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IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation最新文献

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Compassion: Essence of Beauty from Triunity of Bridge-CAD 同情:从桥- cad的三位一体看美的本质
In the research process of bridge-CAD, through the analysis of the results from penman’s new concept for bridge triunity, it is concluded that the essence of beauty is compassion originally being “karun!a” in Sanskrit, and this conclusion is primarily verified. This study is of positive significance to the cultural self-confidence of Chinese nation.
在桥梁cad的研究过程中,通过对penman桥梁三合一新概念成果的分析,得出美的本质是“慈悲”本是“卡伦!”在梵语中是“a”,这个结论初步得到了证实。本研究对提高中华民族的文化自信具有积极意义。
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引用次数: 0
Construction of Flexible Waterstops on Underwater Cofferdams for Pile Caps in Bridge Projects 桥梁承台水下围堰柔性止水带的施工
The water-stopping efficiency of cofferdams for pile caps is an important indicator with direct influ- ence to the quality and durability of the pile-pouring process. In recent years, a new technique fea- turing flexible capsules serving as waterstops has been introduced, but is still in experimental stage. This thesis, taking the water-stopping construction programme of underwater PC houses of the J. P. Magufuli Bridge project in Tanzania as background, analyzed the two existed types of flexible water- stopping construction methods, id est the integral and separate structures, and studied on measures for improving the flexible water-stopping construction techniques and optimizing the rubber cap- sule waterstops, in the hope of providing references and, possibly, inspirations for similar projects in the future.
承台围堰的止水效率是一项重要指标,直接影响到浇筑过程的质量和耐久性。近年来,人们提出了一种柔性胶囊作为止水带的新技术,但仍处于试验阶段。本文以坦桑尼亚J. P. Magufuli大桥水下PC屋止水施工方案为背景,分析了现有的两种柔性止水施工方法,对整体结构和分体式结构进行了测试,研究了改进柔性止水施工技术和优化橡胶帽壳止水的措施,以期为今后的工程建设提供参考。对未来类似项目的启发。
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引用次数: 0
Wind Induced Vibration Performance of Suspended Double-deck Flat Box Girder Bridge 悬索式双层平箱梁桥的风振性能
The paper researches the wind vibration performance of suspended double-deck streamlined bridge deck using the wind tunnel test and numerical simulation. Studies shown that for suspended double- deck bridge, due to the aerodynamic interference of the upper deck, the lower deck is driven by a vertical vibration negative damping, and the vertical vibration is significantly changed. The pressure distribution of the upper deck and the upper edge of lower deck did not change. The wind load acts on the upper edge of lower deck, and the minus attack angle was generated. With the generation, migration and shedding of large-scale vortices at the lower edge of the lower deck, the lower deck occurs the bending-torsional coupling "soft flutter". Moreover, due to the structural static coupling between the upper deck and the lower deck, the bending-torsional soft flutter at the lower deck induces the bending-torsional soft flutter of the double-deck bridge deck.
采用风洞试验和数值模拟相结合的方法对悬索式双层流线型桥面的风振性能进行了研究。研究表明,对于悬索式双层桥,由于上部桥面的气动干扰,下层桥面受到竖向振动负阻尼的驱动,竖向振动发生明显变化。上层甲板和下层甲板上缘的压力分布没有变化。风荷载作用在下甲板上缘,产生负攻角。随着下甲板下边缘大尺度涡的产生、迁移和脱落,下甲板发生弯扭耦合“软颤振”。此外,由于上下甲板之间的结构静力耦合,下甲板的弯扭软颤振引起双层桥甲板的弯扭软颤振。
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引用次数: 0
Advancements in Timber Construction: A Review of Prefabricated Mass Timber Floor Assemblies 木结构的发展:预制木地板的综述
This paper provides a state-of-the-art review of prefabricated mass timber floors, with a focus on composite floor assemblies for common residential and long-span office applications. The discussion relates to different design aspects, including connection systems and methods of assembly. Also, design methods and code provisions for the floor assemblies comprising ultimate limit state design, vibration control and long-term behaviour are expounded. A life-cycle overview of floor solutions is also presented to highlight their sustainability potential. The paper demonstrates how the building industry can leverage the structural performance, light weight and prefabrication capabilities of these innovative floor solutions for a better-built environment.
