得到不同程度提高;UHPC混合配筋梁随FRP筋面积比的增大,峰值荷载及峰值荷载挠度增大,UHPC混合配筋梁的抗变形能力变差;随UHPC抗拉强度的提升,UHPC梁的开裂荷载、屈服荷载和峰值荷载增大,对应的挠度减小;采用双层布置的UHPC混合配筋梁比单层布置梁屈服荷载、峰值荷载小。本文为FRP-钢筋混合配筋UHPC结构的工程应用提供参考。

Flexural behaviors of FRP strengthened corroded RC beams

The flexural behavior of eight FRP （ fiber reinforced polymer） strengthened RC （reinforced concrete） beams with different steel corrosion rates are numerically studied by Ansys finite element software. The influences of the corrosion rate on crack pattern, failure mechanism, ultimate strength, ductility and deformation capacity are also analyzed. Modeling results show that the beams with low corrosion rates fail by the crushing of the concrete in the compression zone. For the beams with medium corrosion rates, the bond slip between the concrete and the longitudinal reinforcement occurs after steel yielding, and the beams finally fail by the debonding of the FRP plates. For the beams with high corrosion rates, the bond slip occurs before steel yielding, and the beams finally fail by the crushing of the concrete in the compression zone. The higher the corrosion rates of the longitudinal reinforcement, the more the carrying capacity of FRP strengthened RC beams reduces. The carrying capacity of RCB-1 （the corrosion rate is 0） is 115 kN, and the carrying capacity of RCB-7 （the corrosion rate is 20% ） is 42 kN. The deformation capacity of FRP strengthened corroded RC beams is higher than that of FRP strengthened uucorroded RC beams. The ultimate deflection of RCB-1 and RCB-7 are 20 mm and 35 nun, respectively, and the ultimate deflection of RCB-5 （the corrosion rate is 10% ） reaches 60 ilUn.

基于试验数据分析的FRP筋混凝土梁抗弯承载力预测方法

新型纤维增强复合材料(FRP)被视为一种可取代钢筋的理想增强材料,在岛礁及近海工程中得到广泛应用。参照相关规范的参数规定及基本假定,对国内外89根FRP筋混凝土梁的试验数据进行统计分析,引入无量纲化参数μp,建立了一种基于试验数据分析的抗弯承载力预测方法,并与我国现行规范中的计算方法进行对比分析,验证了本文提出预测方法的可靠性和预测精度。结果表明:基于试验数据分析的FRP筋混凝土梁抗弯承载力预测结果与试验结果吻合较好,M_(pre)/M_(exp)平均比值为0.96~1.03,为FRP筋混凝土梁极限承载力评估提供了一种新途径。

FRP筋混凝土梁抗剪性能研究综述

作为一种新兴的高性能材料,纤维增强复合材料(FRP)筋由于高强、耐腐蚀等优点,已经成为传统建筑材料的重要补充,正逐步应用于土木工程领域。因此,FRP筋与混凝土相结合将是未来土木工程领域的热点问题,但是目前对FRP筋混凝土梁的抗剪机理并没有统一的理论,这大大限制了FRP筋在实际工程领域的应用和推广。本文通过对国内外相关研究成果及规范的追溯,从试验研究、数值模拟和理论分析三方面梳理了FRP筋混凝土梁抗剪性能的研究成果,总结了不同研究对象、研究方法下得到的抗剪承载力计算公式,以期为今后FRP筋混凝土梁抗剪的研究与设计提供参考和建议。

基于解析方法的FRP增强混凝土梁失稳前断裂过程分析

为研究FRP增强混凝土梁失稳前断裂过程,该文基于混凝土断裂力学理论和非线性FRP-混凝土界面粘结滑移规律,建立了一个跨中裂缝导致界面脱粘的粘聚区模型,采用解析方法推导了FRP增强混凝土梁界面剪切应力、FRP拉应力以及失稳前断裂韧度的公式,为分析FRP-混凝土界面脱粘提供了一种有效的方法,并开展了动态荷载下4种不同初始缝高比(0.2、0.3、0.4和0.5)的FRP增强混凝土梁三点弯曲试验。结果表明,FRP增强混凝土梁的起裂荷载和阻裂荷载随着初始缝高比的增大而逐渐减小,但初始缝高比为0.4时,试件起裂最晚;起裂韧度和阻裂韧度不随初始缝高比的变化而变化,表现出与其他文献类似的规律,验证了断裂韧度解析解的正确性。

