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主要针对钢桥有效的寿命周期成本(LCC)的优化设计中实际产生的LCC进行了简要的描述和规定。一般钢桥优化设计的LCC模型中,包括钢结构桥梁的初始成本和直接/间接的修复成本,维修/更换成本,材料损坏或者疲劳损失,道路使用者的成本,间接的经济损失。因此,论文着重介绍一般配方的模型和适合实际操作的钢桥有效的LCC系统模型设计。 相似文献
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在简要介绍桥梁全寿命设计理论的基础上,以新疆喀什特区某大桥为设计实例,初步探讨和呈现了该理论在增加桥梁使用寿命和减少全寿命成本等方面的积极作用,为今后的预应力混凝土梁桥设计提供了参考。 相似文献
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Dan M. Frangopol You Dong Samantha Sabatino 《Structure and Infrastructure Engineering》2017,13(10):1239-1257
The development of a generalised framework for assessing bridge life-cycle performance and cost, with emphasis on analysis, prediction, optimisation and decision-making under uncertainty, is briefly addressed. The central issue underlying the importance of the life-cycle approach to bridge engineering is the need for a rational basis for making informed decisions regarding design, construction, inspection, monitoring, maintenance, repair, rehabilitation, replacement and management of bridges under uncertainty which is carried out by using multi-objective optimisation procedures that balance conflicting criteria such as performance and cost. A number of significant developments are summarised, including time-variant reliability, risk, resilience, and sustainability of bridges, bridge transportation networks and interdependent infrastructure systems. Furthermore, the effects of climate change on the probabilistic life-cycle performance assessment of highway bridges are addressed. Moreover, integration of SHM and updating in bridge management and probabilistic life-cycle optimisation considering multi-attribute utility and risk attitudes are presented. 相似文献
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Min-Yuan Cheng Yung-Fang Chiu Chien-Kuo Chiu Yu-Wei Wu Zih-Long Hsu 《Structure and Infrastructure Engineering》2019,15(3):334-350
The current bridge inspection and maintenance protocol that is used in most countries focuses primarily on the visible aspects of bridge fitness and underestimates the invisible aspects, such as resistance to scouring and earthquake hazards. To help transportation authorities to better consider both aspects, the present study developed a new computational intelligence system, the so-called risk-based evaluation model for bridge life-cycle maintenance strategy (REMBMS). This model considers the three main risk factors of component deterioration, scouring and earthquakes in order to minimise the expected life-cycle cost of bridge maintenance. Monte Carlo simulation is used to estimate the probability of bridge maintenance. The evolutionary support vector machine inference model (ESIM) was applied to estimate the risk-related maintenance cost using historical data from the Taiwan Bridge Management System (TBMS) database. The time-influenced expected costs were obtained by multiplying each maintenance probability with its associated cost. Finally, the symbiotic organisms search (SOS) algorithm is used to identify the bridge maintenance schedule that optimises the life-cycle maintenance cost. The present study provides to bridge management authorities an effective approach for determining the optimal timing and budget for maintaining transportation bridges. 相似文献