本文提供了预制木地板的最新技术综述,重点是用于普通住宅和大跨度办公室应用的复合地板组件。讨论涉及不同的设计方面,包括连接系统和装配方法。阐述了楼板构件的设计方法和规范规定,包括极限状态设计、振动控制和长期性能。还介绍了地板解决方案的生命周期概述,以突出其可持续性潜力。本文展示了建筑行业如何利用这些创新地板解决方案的结构性能、轻质和预制能力,以创造更好的建筑环境。
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引用次数: 0
Design of the Main Structure of The Pi River Water Viaduct 皮河高架桥主体结构设计
The Pi River Water Viaduct is a milestone in the Yangtze-to-Huai Water Diversion Project. From the structure point of view, it is a girder-arch composite system with a span configuration (68+110+68)m. It is the first aqueduct made of steel structures in China. And its span ranks the 1st in the world in terms of navigable aqueducts. Site selection, load features, structure type, durability are firstly discussed in the paper on the basis of construction conditions, and then a corresponding conceptual design is given. The reliability of the design solution is validated by a large number of scientific studies and tests, and guidance for detailed structural design is also summarized from the studies and tests.
皮河高架桥是长江引水工程的一个里程碑。从结构上看,它是一个跨度为(68+110+68)m的梁拱组合体系。这是中国第一座钢结构渡槽。其通航渡槽跨度居世界首位。本文首先从施工条件出发,对其选址、荷载特征、结构类型、耐久性进行了探讨,并给出了相应的概念设计。通过大量的科学研究和试验,验证了设计方案的可靠性,并从研究和试验中总结出详细结构设计的指导思想。
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引用次数: 0
Nonlinear Coupling in Cable-Supported Bridges for Non-Analogous Modes 非相似模态下索桥的非线性耦合
It has been shown that the nonlinear differential equations representing the structural system of a suspension bridge exhibit nonlinear modal coupling that can lead to large torsional vibrations of the bridge deck. Such nonlinear coupling could play a role in the stability of cable-supported bridges under wind effects. Therefore, this paper presents an investigation of nonlinear modal coupling in cable-supported bridges with an emphasis on coupling between pairs of non- analogous modes, i.e., modes having a weak correlation along the bridge deck between the verti- cal displacement and torsional rotation. A procedure for assessing nonlinear coupling that relies on nonlinear generalized stiffness parameters is utilized for this purpose. Results of nonlinear gen- eralized stiffness analysis for suspension bridges indicate that non-analogous modes have a weak- er nonlinear coupling compared to analogous modal pairs.
研究表明,表示悬索桥结构系统的非线性微分方程具有非线性模态耦合,可导致桥面产生较大的扭转振动。这种非线性耦合可以对风作用下索桥的稳定性起到一定的作用。因此,本文对索桥的非线性模态耦合进行了研究,重点研究了非相似模态对之间的耦合,即沿桥面垂直位移和扭转转动之间具有弱相关性的模态。为了达到这个目的,我们采用了一种基于非线性广义刚度参数的非线性耦合评估方法。悬索桥非线性广义刚度分析结果表明,与模拟模态对相比,非模拟模态具有较弱的非线性耦合。
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引用次数: 1
The Durability and SHM System of Hong Kong-Zhuhai-Macao Bridge 港珠澳大桥耐久性与SHM体系
The Hong Kong–Zhuhai–Macao Bridge (HZMB) located at the Pearl River Estuary on the south coast of China, links Hong Kong in the east with Zhuhai-Macao in the west with a total length of 55 km; It is the longest sea-crossing made of artificial island, immersed tunnel and steel bridge in the world, and was opened to traffic in October 2018. The environment where HZMB located is almost the most severe subtropical marine corrosive environments in China, the durability, maintenance and operation are undoubtedly amongst the major work of this project. In the view of the prominence of this bridge, it is a huge challenge for the engineers to achieve this. This paper describes the durability and integrated structure health monitoring system of HZMB.
港珠澳大桥位于中国南岸珠江口,东接香港,西接珠澳,全长55公里;它是世界上由人工岛、沉管隧道和钢桥组成的最长跨海通道,于2018年10月通车。港珠澳大桥所处的环境几乎是中国最严重的亚热带海洋腐蚀环境,耐久性、维护和运行无疑是本项目的重点工作之一。鉴于这座桥的突出,对工程师来说,实现这一目标是一个巨大的挑战。本文介绍了港珠澳大桥耐久性与结构健康综合监测系统。
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引用次数: 0
Study on the Influence of Bridge Expansion Joints on Vehicle-Track- Bridge System 桥梁伸缩缝对车-轨-桥系统影响的研究
Bridge expansion joints (BEJs) are equipped at the girder end of long-span railway bridges to ensure the reliable transition of the track. The track structure of BEJs is more complex than that of bridge, so the BEJs should have suitable dynamic stiffness to ensure the safety and stability of vehicle. Taking a high-speed railway bridge equipped with densely arranged BEJs as an example, a vehicle- track-bridge coupled model was established to analyse the influence of vertical stiffness of BEJs on the dynamic response of whole system. Base on the established model, the study shows that the deformation of the BEJs will cause the short-wave irregularity of the rail and high-frequency impact on the vehicle. The unreasonable stiffness of BEJs will greatly increase the derail risk of the vehicle, so the influence of the stiffness of BEJs on the dynamic response of vehicle should be considered adequately in the design of the BEJs. According to the research results, it is recommended to use a larger stiffness of cushion plate. The results have been applied to the design of the BEJs on the studied railway lines, which are in good service condition at present.
