Prestressed Concrete Technology 预应力混凝土 英语论文.doc
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1、Prestressed Concrete Technology 提纲:摘要:预应力混凝土的定义 正文:预应力混凝土的应用、实例应用讨论:预应力混凝土的优点和缺点总结:预应力混凝土的发展的前景IntroductionPrestressed concrete and reinforced concrete in principle are clearly different. In the design of the reinforced concrete beams, regardless of the concrete can be assumed that the tensile stren
2、gth, for bending moment of tension is caused by reinforced to resist, the tension is through between reinforcement and concrete bonding and passed to the steel. For large scale craze and deformation for, although the high strength concrete has good bonding, to a great extent can restore; But in the
3、concrete and steel bonding between poor ordinary concrete, is in fact cant recover. On the other hand, in the prestressed concrete, the purpose of prestressed reinforced by rapping or through the special is the anchorage to exert a force concrete, so all can have the function of concrete structure.
4、Requirements of prestressed steel is used to produce active component in advance to add load, and cracking and deformation in larger extent can be restored.AbstractIn order to avoid reinforced concrete structure of the premature fracture, make full use of high strength steel and high strength concre
5、te, tried to in the concrete structure or structures under load before use, through the force applied, make by the tensile stress components is reduced, and even in pressure stress state of concrete component.Preloading stress is used to reduce or offset load caused by the concrete tensile stress, a
6、nd the structure of the components in the smaller tensile stress control range, and even in the compression state, to delay the generation of crack in concrete and development, so as to improve the anti-cracking performance component and rigidity.Main textPrestressed concrete component to the method
7、 of pretensioned stressing and posttensioned.1.pretensioned stressingIn the concrete pouring, first by steel wire steel strand or will be composed of the prestressed tendon pulled to a specified stress, and the anchorage anchor in a pier at both ends pedestal, then installation template, the structu
8、re, steel and parts, and then pouring concrete and maintenance. When concrete after the specified strength, relax a pier at both ends of the tendons, through the bond will be the prestressed concrete and tension to produce preloading stress. A method based on first relatively advantageous pedestal l
9、ong, the longest useful to more than one hundred meters, so sometimes called long term method.2. Posttensioned.Firstly perfusion components ,then directly on prestressed method in the component. The general method is placed first after prestressed reinforcement of hole into a casing, the structure,
10、steel and parts, then install the template and pouring concrete. Tendons first through the casing can also wear after. Concrete to strength, with a jack will introduces the pull to the stress and load demand anchor at each end of preloading stress at both ends by the anchorage to concrete component.
11、 In order to protect the tendons from corrosion and restore prestressed concrete and between the rapping, prestressed steel casing and the space between the water filling slurry must be real. Water in the mud up preservative effect, but also beneficial to restore prestressed concrete and between the
12、 rapping. In order to facilitate the construction, sometimes also can be used in the prestressed steel surface coating corrosion materials and plastic casing or oiled paper parcel of unbonded post-tensioned pre-stressing concrete muscle.The characteristics of prestressed concrete. (1).Improve the co
13、mponent of crack resistance. Because of a bear before the loading of prestressed concrete structures in the tension zone for preloading stress exists, so outside load, only when the prestressed concrete is all turned to offset the tensile and tensile strain is more than concrete ultimate tensile str
14、ain, component will craze. While general reinforced concrete structure are not present in the prestressing, the cracking of the size of the load only by concrete ultimate tensile strength, compressive strength for about 1/10 of the) have decided, and crack ability is very low.(2). Increase the stiff
15、ness of the component. Because of the prestressed concrete component of normal use, in the load effect under standard combination may not cracking or only a small cracks, concrete was basically in the elastic stage work, and the stiffness of the component than ordinary reinforced concrete member is
16、increased.(3). Make full use of the high strength materials. As mentioned previously, common reinforced concrete members cant make full use of high strength materials. And prestressed concrete component, prestressed reinforced first is expected to pull, and then out load reinforced stress further in
17、creases, and should be always in high tensile stress state, that is, can effectively use high strength reinforced; And the strength of reinforced high, can reduce the need to the section area. At the same time, should as far as possible using high strength grade of concrete, and high strength steel
18、to coordinates, to get better economic component section size.(4). Expand the application range of the component. Because of the prestressed concrete improvement component crack resistance, and can be used for waterproof, permeability and corrosion resistance requirements of the environment; Using h
19、igh strength materials, the structure to be dexterous, rigidity, distortion, and can be used in the large span and heavy load and load under repeated the structure.Prestressed concrete has been widely applied to industrial and civil building and transportation construction. For example, 冂 prestresse
20、d concrete hollow slab shape roof board, roof, roof beam, crane beam, pre-stress Bridges, railway sleeper used in great quantities such as already. In hydraulic structure also has used to build dock, zhanqiao pier, pile, gate, DiaoDuShi, pressure conduit, circular pool, aqueduct, road, bridge, and w
21、ork the roofing beams and hydropower station workshop crane beam structure component, also can used for the method of prestressed reinforced dam, tunnel lining. For some have unique requirements of the structure, such as the need to prevent water corrosion sea platforms, resistance to high temperatu
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