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纤维塑料筋混凝土结构的系列研究 总被引:1,自引:0,他引:1
彻底解决钢筋锈蚀问题的一个有效办法是采用纤维塑料筋(即FRP筋),1995年我们在国内首先开展了FRP筋混凝土结构的系列研究,取得了阶段性的研究成果:①研制生产国内首批FRP螺纹筋;②对FRP筋在不同环境介质中的粘结锚固性能进行研究;③对FRP筋普通混凝土梁的受力性能和设计理论进行研究;④研制新型FRP筋预应力锚具;⑤对预应力FRP筋混凝土粱的受力性能和设计理论进行研究等.本文重点介绍以上几方面的研究工作,并对今后FRP筋混凝土结构的发展趋势作了展望. 相似文献
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纤维增强复合材料(FRP)是一种新型高强耐腐蚀材料,广泛应用于混凝土结构加固以及斜拉桥和悬索桥的拉索结构。设计一种试验装置,对3种FRP筋(CFRP、BFRP、GFRP)进行预应力状态下剪切试验和纯剪切试验。试验结果表明,FRP筋在预应力状态下有3种剪切破坏模式,部分FRP筋在预应力状态下抗剪强度有所提高。 相似文献
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FRP筋是一种高性能的复合材料,与钢筋相比,FRP筋具有轻质、高的抗拉强度、耐腐蚀性好等特点。近年来,FRP筋代替钢筋或预应力钢筋被应用在混凝土结构中以提高耐久性成为一种趋势。文章对FRP筋增强混凝土梁、柱受力性能的研究现状进行了相关的介绍,并提出有待进一步深入研究的相关问题。 相似文献
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结合FRP筋具有重量轻、强度高、耐腐蚀等特点,拟在试验和理论分析的基础上,对有粘结预应力FRP筋混凝土梁的受力性能和计算方法进行研究,提出了一些设计建议。 相似文献
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FRP索预应力结构应用研究 总被引:2,自引:0,他引:2
FRP(纤维增强塑料 )作为一种新型高性能的结构材料 ,具有高强、轻质和抗腐蚀等特点 ,在桥梁工程中具有发展前景的一种新型预应力索用材。本文介绍了FRP索的材料性能、FRP索预应力构件的短期和长期性能以及锚固技术 ,并提出发展研究方向 相似文献
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FRP在工程结构中的应用与发展 总被引:86,自引:0,他引:86
FRP(纤维增强复合材料)近年来在混凝土结构加固中得到广泛的应用,并作为一种新型高性能结构材料受到结构工程界的广泛关注,国内外有关研究和工程单位开展了大量的研究和实践应用。本文介绍了结构工程中常用的FRP材料性能和形式,分析了其优点与不足,并介绍了FRP加固结构、FRP配筋和预应力FRP筋混凝土结构、FRP结构与FRP组合结构以及FRP在桥梁结构、大跨空间结构和智能结构中的应用与发展,以期促进我国土建结构工程中对这一新型高性能材料应用和研究工作的开展。 相似文献
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预应力FRP片材加固混凝土墩柱的研究进展 总被引:1,自引:0,他引:1
预应力FRP片材加固混凝土墩柱施工工艺简便,既可用于震后应急加固,也适于永久性抗震加固。这种新型加固方法能够避免FRP片材的应变滞后,充分发挥FRP片材的高强特性;促使原有混凝土裂缝的弥合,限制裂缝的发生和开展,提高柱的耐久性能;重新调整混凝土墩柱的受力状态,显著提高被加固混凝土墩柱的延性、承载力和抗震性能。基于预应力FRP片材加固混凝土墩柱的国内外研究现状,围绕预应力FRP片材加固混凝土墩柱的起源、FRP片材预应力施加方法、预应力FRP片材锚夹具、预应力FRP片材加固混凝土柱的抗震性能等几个方面的最新研究进展进行了综述,对目前FRP片材加固混凝土墩柱研究中亟需解决的问题进行了分析与展望。 相似文献
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FRP约束混凝土压弯构件力学性能的理论分析 总被引:7,自引:1,他引:6
利用FRP约束混凝土的应力 -应变关系模型 ,采用数值方法 ,对FRP约束混凝土压弯构件的荷载 -变形关系进行了全过程分析 ,据此考察了FRP极限强度、混凝土强度、含FRP率和长细比等参数对该类构件力学性能及承载力的影响 ,可供有关工程实践参考 相似文献
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Wai Ching Tang 《钢结构》2009,(1)
研究和比较疲劳荷载下,纤维增强复合材料和混凝土各种粘结系统粘结性能。FRP粘结系统包括外部粘结FRP,表面嵌入粘结FRP,纤维锚固FRP以及最近发展起来的混杂粘结FRP系统。在两种力学参数不变的情况下,对5组混杂粘结FRP系统进行了研究。为达到研究的目的,改进了双剪粘结试验(直接拉出试验)。通过疲劳和单调试验,对破坏机制、荷载-位移曲线以及应变进行分析,探讨了荷载大小和循环周期对粘结性能的影响。基于试验结果,根据疲劳粘结性能对不同粘结系统的优缺点进行论述。 相似文献
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《Thin》2014
Recent experimental studies by Sweedan et al. [17] and Alhadid et al. [2] on the behavior of mechanically fastened (MF) steel-FRP lap connections and steel beams strengthened with MF-FRP, respectively, revealed a promising efficiency of the fastening system in retrofitting deteriorated steel beams. The study demonstrated that the dominant failure mode, in the tested connections and beams, was due to excessive bearing in the FRP laminate at the locations of the fasteners as long as sufficient number of fasteners is used. The current study describes a three-dimensional nonlinear finite element (FE) model that accounts for the interfacial slip between the FRP laminates and the steel beam. The FE model is validated against the experimental results reported by Alhadid et al. [2], and excellent agreement is found. The FE model is then used to shed more light on the mechanical behavior of the tested composite steel-FRP beams including force distribution in steel fasteners especially during spread of yielding in the steel section, and the stress distribution in the FRP laminates. The study concludes that as the length of the FRP increases, the degree of composite action in the elastic range increases indicating higher efficiency of the FRP laminate. The FRP laminate contributes significantly in carrying the mid-span loads after yielding of the steel section. 相似文献
