东莞水道特大桥设计Design of super large bridge of Dongguan waterway.docx

1、东莞水道特大桥设计Design of super large bridge of Dongguan waterway东莞水道特大桥设计（Design of super large bridge of Dongguan waterway）In view of the complicated hydrological conditions at the bridge site, the Dongguan Water Conservancy Survey and Design Institute puts forward the requirements. If the pier is set up

2、 in the water, the piers should be arranged along the direction of the flow, that is to say, the main bridge should be made into a skew bridge. After comparing many schemes, finally using three 50+280+50m CFST Tied Arch bridge. This type of bridge is not only beautiful in appearance, magnificent and

3、 modern, but also novel in conception and reasonable in structure. At the same time also can meet the navigation requirements of Dongguan waterway, avoid the bridge deep water foundation, reduce the main girder of the building height, thereby reducing the length of the bridge approach, so it is a be

4、tter bridge bridge the city on the road. The general layout of the bridge is shown in figure 1.Fig. 1 general layout drawingAttachment: your user group is unable to download or view attachmentsPosts 4728 essence 8 prestige 850 civil currency 978 online time 0 hours registration time 2004-11-8 view d

5、etailed informationTOPScfeifei518StupidcolonelPosts 4728 essence 8 prestige 850 civil currency 978 online time 0 hours registration time 2004-11-8 send short message to friend 68# big and small published at 2005-8-25 10:12, only see the authorDesign of super large bridge of Dongguan waterway (Contin

6、ued)Three supported rigid frame tied arch thrust and to balance with two semi cantilever arch, also known as self balanced arch, self balance type, or the birds flying swallow type. The biggest characteristic of concrete steel tubular arch of the birds is to give full play to the performance of the

7、material, with high compressive strength of concrete filled steel tube as the arch rib, with high strength steel wire tensile ability as the rod through the side arch rib weight, construction loading gradually tension in prestressed cable tied with horizontal thrust to balance arch the final form of

8、 1 arch bridge arch support only a small horizontal thrust. This has greatly reduced due to the huge imbalance in the cost basis of arch thrust increased, so that the arch beam bridge as the foundation becomes like light, provides a new bridge for the river and adverse geological areas, construction

9、 of large span arch bridge. Flying bird type concrete filled steel tube arch bridge is adopted by city bridge because of its beautiful appearance. According to the natural condition of bridge site, the birds arch CFST arch bridge with span of 280m is adopted in the super large bridge of the waterway

10、. The main bridge, such as Dapeng wing, has magnificent momentum and beautiful shape, and it will become a big landscape and landmark building in Dongguan.The main design points of 4 main structureThe main arch span is 271.5m, and the vector height is 54.3m. The ratio of rise to span is 1/5, and the

11、 arch axis coefficient is 1.5. Camber value of vault in 0.45m.The main span arch rib adopts the concrete-filled steel tube space truss structure, and the intercostal space is between 19.5m. The main hole of Gonglei cross-section, the arch height is 5.5m, the width is 2.5m, the upper and lower chord

12、pipe of Q345c steel pipe concrete arch foot 1000 16mm, the first section of pipe wall thickness increased to 1000 18mm. Q345c steel plate with transverse thickness between chord and tube is 12mm thick. 50 micro expansion concrete is filled in chord and batten plate. The empty steel tube with 500 12m

13、m Q345c abdominal tube. The arch rib from the arch to arch above about 2m concrete-filled steel tubular structure, the concrete filled with the whole section. The main arch rib structure is shown in figure 2.A parallel wind bracing is arranged at the vault between the arch ribs, and 12 K shaped wind

14、 supports are arranged on both sides of the vault.The balance arch of the arch is mainly arch, the arch rib is a half span 50m arch structure, and the reinforced concrete solid section is adopted. The section size of the end beam is 4.0m 3.19M (Gao Kuan), and the other position is 4.0m 2.5m (Gao Kua

15、n). The end of the arch is anchored with a strong prestressed steel wire tie bar, and the side span is a beam structure with externally prestressed cables.There are 49 pairs of 98 hangers in each half bridge. Between the main arch intercostal beam and the double boom beam, the center distance betwee

16、n the suspension points is 7.5m, the double suspender structure; the rest of the suspension center spacing is 5m, which is the single suspender structure. Each boom is 91 7mm galvanized high strength and low relaxation prestressed steel wire. The standard strength Ryb of steel wire is 1670MPa, and t

