公路桥梁桥头跳车防治技术和措施

针对桥头跳车这一常见的公路工程质量缺陷，分别介绍了针对地基、路基、路面的桥头跳车防治技术和措施，并阐述了各种措施的施工工序及优点，指出桥头跳车的防治是一项综合系统的工程，需要各相关单位密切配合，从多方面入手。     

关于桥头跳车问题的浅析

针对公路桥头跳车问题越来越突出的现状，分析了桥头跳车的原因，在此基础上提出了相应的防治措施和修补办法，以期从根本上解决桥头跳车问题，从而提高道路运输业的安全性和降低工程造价。     

宿迁市市府东路特大桥冬季施工措施研究

以宿迁市市府东路特大桥为背景，在叙述混凝土冬季施工一般原理的基础上，就骨料预热、混凝土的拌制、运输、灌注与养护等冬季施工措施进行了研究，实践表明上述措施有效地确保了施工质量和施工进度，取得了良好的效果。     

浅谈桥梁浅基础水毁原因与防治加固对策

从桥位选址、河床自然交迁、人为因素干扰等方面分析了桥梁常见水毁病害的成因，在此基础上归纳了新建桥梁的预防措施，探讨了老桥基础的防治对策，指出应坚持预防为主、综合治理的原则，加强施工管理，确保桥梁安全运行。     

公路立体交叉工程管理探讨

公路立体交叉是在拟定建设公路的时，把公路与原有公路在同高度相互交叉的一种形式，在建设过程中的主要特点是需要设置跨线设施。本文主要对公路立体交叉工程进行了分析与研究，以供同行参考。     

连续管磨钻工艺的研究与应用

钻铣桥塞是解决水平井分段压裂后续问题的关键技术。常规钻铣工艺通过普通油管加钻铣工具来实现,但存在工具下入困难、施工周期长等问题。为此,开发了连续管磨钻工艺技术。该技术通过水力液压动力带动磨鞋高速旋转,对井内堵塞物进行钻磨,磨铣成细小碎屑返出,使井筒畅通,以方便进一步的返排和生产作业。2口井的现场应用结果表明,连续管连接钻铣工具易下入水平井段,可实现边钻铣边冲砂连续施工,具有带压作业、施工周期短及效率高等优势。     

Measurement-based traffic loading assessment of steel bridges – a basis for performance prediction

The Europabrücke, a well-known Austrian steel bridge near Innsbruck that was opened in 1963, is one of the main alpine north–south routes for urban and freight traffic. Currently the bridge is stressed by more than 30,000 motor vehicles per day (approximately 20% freight traffic). The superstructure is represented by a steel box girder (width = 10 m, variable height along the bridge length = 4.70–7.70 m) and an orthotropic deck and bottom plate. This motorway bridge with six spans of different lengths (longest span 198 m, supported by piers with an elevation of 190 m) and a total length of 657 m comprises six lanes, three for each direction distributed on a width of almost 25 m. It represents a bridge generation where bridge designers acted on a maximum of building material economisation. A long-term preoccupation of Vienna Consulting Engineers with the bridge monitoring system BRIMOS® on the Europabrücke (since 1997), with regard to fatigue problems and possible damage, led to the installation of a permanent monitoring system in 2003. As lifetime predictions in modern standards depend on lots of assumptions, the emphasis is to replace those premises (referring to loading) by measurements. A dynamic weight registration procedure for freight traffic (the major feature of the permanent monitoring system), mainly based on a pattern recognition algorithm, is introduced.     

The use of micro-simulation for congested traffic load modeling of medium- and long-span bridges

This paper presents a new approach to the modeling of congested traffic loading events on long span bridges. Conventional traffic load models are based on weigh-in-motion data of non-congested traffic, or something similar to a Poisson Arrival process. In neither case do they account for the mixing between lanes that takes place as traffic becomes congested. It is shown here that cars move out from between trucks as traffic slows down which results in a higher frequency of long platoons of trucks in the slow lane of the bridge. These longer platoons increase some characteristic load effects under the slow lane by a modest but significant amount. Micro-simulation, the process of modeling individual vehicles that is widely used in traffic modeling, is presented here as a means of predicting imposed traffic loading on long-span bridges more accurately. The traffic flow on a congested bridge is modelled using a random mixing process for trucks and cars in each lane, where each vehicle is modelled individually with driver behaviour parameters assigned randomly in a Monte Carlo process. Over a number of simulated kilometres, the vehicles move between lanes in simulated lane-changing manoeuvres. The algorithm was calibrated against video recordings of traffic on a bridge in the Netherlands. Extreme value statistics of measured strains on the bridge are then compared to the corresponding simulation statistics to validate the model. The micro-simulation algorithm shows that the histograms of truck platoon length are moderately affected by lane changing. This in turn is shown to influence some characteristic load effects of the bridge deck.     

某高速匝道独柱墩连续箱梁桥横向抗倾覆稳定性分析

针对独柱墩连续箱梁桥在汽车超载或偏载作用下横向易失稳的问题，总结了横向失稳坍塌的过程，分析了其失稳机理，然后阐述了独柱墩桥横向失稳的判别准则和计算方法，并对某高速匝道独柱墩连续箱梁桥进行分析，验算了其横向倾覆安全系数、支座脱空和支座转角，验算结果表明其横向倾覆稳定性满足安全运营的要求。     

钢桥静载试验结果偏差原因分析

某钢结构人行天桥的静载试验结果与理论分析结果偏差较大,为查找原因,首先深入分析试验结果的特征,推断出其主要原因,然后通过进一步的有限元理论分析证明了这种推断的准确性,最后还讨论了这种偏差导致结构受力的变化。