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预应力钢结构具有众多优点,源于什么机理?

发布时间:2015-9-9 9:25:28 浏览次数:608
预应力钢结构与普通钢结构相比,具有承载力高、稳定性好、刚度大、用材省等优点。这些特征来源于其人为的工作机制,具体表现在5个方面。
1.是力的优选。可以选用全拉索的优秀结构体系,赋予预应力后,结构具有足够刚度的几何不变体系,高效承受荷载。
2.是力的重复。在构件弹性强度幅值内,可以反复受力,多次地利用材料强度潜能,提高构件承载能力。
3.是力的抵消。构件内荷载应力可以被与之反向的预应力部分抵消,因而降低应力峰值,提高构件承载力。
4.是力的质变。借助预应力体系可将构件内不利的弯矩力转换为有利的轴向拉力和压力,因此节省用料。

5.是力的转移。构件内荷载应力可以通过施加预应力而转移到高强钢索或其他高承载力的部件上去,从而降低设计应力值。


Compared with ordinary steel structure, prestressed steel structure with high bearing capacity, good stability, large stiffness, material, etc. The working mechanism of these features from its artificial embodied in five aspects.

1. Is preferred. Can choose excellent structural system of the lasso, given after prestressed structure has enough stiffness of geometric invariant system, efficient under load.

2. Is the repeated force. Within the amplitude component elastic strength, can be repeated stress, multiple use of material strength potential, improve the bearing capacity of the components.

3. Is the offset force. Components in the load stress can be inverted with prestressed partially offset, thus reducing the peak stress, improve the capacity.

4. Is the qualitative change force. Using prestressed system components can be in negative bending force is converted into a favorable axial tension and pressure, thus saving materials.

5. Is the force transfer. Components in the load stress can transfer by prestressing to the bearing capacity of high strength wire or other parts, thereby reducing design stress value.



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