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SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures最新文献

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Strengthening of Concrete Structures using Steel Wire Reinforced Polymer 钢丝增强聚合物对混凝土结构的加固
W. Figeys, L. Schueremans, K. Brosens, D. Gemert
SYNOPSIS: This paper deals with a new material for external reinforcement: Steel Wire Reinforced Polymer (SWRP). It consists of thin high-strength steel fibres embedded in a polymer laminate. This innovative material combines the advantages of steel plates and CFRP, which are already used today. The material cost of SWRP is relatively low, and the laminate is quite flexible. In the feasibility part, the practical use of SWRP is studied. Further, the available design model for externally bonded reinforcement for concrete elements is confronted with the results of an experimental program, carried out at the Reyntjens Laboratory of KULeuven. The model is adapted accordingly.
摘要:本文介绍了一种新型的外部增强材料:钢丝增强聚合物(SWRP)。它由嵌入在聚合物层压板中的薄的高强度钢纤维组成。这种创新材料结合了目前已经使用的钢板和碳纤维增强塑料的优点。SWRP材料成本相对较低,层压板柔韧性强。在可行性部分,研究了SWRP的实际应用。此外,混凝土构件外部粘结钢筋的可用设计模型与在鲁汶大学雷恩特延斯实验室进行的实验程序的结果相比较。该模型进行了相应的调整。
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引用次数: 16
FRP-Strengthening in Shear: Tests and Design Equations frp在剪切中的强化:试验和设计方程
G. Monti, M. Liotta
Synopsis: This paper presents the results of an experimental/analytical study aiming at obtaining a clear understanding of the underlying mechanisms of the shear strengthening of reinforced concrete beams with fibre reinforced polymers (FRP). Through the definition of the generalised constitutive law of a bonded FRP sheet, of the compatibility imposed by the shear crack opening, and of the appropriate boundary conditions depending on the strengthening configuration, analytical expressions of the stress field in the FRP sheet crossing a shear crack are obtained. These expressions allow to easily define closed-form equations for the effective strength of FRP strips/ sheets used for shear strengthening, as function of both the adopted strengthening configuration and some basic geometric and mechanical parameters. The FRP contribution is then added to those of concrete and steel. The equations accuracy has been verified through correlation studies with experimental results obtained from the literature and from laboratory tests on purposely under-designed real-scale beam specimens, strengthened with different FRP schemes.
摘要:本文介绍了一项实验/分析研究的结果,旨在清楚地了解纤维增强聚合物(FRP)对钢筋混凝土梁的剪切增强的潜在机制。通过定义粘结玻璃钢片材的广义本构律、剪切裂纹张开所施加的相容性以及根据加固配置确定的适当边界条件,得到了玻璃钢片材穿过剪切裂纹时应力场的解析表达式。这些表达式可以很容易地定义用于剪切加固的FRP条/板的有效强度的封闭形式方程,作为所采用的加固配置和一些基本几何和力学参数的函数。然后将FRP的贡献添加到混凝土和钢的贡献中。通过与文献中实验结果的相关性研究,以及对故意设计不足的实比例尺梁试件进行的实验室试验,验证了方程的准确性,这些梁试件采用不同的FRP方案进行加固。
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引用次数: 27
A New Punching Shear Equation for Two-Way Concrete Slabs Reinforced with FRP Bars 一种新的双向FRP筋混凝土板冲剪方程
S. El-Gamal, E. El-Salakawy, B. Benmokrane
Synopsis: Recently, there has been a rapid increase in using the non-corrodible fiberreinforced polymers (FRP) reinforcing bars as alternative reinforcements for concrete structures especially those in harsh environments. The elastic stiffness, ultimate strength, and bond characteristics of FRP reinforcing bars are quite different from those of steel, which affect the shear capacity. The recently published FRP design codes and guidelines include equations for shear design of one-way flexural members. However, very little work was done to investigate the punching shear behavior of two-way slabs reinforced with FRP bars. The current design provisions for shear in two-way slabs are based on testing carried out on steel reinforced slabs. This study presents a new model to predict shear capacity of two-way concrete slabs that were developed based on extensive experimental work. The accuracy of this prediction model was evaluated against the existing test data. Compared to the available design models, the proposed shear model seems to have very good agreement with test results with better predictions for both FRP and steel-reinforced concrete two-way slabs.