FRP筋-钢筋混杂配筋混凝土梁受弯性能试验研究与有限元分析

通过FRP筋-钢筋混杂配筋混凝土梁受弯性能试验,分析混杂配筋梁的受弯性能.混杂配筋混凝土梁的荷载-挠度曲线分为3个阶段,混凝土梁的开裂荷载和钢筋屈服荷载为3个阶段的分界点;混杂配筋混凝土梁的极限承载能力高于普通混凝土梁.按等弹性模量换算名义配筋率ρ_(2)相同时,A_(f)/A_(s)增大;按等强度换算名义ρ_(1)增大,混凝土开裂后梁的刚度增加,钢筋屈服后梁的塑性变形能力提高,对梁破坏有更明显的预警,且极限承载能力和挠度均有所增加;采用ABAQUS有限元软件可以准确地模拟FRP筋-钢筋混杂配筋混凝土梁受弯性能.

FRP与混凝土组合结构研究综述

本文从FRP约束混凝土的试验研究、FRP约束混凝土柱的强度模型、其他形式的FRP与混凝土组合结构三方面阐述FRP与混凝土组合结构的研究现状,并提出现阶段需要继续深入的一些问题。

基于数据库的无腹筋FRP筋混凝土梁受剪承载力误差分析

基于国内外已发表文献中的受剪承载力试验数据,建立了样本容量为461的无腹筋FRP筋混凝土梁受剪承载力试验数据库.综合分析了混凝土抗压强度、梁宽度、梁有效高度、剪跨比、FRP筋配筋率以及FRP筋弹性模量等6个因素对无腹筋FRP筋混凝土梁受剪承载力的影响,并对各规范建议公式以及各修正计算公式预测效果进行评价.结果表明,各计算方法对尺寸效应和剪跨比的考虑并不一致,均存在不同程度的保守计算,各因素与受剪承载力之间存在较好的相关性.在各规范建议公式中,CSA/CAN-S806-2012的预测效果较为准确,ACI440.1R-2015的预测效果最为保守,CNR-DT203-2006的安全度最低.在各修正计算公式中,Ahmed-2021的预测效果较为准确,Alam-2013最为保守,Mari-2014的安全程度最低.

MODIFICATON AND RESEARCH ON BENDING RIGIDITY FORMULA OF REINFORCED CONCRETE BEAM

Beam stiffness degrades with its age in service and its service performance is weakened.According to the fundamental characteristics of the reinforced concrete,the influence of stiffness degradation caused by different kinds of damage is obtained.Among them,the crack is the most direct and obvious factor.Furthermore,according to the analysis of bending rigidity formula presented in current standard,an influence parameter of crack development on the stiffness degradation,i.e.,nonuniformity coefficient of tensile steel strain φ,is extracted.Average crack distance and crack depth are taken as crack statistic parameters.Based on analysis and modeling with ANSYS,the modified bending rigidity formula related to crack is obtained.

芯钢管连接的PVC-CFRP管混凝土柱-RC梁边节点抗裂承载力研究

为研究芯钢管连接的PVC-CFRP管混凝土柱-RC梁边节点的抗裂性能,文中以芯钢管含钢率、节点配箍率、轴压比、梁纵筋配筋率和CFRP条带间距为设计参数,对11根节点试件进行低周反复荷载试验,观察其裂缝发展过程,分析各参数对其初裂荷载的影响。试验结果表明:节点在加载过程中先后经历了初裂、通裂、峰值和破坏阶段,初裂荷载约为极限荷载的40%~50%,随着节点核心区表面斜裂缝的出现,试件荷载-位移滞回曲线逐渐偏离线性。与普通节点相比,内置芯钢管可有效提高节点的初裂荷载,同时,随着节点配箍率和轴压比增加,节点初裂荷载有所提高,芯钢管含钢率、梁纵筋配筋率以及CFRP条带间距对节点初裂荷载影响不明显。最后,基于节点核心区的受力分析,引入节点箍筋影响系数,提出节点抗裂承载力计算公式,与试验值吻合良好,此外,与目前已有节点抗裂承载力计算模型对比,文中公式更适用于芯钢管节点抗裂设计。

