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1、Abstract Prestressed concrete hollow slab bridge in the bridge construction of our country occupies my important status, At present, the permanent bridges for the medium and small span, Regardless of is the highway bridge or the bridge in the city, as far as possible the use of prestressed concrete
2、hollow slab bridge, Because this kind of bridge has obtain raw material locally, the industrialization construction, the durability is good, adaptability is strong, has the advantages of good integrity etc.To determine the design of bridge type selection, the calculation method of. This design uses
3、the assembly type prestressed simply supported beam structure, the span of the bridge is ，The upper structure is composed of a main beam, bridge floor part and the support and so on, The girder is the main bearing member of bridge. Bridge floor part composed of bridge deck and railings, These struct
4、ures although is not the bridge main bearing members, but their design and construction is directly related to the safety of the whole bridge function and here in this design has also given a detailed description of. In the design, calculation of the bridge upper structure focuses on the analysis of
5、 the force of bridge in the construction and use of the process of constant load and live load, the dead load the whole set of constant load internal force calculation. Layout according to the new code for highway grade Lane load live load, Calculation and beam reinforcement, loss of prestress steel
6、 strand was estimated, and prestressed phase and use phase of the girder section strength, is checking calculation of the stress and the principal stress. In the design of the main girder load calculation, internal force calculation, the stress steel bar arrangement, the main beam intensity and stre
7、ss checking computations, support he design of the main calculation of main span structure, the side span with structural map design. Key words: Prestressed,Simple hollow board beam, Pretensioning method ContentsIntroduction . . . .11. Simple Prestressed Concrete Hollow Slab Design Of Superstructure
8、 . . 2 1.1 Design Resources . .2 1.2 Structure and size selected . . .2 1.3 hollow hair-sectional geometry calculation . . . .4 1.4 Calculated action effects . . . .6 1.4.1 Calculation of effects permanent action. . . 6 1.4.2 Calculation of variable action effects . . . 7 1.4.3 Combinations in compu
9、ting . . . .16 1.5 prestressed reinforced estimate the number and arrangement of . .19 1.5.1 estimate the number of prestressing steel. . . 19 1.5.2 prestressing steel arrangement . . .21 1.5.3 estimate the number of ordinary steel and arranged .21 1.6 Conversion sectional properties. . .24 1.6.1 Co
10、nversion sectional area . .24 1.6.2 Conversion centroid position .24 1.6.3 transformed section moment of inertia of .25 1.6.4 transformed section elastic resistance moment .25 1.7 ultimate limit state calculation. .25 1.7.1 Flexural Strength calculation of the middle section .25 1.7.2 Shear Capacity
11、 Calculation . .26 1.8 prestress loss calculation . .30 1.8.1 Anchorage deformation, stress losses arising retraction .31 1.8.2 loss temperature difference caused by the heat aging.31 1.8.3 prestressing strand prestressing loss caused due to stress relaxation of.31 1.8.4 Loss of prestressed concrete
12、 elastic compression loss caused by .32 1.8.5 concrete shrinkage and creep, prestressing loss . . 32 1.8.6 prestress loss combination . .35 1.9 limit state calculation . .36 1.9.1 normal section crack resistance checking. 36 1.9.2 oblique section crack resistance checking .37 1.10 Deformation check
13、. 41 1.10.1 deflection during normal use checking .41 1.10.2 Anti camber and camber of prestressing caused Setting .41 1.11 persistent state stress check.44 1.11.1 middle section of concrete compressive stress check Method .44 1.11.2 span Prestressed steel strand tensile stress checking. 44 1.11.3 o
14、blique section main stress check .45 1.12 transient state stress check .48 1.12.1 cross-section Stresses checking.48 1.12.2 L / 4 section stress checking .50 1.12.3 fulcrum section stress checking .50 1.13 minimum reinforcement ratio review .52 1.14 Fissure calculate .53 1.14.1 Fissure calculated sh
15、ear . .53 1.14.2 Checking the shear strength of the hinge joints . .56 1.15Supports Calculation. .57 1.15.1 selected bearing cross-sectional dimension .57 1.15.2 determine the thickness of the holder .58 1.15.3 Checking bearing deflection .59 1.15.4 Checking the stability of the holder .602. Prestre
16、ssed Concrete Hollow Slab Simply Supported computing substructure .62 2.1 Design Resources.62 2.1.1 design criteria and the upper structure .62 2.1.2 Materials .62 2.1.3 pier Size. 62 2.2 Beams cover . 63 2.2.1 load calculation .63 2.2.2 Calculation of Internal Forces .73 2.2.3 reinforcement section
17、 and bearing capacity check. 76 2.3 pier design. 80 2.3.1Utility computing Role .81 2.3.2 Calculation and stress checking reinforcement section . .822.4 Calculation of internal forces and displacements . 84 2.4.1 pile load calculation . 84 2.4.2 Pile Length . 85 2.4.3 Calculation of internal force o
18、f pile . 86 2.4.4 pile longitudinal horizontal displacement calculation .90Conclusions . .92References. . .94Acknowledgements. 953Foreword Select this issue is mainly for the construction unit according to functional requirements for bridge designed to meet a specific function of the bridge, taking
19、into account many factors and other construction costs, the passage of the bridge above the highway - load, because the roads and bridges connected The relatively high level, it is necessary to meet the traffic safety of the vehicle, and must consider the smooth passage of automobiles and the like.