摘要:近年来,非腐蚀纤维增强聚合物(FRP)钢筋作为混凝土结构的替代加固材料,特别是在恶劣环境下的混凝土结构,得到了迅速的发展。FRP筋的弹性刚度、极限强度和粘结特性与钢筋有较大差异,影响了抗剪能力。最近发布的FRP设计规范和指南包括单向受弯构件的剪切设计方程。然而,研究FRP筋双向板的冲剪性能的工作很少。目前双向板的抗剪设计规定是基于对钢筋板进行的试验。本文提出了一种预测双向混凝土板抗剪承载力的新模型,该模型是在大量试验工作的基础上发展起来的。根据现有试验数据对该预测模型的准确性进行了评价。与现有的设计模型相比,所提出的剪切模型似乎与试验结果非常吻合,对FRP和钢-钢筋混凝土双向板都有更好的预测。
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引用次数: 30
Seismic Rehabilitation of a Full-Scale RC Structure using GFRP Laminates 全尺寸钢筋混凝土结构玻璃钢层合板的抗震修复
Balsamo Alberto, M. Gaetano, M. Elena, Negro Paolo, Prota Andrea
Synopsis: The SPEAR (Seismic PErformance Assessment and Rehabilitation) research Project is specifically targeted at existing under-designed structures and, in its framework, the core of the experimental activity is the series of full-scale pseudodynamic tests on a torsionally unbalanced three-storey RC structure, carried out at the ELSA Laboratory of the Joint Research Centre. As one of the main goals of the project is to pursue a better understanding of the potential of seismic rehabilitation methods, the experimental activity of the SPEAR project has foreseen pseudo-dynamic tests both on the ‘as-built’ and the FRP-retrofitted full-scale structure. In the paper, the strategy of the retrofitting intervention, consisting in the application of glass fiber wrapping, is described and the performance of the specimen in the two different configurations during the PsD tests is described. Through the experimental data, the effectiveness of the retrofitting strategy is thus assessed.
摘要:SPEAR(地震性能评估和恢复)研究项目专门针对现有的设计不足的结构,在其框架内,实验活动的核心是在联合研究中心的ELSA实验室进行的一系列扭转不平衡三层RC结构的全尺寸伪动力测试。由于该项目的主要目标之一是更好地了解地震恢复方法的潜力,SPEAR项目的实验活动预见了“建成”和frp改造的全尺寸结构的伪动力测试。本文描述了玻璃纤维包裹的改造干预策略,并描述了两种不同配置下试件在PsD试验中的性能。通过实验数据,对改造策略的有效性进行了评价。
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引用次数: 8
Gripping Behavior of CFRP PrestressingRods for Novel Anchor Design 新型锚杆设计中CFRP预应力杆的抓握性能研究
A. Al-Mayah, K. Soudki, A. Plumtree
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引用次数: 1
FRP Repair Methods for FRP Repair Methods forUnreinforced Masonry Buildings Subject to Cyclic Loading 循环荷载作用下无加固砌体建筑的FRP修复方法
P. Foster, J. Gergely, W. M. Young, A. Corzo
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引用次数: 4
An Exploratory Study of FRP SeismicRestrainers Subjected to Dynamic Loads 玻璃钢减震器在动荷载作用下的探索性研究
M. Saiidi, Rita Johnson, E. Maragakis
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引用次数: 0
Design Guidelines for the Strengthening of Existing Structures with FRP in Italy 意大利现有结构FRP加固设计指南
L. Ascione, A. Benedetti, R. Frassine, G. Manfredi, G. Monti, A. Nanni, C. Poggi, E. Sacco
This document, described in more details in the paper, sets for the first time in Italy some standards for production, design and application of FRP for reinforced concrete and masonry constructions. It is also conceived with an informative and educational spirit, which is crucial for the dissemination, in the professional sphere, of the mechanical and technological knowledge needed for an aware and competent use of such materials.
