共查询到20条相似文献，搜索用时 276 毫秒
1.
介绍了碳纤维材料及加固技术，并给出了碳纤维片材加固砼结构设计与计算通过工程实例，简要介绍了碳纤维加固混凝土技术的应用。 相似文献
2.
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。 相似文献
3.
4.
研究了碳纤维(CERP)加固在国内外的应用状况,阐述碳纤维加固板的技术研究、理论研究、工程应用和面临的问题,并展望其发展前景。 相似文献
5.
建筑物由于更换用途荷栽增加,对于托柱转换梁结构体系利用PKPM—SETWE进行力学分析。对于相应梁、板进行粘钢、粘贴碳纤维片材的加固处理,使用过程中通过跟踪检测显示加固效果良好。 相似文献
6.
混凝土结构粘钢加固是一种民用建筑工程的加固技术。目前,钢板贴合加同技术已经是一项成熟的加固技术,在房屋、道路、桥梁及电力、水利工程等混凝土结构维护改造加固材料及施土中已有所应用,其中以民用建筑行业应用的最为广泛。 相似文献
7.
林上顺陈柯丹吴琛徐晓铭 《福建工程学院学报》2021,(3):255-260
超高性能混凝土(Ultra-High Performance Concrete,UHPC)已经在混凝土结构的加固中得到广泛的应用。对在役混凝土梁常见的病害及工程中常用加固方法的优缺点,以及UHPC应用于混凝土梁加固的技术可行性、优缺点、应用前景进行分析,并对既有的UHPC加固梁的施工工艺、受力性能及计算方法等进行综述。研究结果表明:与传统的加固方法相比,采用UHPC对钢筋混凝土梁进行加固,无论在技术可行性、结构耐久性和工程造价方面,均存在明显的优势;与未加固的混凝土梁相比,UHPC 加固梁的承载能力和刚度等力学性能均大幅提高,且对旧桥自重的影响有限;其加固施工工艺是影响增大截面加固效果的重要因素,需结合工程案例开展系统研究;由于加固结构大多已服役数年,在计算加固构件的承载力时,初始损伤对结构承载力的折减是今后需要重点研究的问题。 相似文献
8.
在役钢筋混凝土桥梁加固改造分析 总被引：1，自引：0，他引：1
旧桥梁改造加固是比新建桥梁设计复杂得多的系统工程,本文对在役钢筋混凝土桥梁加固改造的方法,采用增大梁截面积加固法和纤维片材加固法,结合工程实例讨论旧桥梁加固中的应用。 相似文献
9.
赵沙沙 《杨凌职业技术学院学报》2006,5(3):41-42
在混凝土维修加固工程中,采用外粘碳纤维布的新型加固方法,与传统的加固方法相比具有技术先进、性能良好、不影响结构外观、施工周期短、工艺简单等优点。通过在韦水倒虹管桥大梁修复加固工程中的应用,提出在水利工程维修加固中推广应用的前景。 相似文献
10.
随着交通运输量的日益增长,行车密度及车辆载重的日益增加,现有桥梁一部分满足不了承载能力和使用性能上的要求.因此,对桥梁结构的维修、加固和补强等领域的研究和工程应用已引起了世界性的关注.又随着新材料碳纤维加劲塑料(CFRP)的大量生产和价格的逐渐降低,用CFRP代替钢板作为外贴加固材料逐渐成为一种趋势.本文从碳纤维的特性分析出发,论述了碳纤维加固技术在桥梁结构建设中的应用. 相似文献
11.
为研究碳纤维布(CFRP)对加固后钢筋混凝土梁的抗弯疲劳性能的影响,进行了3根CFRP加固梁及1根对比梁的抗弯疲劳试验.研究了碳纤维布加固方式、构件使用荷载等参数对碳纤维布加固损伤钢筋混凝土吊车梁的抗弯疲劳性能影响.试验研究表明:采用碳纤维布加固后,构件裂缝的宽度减小50.2%~66%,发展速度也得到控制,钢筋应力减小24.1%~28.2%,构件的刚度提高14.9%~16.1%.依据试验结果,从现有规范中关于构件刚度计算方法出发,进行了CFRP加固钢筋混凝土吊车梁的疲劳刚度计算分析,该计算方法可用于吊车梁加固工程设计.最后给出了CFRP加固梁的疲劳设计的合理化建议. 相似文献
12.
杨瑞新 《河北工业大学成人教育学院学报》2006,21(4):25-29
碳纤维布加固混凝土结构是一种新型加固方法。本文在试验研究的基础上,将抗拉强度很高的碳纤维布用环氧树脂预浸成为复合增强材料;用环氧树脂粘结剂沿受拉方向粘贴在要补强的柱子上,形成一个新的复合体,使补强碳纤维布与原有钢筋混凝土共同受力,增大结构的抗剪、抗弯强度和提高柱的延性。 相似文献
13.
