桥梁工程专业英语

1、不对称连续钢构桥受力分析When building a continuous girder bridge in the mountain area with rugged terrain，the amount of piers will increase. As a result，the total construction cost will rise .Moreover ,if the cantilever construction method is chosen ,the amount of provisional anchorage devices will increase ,wh

2、ich will also arise the construction difficulties .In this case , a continuous rigid frame bridge is preferable with its large span capacity and its convenience in the construction process where it requires no system conversion .Normally a continuous rigid frame bridge is arranged symmetrically。Howe

3、ver ,in some cases such as an unfavorable topographic condition or a restricted navigation condition，an unsymmetrical arrangement is usually selected .Generally，there are two kinds of unsymmetrical continuous rigid frame bridges regardless of curved ones :the one with unsymmetrical longitudinal span

4、s ,and the one with piers having height differences .And in the practical projects，there are those with both features mentioned above .Under load action an unsymmetrical continuous rigid frame bridge will have unsymmetrical internal forces and deformations，which is different from symmetrical ones .T

5、herefore，it is necessary to study on unsymmetrical rigid frame bridge .Based on project of western region a very good application examples of asymmetric continuous rigid framethe Yantou River Bridge in Sinan county in Guizhou province，an analysis on unsymmetrical continuous rigid frame bridge is car

6、ried on with the help of finite element program .Several aspects studied in this paper are as follows.(1) Set up a finite element model of a continuous rigid frame bridge with unsymmetrical longitudinal spans. Keep the three parameters of pier of one side，including the height, the width in the longi

7、tudinal direction and the spacing of double thin-wall，and change those three parameters of the other side. Then compare and analyze the internal force and deformation of piers under load action. By that, features of internal force and deformation of continuous rigid frame bridge with both unsymmetri

8、cal spans and different pier heights can be acquired.(2) Set up another finite element model, a continuous rigid frame bridge with symmetrical longitudinal spans. Keep the height of pier of one side, and change the height of pier of the other side. Then compare and analyze the internal force and def

9、ormation of piers under load action and try to find out the characteristics of internal force and deformation of continuous rigid frame bridge with symmetrical spans but different pier heights.(3) By contrast and analysis of the layouts of tendons of an unsymmetrical rigid frame bridge (The Yantou R

10、iver Bridge) and a symmetrical rigid frame bridge (The Second Wujiang River Bridge), draw some conclusions on their similarities and differences .Analyze the location differences of mid-span tendons control section of symmetrical and unsymmetrical rigid frame bridge and find out the variation trends

11、 of mid-span tendons control section of unsymmetrical rigid frame bridge.桥梁大体积混凝土结构温度应力及其敏感性因素分析With the rapidly expanding of our country transportation，the capacity of bridge design and construction technology by leaps and bounds，lots of massive bridge concrete structures have been made. But also m

12、any problems appear. One obvious problem is that as a result of big-size and complexity of the structure, the temperature stress surpasses the limits frequently，the temperature cracks come along.The temperature stress as well as the resultant stress cracks are the factors which must been considered

13、in the designing. In the new code for design of highway bridges and culverts which has been further stressed，it tells us the factor can not be neglected in the project. Although engineers have become aware of this problem，and many specialists have also done a lot of studies，but some problems are sti

14、ll there，we need do more still.The paper pays more attention to the analysis suited to bridge structure for the difference between massive concrete bridge structure and the general structure.Firstly the status of the research on the mass concrete and its related theory is simply described in the pap

15、er，although not much，but it has layed the necessary theoretical basis.In the Chapter IV，some research about the temperature stress of the massive concrete structures and its related factors is done. In this paper，only a few key aspects of the analysis have been studied，for example，the relationship b

16、etween the rate of water flow and cooling efficiency the depth effect of outside temperature，the effect of structure size on the stress distribution，as well as simplification of the boundary conditions. Every aspect is derived with theoretical deduction and finite element method，and more analysis is

17、 made for the bridge structure so as to get the conclusions used for the structure of massive concrete.斜拉桥大吨位曲线混凝土箱梁在拖拉施工中的控制The main bridge of railway separated interchange on Jing-xin Highway is a single tower and single cable Plane cable-stayed bridge with five spans curved prestressed continue c

18、oncrete beam. It is a tower and pier consolidation system, and the girder is supported by the tower and pier. This bridge connected Jing-Bao railway，13th urban railway and Jing-Zhang Inter-city railway. There are many technical difficulties and challenge in the construction of this bridge which are

19、either rare or unprecedented in the construction practices both domestic and abroad. Take this bridge as the engineering background，this paper analyzed the hualing process， details are as follows:(l)The hualing construction of large- tonnage curve concrete box girder . Pushing and hualing constructi

20、on is one common method in bridge construction .But it is rarely used for large- tonnage curves for concrete box girder. The hualing girder section has a horizontal elevation radius of 3500m，cross slope of bridge deck change dramatically ;besides，the elevation radius is 11000m. The conditions of spa

21、nning over railways increase the difficulties of construction .To ensure that the beam would be moved along within the drag track，and prevent great lateral displacement ，ensure structural safety during the hualing，accurate and reliable theoretical calculation and strict construction control measures

22、 are needed .This paper used finite element analyzed the drag construction of main beam.(2)The hualing construction control and structural stress monitoring .The real-time monitoring of the stress of girder and temporary pier during hualing process is commenced ;the results are compared with the theoretical solution .The accuracy and the speed