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Li JIA Zhi FANG Maurizio GUADAGNINI Kypros PILAKOUTAS Zhengmeng HUANG 《Frontiers of Structural and Civil Engineering》2021,15(6):1426-1440
The ultra-high-performance concrete (UHPC) and fiber-reinforced polymer (FRP) are well-accepted high-performance materials in the field of civil engineering. The combination of these advanced materials could contribute to improvement of structural performance and corrosion resistance. Unfortunately, only limited studies are available for shear behavior of UHPC beams reinforced with FRP bars, and few suggestions exist for prediction methods for shear capacity. This paper presents an experimental investigation on the shear behavior of UHPC beams reinforced with glass FRP (GFRP) and prestressed with external carbon FRP (CFRP) tendons. The failure mode of all specimens with various shear span to depth ratios from 1.7 to 4.5 was diagonal tension failure. The shear span to depth ratio had a significant influence on the shear capacity, and the effective prestressing stress affected the crack propagation. The experimental results were then applied to evaluate the equations given in different codes/recommendations for FRP-reinforced concrete structures or UHPC structures. The comparison results indicate that NF P 18-710 and JSCE CES82 could appropriately estimate shear capacity of the slender specimens with a shear span to depth ratio of 4.5. Further, a new shear design equation was proposed to take into account the effect of the shear span to depth ratio and the steel fiber content on shear capacity. 相似文献
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近10年来,纤维增强聚合物FRP(fiber reinforced polymer/plastic,简称FRP)已广泛应用于建筑工程行业,然而FRP材料的耐火性能极差。对FRP材料火灾(高温)下性能研究的最新成果进行综述与分析,包括FRP材料的热工性能、高温下FRP材料的力学性能、FRP材料与混凝土的粘结性能及FRP材料燃烧性能的研究等,指出了火灾下FRP材料研究尚存在的问题,并展望了今后的研究发展趋势。 相似文献
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纤维增强聚合物(FRP)以其轻质、高强、抗腐蚀、耐疲劳及其温度稳定性而受到土木工程界的日益关注,近年来被广泛地用于各种形式结构的修复和加固。从结构试验、计算理论和计算方法三个方面,阐述了国内外研究者对FRP约束钢筋混凝土柱抗震性能的研究现状,分析了研究中存在的不足,并对FRP约束钢筋混凝土柱的抗震性能今后的研究提出了展望。 相似文献
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In this paper, two kinds of tests were designed to investigate and study the bond behavior between fiber-reinforced-plastic (FRP) and concrete. By newly designed double-shear test setup, the strain development and distribution in FRP plate was acquired. At the same time, the direct shear bond distribution was given and the effective bond length was suggested. Through a bending test on simply supported beam with an extended end, the strain and stress distribution of FRP plate in the negative moment zone were studied. Based on the test results, conclusions including the maximum effective bond length, the mean bond stress and the development length for flexural bond in the negative moment zone were presented. The effective bond length is about 100 mm and the mean bond stress is about 1.287 MPa. The development length for flexural bond in the negative moment zone is about 300 mm. 相似文献