17、he suspender is PE double layer protection,Adjustable cold casting pier head anchor is used for upper and lower ends.Each arch rib tie is made of 16 bundle 31 j15.24 steel strand. The standard strength of steel strand is Ryb=1860MPa. PE protection. The steel bundle of the tie bar is arranged between

18、 the inner and outer sides of the arch rib and the middle of the arch rib, and both ends are anchored on the end beam of the side arch, and the replaceable special anchor is adopted.The deck system consists of beams, stiffening stringers and carriageway plates. The longitudinal beam is rectangular c

19、ross section and is fixed on the crossbeam.The beam and column beam for prestressed concrete box section beam, a component, length 26.1m, width 0.8m, height 1.6221.722m; main arch rib beam for the steel structure, the box section beam, length 26.1m, width 1.2m, height 1.5m. The reinforced concrete s

20、tructure of the arch rib and the end beam is 40 reinforced concrete structure.The deck in side arch end span using solid reinforced concrete plate; the rest were reinforced concrete plates, plates of high 0.350.45m.The rear pouring layer of the bridge is poured with 10cm thick 40 steel fiber concret

21、e, and the steel mesh is installed inside. The bridge deck pavement is 5cmSMA modified asphalt.The main arch cap for solid reinforced concrete structure, abutment is separated from the solid reinforced concrete structure, the middle is connected by a tie beam. The main pier foundation is 24 1.8m bor

22、ed piles, the length of the pile is 17.022.9m, which is the rock socketed pile. The side pier is 1.8m double column pier, because of the geological condition is different, Z0 pier foundation is 1.2m bored pile, and Z3 pier foundation is 1.5m bored pile.Fig. 2 arch rib structurePosts 4728 essence 8 p

23、restige 850 civil currency 978 online time 0 hours registration time 2004-11-8 view detailed informationTOPScfeifei518StupidcolonelPosts 4728 essence 8 prestige 850 civil currency 978 online time 0 hours registration time 2004-11-8 send short message to friend 69# big and small published at 2005-8-2

24、5 10:14, only see the authorDesign of super large bridge of Dongguan waterway (Continued)Calculation points of 5 main structure5.1 computational modelThe structure is calculated by ANSYS program. In the calculation model, the upper bridge consists of arch ribs (rib, reinforced concrete arch rib conc

25、rete filled steel tube arch side), boom (single, double suspender suspender), column, beam, beam (main beam, arch rib side arch beam, beam column, intercostal suspender beam), bridge deck, repair Road and sidewalk plate plate the lower part of the bridge; including main span of abutment and pile cap

26、 and pile foundation; side span pier, abutment and foundation. The calculation model is the whole space model of the bridge composed of the upper and the lower parts. The calculated cell model is shown in figure 3. There are 2866 nodes in the space model, including 5836 units. There are 52 kinds of

27、unit types.Figure 3 the axis side view of the space model is attached5.2 load combinations and load casesAccording to highway bridge and culvert design code JTJ 021-85 2, the operation stage mainly considers 3 kinds of load combinations.Design load I: 1.2 (0.9) dead load +1.4 (car load + crowd load)

28、Design load II: 1.2 (0.9) constant load +1.4 (car load + crowd load) + temperature loadDesign load III:1.2 (0.9) constant load +1.1 trailer loadAccording to the internal force influence line of each section, the main section load condition of arch rib is:Working condition 1: arch foot thrust maximum

29、Working condition 2: maximum negative moment of arch footWorking condition 3: maximum bending moment of arch footThe maximum negative bending moment of 4:L/8 sectionMaximum positive bending moment of 5:L/8 sectionThe maximum negative bending moment of 6:L/4 sectionMaximum positive bending moment of

30、7:L/4 sectionWorking condition 8: the maximum bending moment of vaultWorking condition 9: maximum negative moment of vault5.3 strength and deformation checking computationsThe internal forces under various conditions by calculating the internal force combination to calculate the various loads, the d

31、ifferent chord axial concrete design specification for concrete filled steel tubular structures CECS 28:90 3 checking calculation of steel pipe single limb column bearing capacity, can meet the requirements. For the sake of space, this paper does not introduce the specific calculation process and re

32、sults.The maximum deflection of bridge deck under different conditions is calculated to be 29.07CM is less than the allowable deflection of 2 specified in bridge regulation L/800=35cm, therefore, the bridge stiffness meets the design requirements.5.4 overall stability checkingThe overall stability of the operation stage is calculated by a class of elastic stability. Under the action of dead load, the first order instability mode of the structure is shown in Figure 4, and the stability coefficient is 5.706.Fig. 4 the structural instability mode under the acti