空中自行车快速道钢桥面薄层铺装病害调查与分析

通过空中自行车快速道钢桥面薄层铺装病害调查,分析铺装层病害产生原因与处理方式,利用现场拉拔试验检验薄层铺装结构的层间粘结薄弱环节。现场病害调查结果表明,钢桥面铺装层整体使用性能良好,表面开裂和脱层起壳严重病害少,表面积水和污渍污染是主要问题。经现场拉拔强度检测发现,铺装结构中耐磨层与表面彩色薄层界面粘结是最为薄弱环节,容易引起脱层和起皮问题。     

钢桥面铺装层间界面力学特性研究

以钢桥面环氧沥青混凝土铺装为研究对象,采用剪切试验测定了混凝土与钢板间剪切—滑移曲线,建立了层间界面的粘结滑移本构关系,为探求钢桥面铺装结构受力规律及铺装材料设计提供了参考。     

环氧聚合物混凝土力学性能分析

开发出一种环氧聚合物混凝土以用于钢桥面铺装层早期病害修复。按AC-10和AC-5两个级配设计环氧聚合物混凝土并开展力学性能评价,分析了其抗压强度和抗折强度形成规律。试验结果表明4h抗压强度可以达到4 MPa,达到开放交通的要求。三点弯曲试验证实环氧聚合物混凝土在常温下抗弯拉强度大于20 MPa,低温-18℃最大弯拉应变大于2 000μm/m,表现出良好的柔韧性,适用于钢桥面大变形要求。     

环氧沥青混凝土在大跨径钢桥面铺装中的应用

桥梁建设在经济建设的发展中发挥着重大的作用,作为桥梁行车系的重要组成部分,桥面铺装的好坏直接影响到行车的安全性、舒适性、桥梁耐久性及投资效益和社会效益。将环氧沥青混凝土运用于大跨径钢桥桥面铺装能够取得很好的效果。本文针对环氧沥青混凝土在大跨径钢桥面铺装中的应用进行了探讨,首先对环氧沥青混凝土进行概述,接着分析了大跨径钢桥面铺装中的粘结层试验和环氧沥青混凝土铜桥面铺装中的性能研究,最后结合工程实例指出了环氧沥青混凝土钢桥面铺装中的施工要点。     

环氧沥青防水粘结层在杭州湾跨海大桥钢桥面铺装的应用

本文结合杭州湾跨海大桥南、北航道桥钢桥面铺装工程实例,阐述了钢桥面铺装环氧沥青混凝土工程结构中环氧沥青防水粘结层设置的必要性,分析了环氧沥青防水粘结层的材料特点及技术要求,论述了环氧沥青防水粘结层的施工工艺、控制要点以及在实际工程中的应用情况。     

钢桥面环氧沥青铺装维修时防水层的选择探讨

以宁波市大榭二桥铺装小修工程为例探索了钢桥面环氧沥青混凝土铺装小修时防水层与铺装层的选材方案和施工工艺,实践表明,采用防水粘结层为二阶反应型环氧树脂粘结剂的浇注式沥青混凝土方案能够满足钢桥面环氧沥青铺装小规模维修的施工要求。     

桥面铺装用环氧防水粘结层使用性能研究

对不同环氧树脂(撒碎石)层数、不同碎石粒径的环氧下封层进行剪切试验和拉拔试验,研究环氧下封层与桥面及沥青混凝土铺装层间的抗剪、粘结工作机理,研究结果表明:双层环氧树脂较单层环氧树脂具有更大的抗剪强度和粘结强度,环氧下封层可以抵抗沥青混凝土高温施工过程中的短期破坏。     

桥面防水粘结料性能研究

桥面防水粘结料的性能影响着桥面铺装层的使用性能。选取SBS沥青、环氧沥青、SBS改性乳化沥青以及聚合物改性沥青防水涂料制成试件,分别进行拉伸、剪切、拉拔以及室内模拟试验,评价了他们的防水粘结性能,指出环氧沥青性能优异,更适于在钢桥面及混凝土桥面铺装中应用。     

国产环氧沥青复合材料的性能与工程应用

本文结合南京二桥的科研攻关及后续的系统研究,及NJ多组分新型环氧沥青在国内许多大型基础工程中得到应用,介绍了此产品在钢桥面铺装、水泥混凝土桥面铺装、钢桥面防水粘结层、水泥混凝土桥面防水粘结层。长大纵坡与隧道等特殊路段铺装等方面取得了非常好的使用效果,论证了此产品打破了美国环氧沥青技术的垄断局面。其耐疲劳性能、低温性能和最终稳定度等关键指标超过美国进口的环氧沥青材料,同时铺装性能更加优越。     