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关于桥梁几个概念的探讨 总被引:1,自引:1,他引:0
本文用简洁的语言表达了桥梁的一些最基本的概念 ,如 :桥梁的定义、桥梁的型式、影响桥梁发展的三大要素、桥梁的力学概念以及梁桥、拱桥、索桥的共性和特性等 ,通过对这些基本概念的探讨 ,融会贯通 ,可对桥梁有更深入的理解 ,有助于桥梁的概念设计 相似文献
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厦蓉高速赣县禾坪高架桥地形复杂,T梁预制时间长,采用横向架梁技术进行安装。本文介绍了横向架梁施工工艺。通过验算横向轨道梁力学特性,计算纵向架梁桁架受力,确定施工所需主要设备数量。将横向架梁施工工艺与传统纵向架梁施工工艺进行经济技术比较证明,横向架梁施工工艺可降低施工费用,缩短施工工期,可为山区桥梁施工带来较好的经济效益和社会效益。 相似文献
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工便梁加固线路顶进大跨度桥涵技术 总被引:2,自引:1,他引:1
以胶济客运专线工程南罗路顶进框架桥为例,着重从施工准备、施工方案制定和施工方法等方面介绍了工便梁加固线路顶进大跨度桥涵施工技术,总结了采用工便梁加固线路的优点,以期进一步推广该技术的应用。 相似文献
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从预制安装简支梁、现浇混凝土连续梁、悬浇混凝土连续梁三方面对公路桥梁上部结构造价计算要点进行了介绍,指出预算员应熟悉各种桥梁的施工工序和施工时所用的设备,从而提高工程概算的准确性和编制质量。 相似文献
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以神朔复线两座大桥工程为例,介绍了施工图设计概况,阐述了加垫梁墩帽的构造及配筋,提出了采用桥墩墩帽加垫梁调整孔跨的优缺点及其适用条件。 相似文献
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为推动协作体系桥梁的发展,本研究利用桥型象限图对多座现有协作体系实桥进行了构建验证,并通过桥型象限图构建出多种新的不同结构类型的协作体系桥梁。研究表明协作体系桥梁是以五类基本桥型为基础的复杂桥梁,基于桥型象限图能排列、组合出各种不同结构类型的协作体系桥梁。根据协作体系桥梁的特点,提出一类针对大跨度梁式桥跨中下挠病害的加固专用协作体系桥型方案。桥型象限图可为今后协作体系桥梁的设计与研究,提供一种简单快捷方法。 相似文献
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随着城市人口的不断增多,城市道路也越来越拥堵,立交桥、高架桥等逐渐发展起来,但桥梁也逐渐暴露出很多问题。本文阐述了桥梁建筑的重要性以及桥梁梁板预制施工中常见的问题,对桥梁梁板预制施工中的常见问题提出了解决方案。 相似文献
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Fatigue Life of Concrete Bridges under Consideration of Increasing Traffic Loads Increasing traffic loads lead to higher fatigue stresses on bridge structures. The effects on the stresses of the main load‐bearing structure depend on the load models representing weight and the ratio of the load model length to the bearing distance of the superstructure. Within a research project carried out on behalf of the Federal Ministry of Transport, Building and Urban Affairs several different bridge constructions (box girder bridge, skew slab construction, girder bridge with T‐beam elements) were analysed with respect to their fatigue strength. Hence, the stresses in concrete and steel components are examined on extensive numerical models in longitudinal and transversal direction. The fatigue investigations of these existing bridges are performed by specified load combinations according to the German Standard for the design of concrete bridges. Furthermore the future development of heavy traffic loads is included by calculating the effects of a 60to‐heavy traffic vehicle. 相似文献
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随着公路运输的快速发展,大量早期建成投入运营的公路桥梁,服务水平已明显降低,已成为公路运输线上的“瓶颈”。不利于沿线经济的长期可持续发展。对原有公路拓宽改建,提高原有公路桥梁的使用功能,节约工程投资,是旧路改建工程通常采用的有效途径。虽然我国在桥梁加固改造上积累了相当的经验,但是还没有一个系统的桥梁拓宽改建规范,也没有在桥梁拓宽改建方面对于设计资质做出明确的规定,已有的旧桥改造设计大都是根据以往的设计经验所进行的,缺乏规范标准以指导生产实践。因此,旧桥的拓宽改建方法的探索总结具有重要的实际工程意义。 相似文献
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分析了路桥企业成本管理的重要性,探讨了影响路桥企业成本的因素,包括市场因素、项目因素、企业因素和管理因素,以积累路桥企业成本管理经验,实现项目控制目标,从而提升企业综合实力,保证企业健康持续发展。 相似文献
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梁拱组合桥因其造型优美,备受景观工程师的青睐。较传统的板拱桥,具有较大的跨越能力,常被应用于大水域上的景观桥梁设计中。通过实际案例,介绍梁拱组合景观人行桥的设计思路和分析要点,为施工服务。 相似文献