在大跨度铁路桥梁的梁端设置桥梁伸缩缝,以保证轨道的可靠过渡。梁式桥架的轨道结构比桥梁结构复杂,因此梁式桥架应具有合适的动刚度,以保证车辆的安全稳定。以密集布置梁架的高速铁路桥梁为例,建立了车-轨-桥耦合模型,分析了梁架竖向刚度对整个系统动力响应的影响。基于所建立的模型,研究表明,梁架的变形会造成钢轨的短波不规则性和对车辆的高频冲击。不合理的梁架刚度会大大增加车辆的脱轨风险,因此在梁架设计时应充分考虑梁架刚度对车辆动力响应的影响。根据研究结果,建议采用较大刚度的垫板。研究结果已应用于所研究的铁路线路上的折弯机设计,这些线路目前处于良好的运行状态。
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引用次数: 0
Design and Construction of the West Kowloon Cultural District Artist Square Arch Footbridge 西九龙文娱艺术区艺术家广场拱桥的设计及建造
The West Kowloon Cultural District Artist Square Bridge (ASB) is a part of Hong Kong’s new art and cultural district development. It forms a primary pedestrian link between the adjacent MTR station and the new development. ASB is a design-and-build project consisting of a 78m clear spanning, 8m wide footbridge, an access lift tower and a 30m long staircase and escalators. The footbridge is a covered, dual steel arch and Vierendeel truss footbridge, that crosses an existing flyover, connecting the station shopping mall to the new development. During construction of ASB, very limited space was available on the new development site to accommodate the construction of ASB. These posed engineering challenges to the design and construction team. This paper presents the design of the ASB structures with particular focus on the main footbridge, and the challenges encountered during the design and construction of ASB and how incremental launching solution was developed to tackle these challenges.
西九龙文娱艺术区艺术家广场桥(ASB)是香港新文娱艺术区发展的一部分。它是连接邻近地铁站和新发展项目的主要行人通道。ASB是一个设计和建造项目,包括一个78米的净跨度,8米宽的人行天桥,一个通道电梯塔和一个30米长的楼梯和自动扶梯。这座人行天桥是一座有盖的双钢拱桁架人行天桥,横跨现有立交桥,将车站购物中心与新开发项目连接起来。在ASB的建设过程中,新的开发场地上的空间非常有限,无法容纳ASB的建设。这些都给设计和施工团队带来了工程挑战。本文介绍了ASB结构的设计,特别关注主要人行天桥,ASB设计和施工过程中遇到的挑战,以及如何开发增量发射解决方案来解决这些挑战。
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引用次数: 0
Analysis of Influencing Factors of Track Static Geometric Deviation of Super-Long-Span HSR Bridge 超长跨高铁桥梁轨道静力几何偏差影响因素分析
Aiming at deformation characteristics of super-span bridge and track in high-speed railway at the acceptance stage, the key factors to track static geometrics are identified, namely the route profile, surrounding temperature, construction deviation and ballast density deviation. According to the study results, the principles of track profile setting is proposed, and the integrated criteria of midpoint chords based on 60 m, 30 m and 10 m is recommended to determine the track target geometric profile. The optimized track adjustment scheme should meet two conditions, first condition is that the irregularity midpoint chord values should not exceed 6 mm/60 m, 3 mm/30 m and 1 mm/10 m, and second condition is that the adjustment range of ballast thickness should be within ( -20 mm~+100 mm).
针对高速铁路大跨度桥梁和轨道在验收阶段的变形特点,确定了影响轨道静力几何形状的关键因素,即线路轮廓、周围温度、施工偏差和道砟密度偏差。根据研究结果,提出了轨道轮廓线设置原则,并推荐了基于60 m、30 m和10 m的中点和弦综合准则来确定轨道目标几何轮廓线。优化后的轨道调整方案应满足两个条件,第一个条件是不均匀中点弦值不超过6 mm/60 m、3 mm/30 m和1 mm/10 m,第二个条件是镇流器厚度的调整范围应在(-20 mm~+100 mm)范围内。
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引用次数: 0
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IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation
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