胶粉改性沥青桥面防水层层间粘结强度室内试验分析

桥面防水层的层间粘结强度直接影响桥面铺装层的耐久性。文章通过室内拉拔试验来测试当水泥混凝土桥面与沥青混凝土面层之间使用胶粉改性沥青作为防水粘结层时的粘结强度,用以评价层间结合状况,研究不同因素对胶粉改性沥青防水粘结层层间粘结力的影响规律。     

钢桁架人行天桥设计

介绍了某路三跨钢桁架人行天桥的设计.该桥主体结构由两榀钢桁架和钢管柱组成,桥面系采用钢桥面板和混凝土铺装组成,桥面上铺室外用防滑塑胶地板.设计时对竖向第一频率进行验算,避免人行走时桥身产生共振.设计思路及选型可供技术人员作同类设计时参考.     

Experimental study and numerical analysis on mechanical behavior of T-shape stiffened orthotropic steel-concrete composite bridge decks

A new-type of orthotropic steel-concrete composite bridge deck system was developed, by casting the concrete overlay on the top of the orthotropic steel deck ribbed with T-shape steel members. To study its mechanical behavior (in terms of failure mode, load-deflection relationship, concrete crack initiation and propagation, strength, stiffness and so on), two new-type orthotropic steel-concrete composite bridge decks with different section dimensions were experimentally investigated and two reference decks (reinforced concrete deck and orthotropic steel deck) were also involved in the research for comparison. For the two new-type orthotropic steel-concrete composite decks, the average value of ultimate loads per width is 885.7kN, which is 2.35 and 1.61 times of that of the concrete and steel reference decks with almost the same section height. Experimental results proved that the composite deck can effectively control the crack initiation and propagation in the concrete and postpone the yielding of the steel bars and steel plates, due to the composite action between the concrete overlay and the underlying steel plate. Furthermore, the Finite Element (FE) model of the orthotropic steel-concrete composite deck was developed and validated by test results. A parametric study is conducted regarding to the stiffness of shear studs. With the validated FE model, stress distribution in the underlying steel plate and T-shape stiffeners and development of concrete cracking in the concrete overlay were characterized at different load levels.     

Performance of steel bridge deck pavement structure with ultra high performance concrete based on resin bonding

This research investigated a pavement system on steel bridge decks that use epoxy resin (EP) bonded ultra-high performance concrete (UHPC). Through FEM analysis and static and dynamic bending fatigue tests of the composite structure, the influences of the interface of the pavement layer, reinforcement, and different paving materials on the structural performance were compared and analyzed. The results show that the resin bonded UHPC pavement structure can reduce the weld strain in the steel plate by about 32% and the relative deflection between ribs by about 52% under standard axial load conditions compared to traditional pavements. The EP bonding layer can nearly double the drawing strength of the pavement interface from 1.3 MPa, and improve the bending resistance of the UHPC structure on steel bridge decks by about 50%; the bending resistance of reinforced UHPC structures is twice that of unreinforced UHPC structure, and the dynamic deflection of the UHPC pavement structure increases exponentially with increasing fatigue load. The fatigue life is about 1.2 × 10⁷ cycles under a fixed force of 9 kN and a dynamic deflection of 0.35 mm, which meets the requirements for fatigue performance of pavements on steel bridge decks under traffic conditions of large flow and heavy load.     

BRS树脂沥青组合体系钢桥面防水层施工技术

摘要：ERS（EBCL防水粘结层＋RA05树脂沥青混凝土＋SMA-13沥青混凝土）树脂沥青组合体系正广泛应用于钢桥面铺装、EBCL层作为防水粘结层,具有变形追随能力强、热稳定性高、与钢板粘结强度好等优点,该结构层同时兼具钢桥面板防腐的功能,可有效保证钢桥面板的耐久性和使用安全性。本文介绍了ERS树脂沥青组合体系在嘉绍大桥钢桥面铺装中的应用。     

Fatigue behavior and statistical evaluation of the stress category for a steel-concrete composite bridge deck

The maintenance cost of bridges is rapidly increasing since many existing bridges are deteriorating or reaching their design life all over the world. Moreover, as many long-span bridges are under construction and planning in Korea, research and development on bridge decks with high load-resistance capacity as well as high fatigue strength has become a growing concern. This research gives experimental results of the fatigue behavior of a new-type of steel-concrete composite bridge deck being developed under such circumstances. The proposed composite bridge deck consists of corrugated steel plate, welded steel ribs, stud shear connectors, and reinforced concrete filler. Fatigue tests were conducted under a four-point bending test with four different stress ranges in constant amplitude. In order to determine the influence of the concrete filling, fatigue tests on partial steel specimens containing only plain corrugated steel plates were performed in advance. The partial steel specimens and the steel-concrete composite deck specimens both showed fatigue failure in the tension part concerning the fillet welding part between the corrugated steel plate and steel rib. Finally, the stress category of the fillet welding part of each specimen is evaluated based on a statistical approach of Albrecht’s probability model. The research concludes that the fatigue behavior of such steel-concrete composite decks under sagging moment can be estimated based on the classical S-N approach, focusing on steel components.     