该文件在意大利首次为钢筋混凝土和砌体建筑的FRP的生产、设计和应用设定了一些标准,文中对此进行了更详细的描述。它还具有一种信息和教育精神,这对于在专业领域传播有意识和称职地使用这些材料所需的机械和技术知识是至关重要的。
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引用次数: 2
Textile Reinforced Mortars (TRM)versus Fiber ReinforcedPolymers (FRP) as StrengtheningMaterials of Concrete Structures 纺织增强砂浆(TRM)与纤维增强聚合物(FRP)作为混凝土结构的增强材料
T. Triantafillou, C. Papanicolaou
Synopsis: Fiber reinforced polymers (FRP) are investigated in this study in comparison with a new class of materials, textile reinforced mortars (TRM), for shear strengthening and/or seismic retrofitting of concrete structures. Textiles comprise fabric meshes made of long woven, knitted or even unwoven fiber rovings in at least two (typically orthogonal) directions. Mortars – serving as binders – contain polymeric additives in order to have improved strength properties. In this study, experimental investigations were carried out in order to provide a better understanding on the effectiveness of TRM versus FRP jackets as a means of increasing: (i) the axial capacity of concrete through confinement; and (ii) the load-carrying capacity of shear-critical reinforced concrete flexural members. From the results obtained it is strongly believed that the proposed TRM strengthening technique is a viable alternative to the already successful FRP strengthening technique.
摘要:本研究将纤维增强聚合物(FRP)与一种新型材料纺织增强砂浆(TRM)进行对比,用于混凝土结构的剪切加固和/或抗震加固。纺织品包括至少两个(通常是正交的)方向上由长编织、针织或甚至非织造纤维粗纱制成的织物网。砂浆-作为粘合剂-含有聚合物添加剂,以提高强度性能。在本研究中,进行了实验调查,以便更好地了解TRM与FRP护套作为增加手段的有效性:(i)通过约束提高混凝土的轴向容量;(ii)受剪临界钢筋混凝土受弯构件的承载能力。从所获得的结果中,我们强烈认为所提出的TRM加固技术是一种可行的替代已经成功的FRP加固技术。
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引用次数: 55
Seismic Performance of Masonry Infill Walls Retrofitted With CFRP Sheets CFRP布砌筑墙抗震性能研究
M. Saatcioglu, F. Serrato, S. Foo
Synopsis: A significant portion of existing building stock that was constructed prior to the enactment of modern seismic design provisions consists of gravity-load-designed reinforced concrete frames, infilled with unreinforced masonry walls. These structures are susceptible to extensive seismic damage when subjected to strong earthquakes and require retrofitting in order to comply with the provisions of current building codes. Experimental investigation of gravity-load-designed reinforced concrete frames, infilled with concrete block masonry, has been conducted to develop a seismic retrofit strategy that involves the use carbon fiber reinforced polymer (CFRP) sheets. Two half-scale concrete frames, infilled with masonry walls were tested with and without seismic retrofitting. The retrofit technique consisted of CFRP sheets, surface bonded on the masonry wall, while also anchored to the surrounding concrete frame by means of specially developed CFRP anchors. The frame-wall assemblies were tested under constant gravity loads and incrementally increasing lateral deformation reversals. The results indicate that infilled frames without a seismic retrofit develop extensive cracking in the walls and frame elements. The elastic rigidity reduces considerably resulting in softer structure. The failure may occur in non-ductile frame elements, especially in columns. Retrofitting with CFRP sheets controls cracking and increases lateral bracing, improving the elastic capacity of overall structural system. The retrofitted specimen tested in the current investigation showed approximately 300% increase in lateral force resistance, promoting elastic response to earthquake loads as a seismic retrofit strategy. Experimental observations and results are presented in the paper.
简介:在现代抗震设计规定颁布之前建造的现有建筑中,有很大一部分是由重力荷载设计的钢筋混凝土框架组成的,里面填充了未加固的砖石墙。这些结构在遭受强烈地震时容易受到广泛的地震破坏,需要进行改造,以符合现行建筑规范的规定。对混凝土砌块砌体填充的自重荷载设计钢筋混凝土框架进行了试验研究,以开发一种涉及使用碳纤维增强聚合物(CFRP)板的抗震改造策略。两个半比例的混凝土框架,填充砌体墙,进行了抗震改造和不进行抗震改造的测试。改造技术包括CFRP片材,表面粘接在砌体墙上,同时也通过专门开发的CFRP锚锚固定在周围的混凝土框架上。框架-墙体组合在恒定重力荷载和逐渐增加的侧向变形逆转下进行了测试。结果表明,未经抗震加固的填充框架在墙体和框架单元中产生了广泛的裂缝。弹性刚度大大降低,导致结构更柔软。破坏可能发生在非延性框架构件中,尤其是柱。碳纤维布加固控制了裂缝,增加了侧向支撑,提高了整体结构体系的弹性能力。在目前的研究中,改造后的试件测试显示,侧向力阻力增加了约300%,作为抗震改造策略,提高了地震荷载的弹性响应。本文给出了实验观察和结果。
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引用次数: 33
期刊
SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures
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