20、In an interview with design tasks in addition to considering the above conditions, or require security applicable, economic, aesthetic, and environmental protection. First, the design according to the specific circumstances of the construction unit and site design requirements, conduct program compa
21、rison, determine the overall form of the bridge; select sectional form and specific dimensions; according to the nature of the material, the use of bridge design software (Dr. Bridges) to bridge the bear the load calculation; remove sections maximum design load; with the carrying capacity of the des
22、ign value of the member be reinforced; were also discussed with the normal use of the design value; and then the bridge deck, expansion joints, bearings and other details were reinforcing member checking; Finally, be prepared substructure dimensions, reinforcement calculation, anti-overturning and a
23、nti-slippage checking. The design of the upper structure of prestressed concrete hollow slab 313m simple structure, easy construction. This design uses prefabricated (PRETENSIONED) construction methods: first-tensioned precast production process is carried out before the first pouring of concrete te
24、nsioning tendons, and temporarily fixed in tension pedestal, and then follow the branch Li template - steel frame molding - Casting and vibrated concrete - basic construction technology maintenance and removal of the template, and once the concrete reaches a predetermined intensity, gradually prestr
25、essing tendons loose, take advantage of tendon retraction and bond between concrete the role of the member to obtain prestressed.Advantages: high strength reinforced prestressed concrete structure by preloading, not only give full play to the characteristics of the high-strength material, but also i
26、mprove the cracking of concrete, promote structural weight reduction, which has a much larger than prestressed concrete structures reinforced concrete structures spanning capacity.The use of hollow cross section, reducing weight, but also to take advantage of material, component shape simple, easy t
27、o produce and easy construction, short construction period, and the bridge-smooth appearance.Disadvantages: traffic flow, while operating high maintenance costs of the bridge late.1 Simple Prestressed Concrete Hollow Slab superstructure design1.1 Design Resources(1). span: Standard span = 13.00m; Ca
28、lculation span L = 12.60m;(2). Deck Width: 11m + 0.5m 2;(3). the design load: car load: Highway - stage of loading;(4). Environment Standard: class environment;(5). Material: prestressed reinforced: The nominal diameter d = 15.2mm high strength low-relaxation strand, non-prestressed reinforcement us
29、ing HRB335, R235; precast hollow, hinge joints, cast layer using C50 concrete deck; asphalt concrete bridge deck using C40; using C20 concrete railing; vent pipe using 12 cast iron pipe; bearing using laminated rubber bearing; use Q235B steel plate.(6). the design basis and reference books: General
30、Specification for Highway Bridge Design (JTG D60-2004); highway reinforced concrete and prestressed concrete bridge design specifications (TG D62-2004); highway bridge foundation and foundation design specification (JTG D63-2007); Highway Engineering Technical Standards (JTG B01-2003); road masonry
31、bridge design specifications (JTG D61-2005); highway reinforced concrete and prestressed concrete bridges and culverts PROVISIONS example, Lun Yuan a, Bao Weigang eds., China Communications Press, 2005; Reinforced concrete and prestressed concrete structural design principle, Zhang Shuren, Gui Cheng
32、 Shao-eds, China Communications Press, 2004; highway bridge and culvert design examples Liupei Wen, Zhou Wei, eds, China Communications Press, 2005.1.2 Construction and dimensioning The design of the bridge clear width of 11m + 0.5m 2, the full bridge using precast prestressed concrete hollow slab 1
33、1 C50 of each hollow plate width 99cm, height 70cm, hollow plate full length 12.96m. Using the first-tensioned construction Technology, the use of the use of prestressing steel, nominal diameter d = 15.2mm high-strength low-relaxation strand cross-sectional area of 140mm2.，Relaxation rate = 0.035, r
34、elaxation coefficient = 0.3, prestressing strand span extension board layout, Severe C50 concrete hollow slab = 26.0, elastic modulus. Full bridge hollow cross-section is arranged in Figure 1-1, each hollow structure as shown in cross-section and 1-2 and 1-3. Figure 1-1 superstructure standard cross-section layoutFigure 1-2