Experimental investigation on behaviour of steel-concrete composite bridge decks with perfobond ribs

This paper introduces a test program conducted for steel-concrete composite bridge decks with perfobond rib shear connectors. The composite deck consists of profiled steel sheeting, perfobond ribs, steel reinforcements, and concrete. To provide longitudinal shear resistance between the profiled sheeting and the concrete, perfobond ribs were used. For a prototype steel-box girder bridge, two types of deck profiles with deck-to-girder connections were designed. To validate the effectiveness of the proposed deck system for bridge application, push-out, full-scale flexural, and deck-to-girder connection tests for each deck profile have been conducted. The results of tests have shown that the perfobond ribs can be effectively used for shear connection in the steel-concrete composite decks.     

Parametric Study on the Interface Layer of Renovation Solutions for Orthotropic Steel Bridge Decks

Abstract: The article presents renovation solutions for orthotropic steel bridge decks consisting of bonding a second steel plate to the existing steel deck in order to reduce the stresses and enlarge the life span of the orthotropic bridge deck. Two solutions for the interface layer between the existing deck plate and the second steel plate are presented: thin epoxy (bonded system) and thick polyurethane (sandwich system). A parametric study based on analytical solutions is carried out on flexural behavior of beams representing the renovation solutions. The influence of geometrical, mechanical and structural parameters on the stiffness and stress reduction factor of the system is studied. Maximum values of stiffness and stress reduction are achieved when maximizing the interface layer thickness and minimizing the second steel plate thickness with in certain practical limits. Based on the weight restrictions one can choose the most efficient interface layer regarding thickness and mechanical properties.     

桥面防水材料粘结性能研究

粘结是桥面防水材料的重要性能之一,直接关系到桥面铺装的层间稳定性。通过拉拔试验,对防水材料粘结性能进行研究,试验结果表明,不同材料的粘结强度差异明显,层间薄弱面位于防水层与桥面混凝土间;随着温度的升高,材料的粘结强度显著降低;粘结强度随时间变化的规律,呈指数函数关系;混凝土表面状况不同,粘结强度也不同,粘结强度与摩擦系数的关系表现为非线性多项式函数关系;防水材料在破坏后的愈合能力,对于卷材防水层,只有其原始状态下的一半多;而涂膜类防水层则在拉裂后几乎失去粘结力。     

Multi-objective and probabilistic decision-making approaches to sustainable design and management of highway bridge decks

The aging and deterioration of highway bridges and the new requirements for sustainable infrastructures and communities require innovative approaches for their management that can achieve an adequate balance between social, economic and environmental sustainability. This paper presents a multi-objective decision-making approach for the sustainable design and management of highway bridge decks, which can consider several and conflicting objectives, such as the minimisation of owner's costs, users costs, and environmental impacts and uses goal setting and compromise programming to determine the satisficing and compromise solutions that yield the best trade-off between all competing objectives. The proposed approach is based on robust reliability-based mechanistic models of the deterioration and service life of reinforced concrete bridge decks, which include diffusion models for the prediction of chloride ingress into concrete and steel corrosion and thick-walled cylinder models for the prediction of stresses induced by the accumulating corrosion products in the concrete cover. The proposed approach is illustrated on the life cycle design and management of highway bridge decks using normal and high performance concrete. It is shown that the high performance concrete deck alternative is a Pareto optimum, while the normal concrete deck is found to be a dominated solution in terms of life cycle costs and environmental impacts.     

正交异性钢桥面板改造的组合粘结系统

<正>交异性钢桥面板改造的问题在于既有钢板与第二个钢板的粘结,以降低应力和增加正交异性钢板的使用寿命。通过试验和分析,对梁的弯曲性能进行参数研究。试验考虑不同厚度、温度和跨度的影响。从试验结果可见,应力降低与温度无关。最小化第二块钢板的厚度及最大化粘结层厚度,可降低重量,增加组合结构的刚度,这是最有效的解决方法。组合梁的弹性性能和屈服荷载取决于钢板的性能,温度的影响不显著。然而,粘结层的受剪最终导致梁的破坏,而粘结层的性能受温度的影响较大。