为分析列车制动力和温度荷载对小半径曲线上带减振扣件整体道床轨道横向力学特性的影响，为小半径曲线上无砟轨道设计提供理论依据。参考贵阳地铁1号线带减振扣件的整体道床结构形式，简化钢轨-桥梁-墩台垂向耦合力学模型，应用有限单元法，计算分析不同列车制动力和温度力对小半径曲线桥梁轨道结构横向力学特性的影响。计算分析结果表明：从无砟轨道稳定性角度出发，对于在有小半径曲线桥梁上的带减振扣件的承轨台整体道床轨道，建议当圆曲线半径为450 m时，扣件横向刚度要大于5×107 N/m；当扣件横向刚度为5×107 N/m时，圆曲线半径要大于450 m；当扣件横向刚度为1×108 N/m时，圆曲线半径要大于350 m。当圆曲线半径为450 m时，为减小制动力对曲线钢轨的影响，建议尽量减小曲线长度，缩小钢轨横向位移值。

The research in this paper analyzed the mechanical characteristics of monolithic track bed with damp-ing fasterners under the braking force and temperature load on the continuous long ramp with small -radius curves,and provided theoretical basis for the design of ballastless track of the small -radius curves.On the background of the structure of monolithic track with damping fasterners of Guiyan subway,the vertical coupling model of rail-bridge-pier was established,and the finite element method was utilized to calculate and analyze the influence of transverse mechanical properties on the track of small radius curve bridge under braking force and temperature load.The results show that,from the point of stability of ballastless track,for the monolithic track bed with damping fasterners on small radius curve bridge,when the circular curve radius is 450 m,fastener transversal resistance is greater than 5 ×107 N/m;when the fastener transversal resistance reaches to 5 ×107 N/m,ci

小半径曲线箱梁在立交跨主线匝道桥中较为常用,其跨径往往都超过50m,半径100m至250m之间。小半径曲线悬浇箱梁相对于常规的支架现浇曲线连续箱梁,其受力特性受其施工方法的影响有着较大不同。以国道主干线广州绕城公路南环段东涌互通立交C匝道50m主跨曲线半径150m的悬浇箱梁为例,通过计算分析,对其受力特性进行了分析,并针对其受力特性提出了优化方案。

Small radius curved box girder is more commonly used, which often span more than 50m, with a radius be-tween 250m and 100m. Small-radius curved cantilever-cast-in-place box girder, compared with cast-in-situ continuous box girder with falsework, has a greater difference of stress characteristics affected by the construction method. In this paper, taking a 50m span curved cantilever-cast-in-place box girder with a radius of 150m at Ramp Bridge C of Dong-chong Interchange as an example, through calculating and analysis, its stress characteristics have been studied and opti-mization solutions have been proposed.

天津地铁1号线线路经过7年多的运营后,小半径曲线地段钢轨产生了不同程度的的波磨、疲劳掉块、焊缝凹陷等钢轨病害。为改善线路钢轨状态,使用钢轨打磨车对全线小半径曲线钢轨进行了打磨整治,并对钢轨打磨过程中的难点和打磨后的效果进行了分析。

Tianjin metro line 1 after more than seven years of operation, rail defects occurs on small radius curves, including varying degrees of rail corrugation, fatigue shelling, welds depression etc. In order to improve the state of rail on track, rail grinding train is used for grinding rails on small radius curves. The paper analyzes the difficulties in the process of rail grinding and grinding effect.

针对驾驶员驾驶安全舒适性特性,以我国双车道公路不同线形组合路段划分标准为研究对象,引入驾驶员驾驶工作负荷理论和驾驶工作负荷度计算模型,通过对驾驶员在双车道公路不同平曲线半径和纵坡坡度条件下的动态驾驶试验方案设计,采集了36名驾驶员在双车道公路不同平曲线半径和纵坡坡度上行车时的运行速度和心电指标数据;在此基础上通过驾驶员在驾驶过程中眼动视频的分析处理,得到小客车和大货车驾驶员在双车道公路不同平曲线半径和纵坡坡度线形、自由流条件下行驶时的驾驶工作负荷度变化规律,发现不同的平曲线半径和纵坡坡度对驾驶员驾驶工作负荷度的影响不同,并确定了满足驾驶安全舒适性的平曲线半径和纵坡坡度划分阈值,最终提出了基于驾驶工作负荷度的双车道公路不同线形组合路段划分标准.

In view of driver safety and comfort, this paper researched the classification of various combined alignment section on two-lane highway, and introduced the theory of driving workload and the calculation model of driver workload degree. During the experiment, 36 drivers’ ECG indicator and operating speed data in different two-lane highway horizontal curve radii and longitudinal slopes were collected, and eye movement videos were analyzed. Then, the variation of the driving workload of car and truck drivers on various combined alignment sections with different horizontal curve radius and slope grades on two-lane highway was obtained. It is found that the different horizontal curve radius and slope grades had different effects on the driver workload degree. The divided threshold of horizontal curve radius and slope grade was got, which could meet the driver safety and comfort. In addition, the standard of various combined alignment sections on two-lane highway based on the dri

兰州至中川铁路西固黄河特大桥主桥采用（80＋2×120＋80）m预应力混凝土连续刚构跨越黄河,主桥位于半径800 m的曲线上。本文介绍了主桥的设计情况,并进行了直线、曲线桥梁对比分析,从支反力、内力、变形、预应力损失、自振特性等方面给出了直线、曲线分析模型的计算结果,对于认识及理解小半径曲线桥梁的受力特性具有参考价值,对类似桥梁的设计具有指导意义。

The main part of the Xigu Yellow River Bridge on Lanzhou-Zhongchuan railway is a prestressed concrete continuous rigid frame bridge ( 80 +2 ×120 +80) m. It is across the river and located on a curve with the radius of 800 m. In this paper,the design of this bridge was introduced and the difference between a linear and a curved model was analyzed. T he reaction force,the internal force,the deformation,the prestress losses and the dynamic characteristics of the two models were calculated. T his comparison helped to further understand the behavior of this type of bridges on the small radius curve.