Analysis of Shear Failure in Reinforced Concrete Beams without Stirrups

This paper deals with flexural concrete members reinforced longitudinally but without transverse reinforcement. The conducted experimental investigations have shown that beams without web reinforcement may fail without attaining their full flexural capacity and then shear governs their failure. In the paper, there are presented recent results of the author＇s own experiments, which aimed at disclosing some aspects of the propagation of cracks in longitudinally reinforced concrete beams without stirrups. The experimental program has been designed especially to investigate the influence of the shear span-to-depth ratio on diagonal crack propagation and load carrying capacity of tested beams.

FRP筋再生混凝土梁受弯性能试验研究

为了研究FRP筋再生混凝土(RAC)梁受弯性能,试验制作八根FRP筋再生混凝土梁(其中GFRP筋和BFRP筋再生混凝土梁的数量分别为六根和两根),通过四点弯曲试验研究再生骨料(RA)替代率与FRP筋类型对梁破坏模式、挠度和承载力等性能的影响。试验结果表明:(1)梁的开裂荷载和极限承载力均随着再生骨料替代率的增加而下降,且破坏模式也逐渐由正截面混凝土受压破坏转为斜拉破坏;(2)BFRP筋弹性模量的提高使梁的混凝土受压区高度增加,正截面承载力增加,而斜截面承载力提高较少,从而使BFRP筋再生混凝土梁发生斜拉破坏;(3)规范计算得到的FRP筋再生混凝土梁承载力安全储备略显不足,建议实际配筋率为平衡配筋率ρfb的1~1.5倍时,设计值取规范计算值的0.8倍;(4)GB与ACI挠度计算值均与试验值拟合程度较好,能很好地预测FRP筋再生混凝土梁的挠度值。

既有RC梁开洞后的力学行为及FRP加固效应分析

实际建筑工程中,存在将管线穿过钢筋混凝土(RC)梁的工程需求,从而起到节省室内空间、减轻结构自重等多重作用。因此,对既有RC梁开洞后的力学性能进行研究具有重要的现实意义。利用有限元软件LS-DYNA对不同加载工况(包括均布和集中加载)和孔洞特征(包括孔洞数量和尺寸)下开洞钢筋混凝土(RC)梁的破坏形态和荷载-位移曲线等力学性能进行了研究,并对纤维增强复合材料(FRP)对开洞RC梁力学性能的加固效应进行了分析。结果表明:均布荷载作用下,开洞RC梁主要在支座处发生弯剪破坏,而跨中孔洞对RC梁的力学性能影响较小;在跨中集中荷载作用下,开洞RC梁均在跨中孔洞处发生剪切破坏,且随着孔洞数量和尺寸的增大,开洞RC梁的承载能力和变形能力均呈现降低趋势;采用FRP对开洞RC梁进行加固后,其承载能力和变形能力均得到显著提升。

基于宏观模型的FRP筋纤维混凝土梁拉伸刚化效应研究

在混凝土中添加纤维能有效控制纤维增强聚合物(Fiber Reinforced Polymer, FRP)筋混凝土梁的裂缝宽度并提高梁的延性。本研究结合纤维混凝土受拉本构关系,引入一个减弱系数描述纤维混凝土开裂后的刚度,建立了能够反映FRP筋纤维混凝土梁拉伸刚化效应的三维有限元模型。在不同纤维含量和不同配筋率下,模拟获得了与实验结果一致的荷载-位移响应。此外,有限元分析得到的裂缝形态与实验结果良好吻合,且随着减弱系数的减小,裂缝扩展减缓,极限荷载下裂缝数量增多,宽度减小。研究还表明,减弱系数随纤维含量特征参数的增大而线性减小,其线性斜率受配筋率的影响微弱,而截距受配筋率的影响明显。