查询词典 span bridge

The main works are as follows: 1 The developingt history of the traffic load on bridges is represented. Typical bridge codes in some countries are discussed and these traffic load models are comparative analyzed. Analysis shows that the influence of layout axle for the total traffic load effect on bridge gradually becomes smaller with the increase of bridge span. So most national norms use the distributed load as the equipollent load of traffic load.

主要内容包括下面几个方面： 1阐述了桥梁汽车荷载发展的简史，讨论了部分国家典型的桥梁汽车荷载设计规范，并对这些荷载模型进行了对比分析，分析表明随着桥跨的增大，车轴布置对桥梁整体荷载效应的影响逐渐变小，因而大部分国家的规范都把均布荷载作为车辆的等代荷载。

According to theory analysis and example computation, the following conclusions are obtained.1. During the analysis on the cable shape in the suspension bridge"s completion state, the pre-displacement of saddle and the case that the cable and stiff girder commonly bear the second-stage dead load should be considered.2. When supposing the construction ideal initial state in the first time, if the initial state model is established according the cable"s span central sag in the bridge"s completion state, and the reasonable correction formulation is created in the iteration process, the result can converges fast.3. The cable shape in the bridge"s completion state is not parabolic, nor catenary. It is between parabola and catenary. Actually it is funicular polygon closer to the catenary.

通过理论分析和实例的计算表明：1在悬索桥主缆成桥线形分析过程中，须考虑主塔鞍座的偏位以及二期恒载由主缆和加劲梁共同承担的实际情况；2在第一次假设施工理想初态时，以成桥状态已知的主缆跨中垂度建立施工理想初态模型，同时在迭代计算的过程中，建立合理的修正公式，才能使收敛的速度快：3在成桥状态时主缆的线形既不是抛物线，也不是悬链线，而是介于抛物线与悬链线之间，更接近于悬链线的索多边形。

On the North River Bridge Weicheng CFST arch main bridge construction S233 Provincial Highway Bridge (Gaoyou Depalletizing three to Jiangdu Port Section) under a span of 80.6m CFST arch, rigid tie beam for 1.4m × 1.8m pre-stressed box girder, cast-in-place method using stent Construction .

浅谈北澄子河大桥钢管砼拱主桥施工大桥为S233省道的一座跨径80.6m的下承式钢管混凝土拱桥，刚性系梁为1.4m×1.8m预应力箱形梁，采用支架现浇方法施工。

Until 1750, when Westminster Bridge was opened, London Bridge, first built in the 10th cent., was the only bridge to span the Thames.

是唯一的桥梁，横跨泰晤士河。

A conclusion is given that the cable-stayed arch bridge is novel and artistic. It is more important that the arch axile force of the cable-stayed arch bridge may adjust, thus, the bridge may develop to the great span direction.

由此得到结论：斜拉拱组合桥不仅桥型新颖美观，更重要的是拱肋轴力可调，该拱桥桥型可以向大跨度方向发展。

A Bascule Bridge can span the longest distance because of its light weight. Arched Bridge: A curved arch is fixed at both banks to support the bridge.

吊桥能跨越最长的距离，因为它们重量轻；拱桥：一道弯曲的桥拱牢固地固定在两岸，支撑起桥梁。

First across a wood bridge, being the middle span of it, hear the sound of "Caca", and the bridge is broken with our car down. We are shocked after the var passes over, the bridge reform to the original style!

先是经过一座木桥，到了桥中央，只听桥咯砟一声响，桥断了，我们的车也向下一沉，咯噔一声，吓人一跳，车过以后，桥又恢复原状！

In recent decade, with the rapid development of transportation enterprise, many long-span bridges have been constructed or constructing, for deceasing load and increasing the span, the orthotropic steel deck is generally applied for the long-span steel bridge.

近十年来随着交通事业的快速发展，已建成或正在建设的大跨径桥梁逐渐增多，为了减小桥梁自重和增大跨径，大多数钢桥的桥面板一般采用正交异性钢桥面板。

Haihe River Bridge opened by the East and West Approach and the main bridge consists of three parts, the main bridge structure is designed to enact rotary steel beam, the net cross 68 meters, turning radius of 35 meters, beam rotation angle of 85 degrees, at the international bridge in the same belong to large-scale, long-span bridges of legislation to open one of the rotor.

海河开启桥由东西引桥和主桥三部分组成，主桥结构设计为立转式钢结构悬臂梁，净跨68米，转动半径为35米，梁端转动角度为85度，在国际同类桥梁中属于大规模、大跨径的立转式开启桥之一。

Using the models, the author has also calculated the vibration response to high speed railway vehicles of three types travelling over simply-supported beam bridges with various span lengths respectively. Based on the analysis of the computation results, the concept of resonance velocity of a bridge under a high speed running vehicle is present, and it is pointed out that comparatively great vibration of bridges on high speed railways is caused by bridge resonance resulted from the static force pulsating. In a vehiclebridge coupling vibration system, the damping constant of the axle spring is the main factor affecting the response variable of bridge velocity resonance, and the influence of track irregularity on bridge vibration on high speed railways is rather smaller.

利用所建立的计算模型，计算了三种形式的高速铁路车辆通过各种跨度简支梁桥结构时的振动响应，对所得到的计算结果进行了详细的分析，提出了高速行车下桥梁共振速度的概念并指出高速铁路桥梁产生较大振动的原因是静力脉动引起桥梁共振造成的；通过研究车—桥耦合振动系统方程的参数后指出，在车—桥耦合振动系统中，车辆—系阻尼的大小是影响桥梁速度共振时响应大小的主要因素，轨道不平顺对高速铁路桥梁振动的影响较小。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。