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预应力钢结构的预应力的施加方案有几种?

发布时间:2015-9-10 9:36:39 浏览次数:689




预应力引入后是长期作用在结构体系中的永久荷载。施加预应力的时机及力度要根据结构的类型,内力峰值出现情况,荷载性质及可分性以及施工工艺和条件来确定。一般有3种方法。

1.是中张法。结构安装就位后,先承受部分荷载(包括自重荷载),再施加预应力以抵消部分荷载应力后,继续承受外部荷载。这是工程中常用的施加预应力的方法,也就是单次预应力法。
2.是多张法。在结构中多次地引入预应力,加载与施加预应力间隔进行,可以多次利用材料的弹性强度幅值,较大地提高结构承载力,具有高效利用材料的特点。在预应力工艺中称为多次预应力法。但荷载必须是可分的,可分批施加在结构上。

3.是先张法。在承受外载前,结构中已引入与荷载应力符号相反的预应力。例如,商品预应力钢构件,在工厂加工制造过程中就已施加过预应力,在构件中产生了有利的卸载应力场。


Prestressed after introducing is long-term effects in the structural system of the permanent load. Prestressing of timing and strength according to the type of structure, the appearance, the internal force peak load property and separability and to determine the construction technology and conditions. There are three general methods.

1. Is the law. Structures in place after the first part under load (including the weight of the load), again after prestressing to offset part of the load stress, continue to bear the external load. This is commonly used in engineering for prestressing method, which is a single prestressed method.

2. Is more than one method. Prestressed, introduced many times in the structure, load and prestress intervals, can be repeatedly used the elastic strength amplitude, significantly improve the bearing capacity of structure, has the characteristics of efficient use of materials. In the prestressed technology called prestressing method for many times. But the load must be divisible, but partial imposed on the structure.

3. Is the first method. Before under external load, the structure has been introduced with the load stress symbol instead of prestressed. Commodity prestressed steel members, for example, in the process of processing and manufacturing in the factory has been applying prestress, produced a favorable unloading stress field in the component.



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