为研究无机胶粘贴碳纤维布对钢筋混凝土梁高温性能的影响,对3根不同加固方式及防火方式的钢筋混凝土梁进行高温试验。试验结果表明,无机胶及防火涂料对钢筋混凝土梁温度场及跨中挠度有重要作用;与防火性能较差的有机胶相比,无机胶具有较好的耐高温性能,可应用于碳纤维布加固混凝土工程中;防火涂料在火灾过程中具有较好的防火和隔热作用,在防火设计中不可忽略。 相似文献
14.
15.
杨再富 《重庆大学学报(英文版)》2005,4(1):19-22
1 Introduction Reinforcing steel corrosion, freezing-thawing damageand environment pollution are often encountered inmelting snow and deicing for concrete structures suchas highways, airfield runways, bridge decks, etc. inwinter [1]. In North America chemical methods areusually used for deicing and anti-icing. Howeverchemical treatment has caused damage to concrete andcorrosion of reinforcing steel, and resulted in heavyeconomic losses. Therefore, research on new functionaconcrete materials a… 相似文献
16.
Feras ALZOUB ZHANG Qi LI Zheng-liang 《重庆大学学报(英文版)》2007,6(4):305-310
This paper presents the results of an experimental investigation on the response of pre-damaged reinforced concrete (RC) beam strengthened in shear using applied-epoxy unidirectional carbon fiber reinforced polymer (CFRP) sheet. The reasearch included four test rectangular simply supported RC beams in shear capacity. One is the control beam, two RC beams are damaged to a predetermined degree from ultimate shear capacity of the control beam, and the last beam is left without pre-damaged and then strengthened with using externally bonded carbon fiber reinforced polymer to upgrade their shear capacity. We focused on the damage degree to beams during strengthening, therefore, only the beams with side- bonded CFRPs strips and horizontal anchored strips were used. The results show the feasibility of using CFRPs to restore or increase the load-carrying capacity in the shear of damaged RC beams. The failure mode of all the CFRP-strengthened beams is debonding of CFRP vertical strips. Two prediction available models in ACI-440 and fib European code were compared with the experimental results. 相似文献
17.
通过改变碳纤维在混凝土中的掺量,探讨碳纤维对混凝土基本力学性能的影响。实验结果表明：碳纤维对混凝土抗压强度基本没有影响,但对混凝土劈拉强度的影响较显著。当碳纤维掺量为0.08%时,劈拉强度可较素混凝土提高43.3%。同时碳纤维还可明显改善混凝土试件的破坏形态,使试件裂而不碎。 相似文献
18.
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. 相似文献
19.
Extensive research has shown that externally bonded carbon fiber reinforced polymer (CFRP) laminates are particularly suitable for improving the fatigue behavior of reinforced concrete (RC) beams. This paper presents the research on flexural rigidity evolvement laws by testing 14 simple-supported RC beams strengthened with carbon fiber laminates (CFL) under cyclic load, and 2 under monotone load as a reference. The cyclic load tests revealed the peak load applied onto the surface of a supported RC beam strengthened with CFL is linear to the logarithm of its fatigue life, and the flexural rigidity evolvement undergoes three distinct phases: a rapid decrease from the start to about 5% of the fatigue life; an even development from 5% to about 99% of the fatigue life; and a succedent rapid decrease to failure. When the ratio of fatigue cycles to the fatigue life is within 0.05 to 0.99, the flexural rigidity varies linearly with the ratio. The peak load does not affect the flexural rigidity evolvement if it is not high enough to make the main reinforcements yield. The dependences of the flexural rigidity of specimens formed in the same group upon their fatigue cycles normalized by fatigue life are almost coincident. This implies the flexural rigidity may be a material parameter independent of the stress level. These relationships of flexural rigidity to fatigue cycles, and fatigue life may be able to provide some hints for fatigue design and fatigue life evaluation of RC member strengthened with CFL; nevertheless the findings still need verifying by more experiments. 相似文献
20.
OpenSees is a well-recognized open source platform with high compatibility, and it has a well-developed fiber ele- ment method to cope with nonlinear structural analysis. Fiber reinforced polymer （FRP） confined concrete can effectively improve the seismic performance of concrete structures. However, sophisticated constitutive models for FRP confined concrete are not available in the current version of OpenSees. In this paper, after reviewing several typical FRP confined concrete constitutive models, a modified constitutive model for FRP confined concrete in circular sections was proposed based on Lain and Teng （2003）＇s model with four main modifications including the determination of FRP rupture strain, ultimate condition, envelope shape, and hysteretic rules. To embed the proposed constitutive model into OpenSees is a practical solution for engineering simulation. Hence, the secondary development of OpenSees New UserMat was briefly demonstrated and a set of critical steps were depicted in a flow chart. Finally, with the numerical implementations of a series of FRP confined concrete members covering a wide range of load cases, FRP confinement types and geometric properties, the utility and accuracy of the proposed model compared with Lam and Teng （2003）＇s model and new material secondary development in OpenSees were well validated. 相似文献