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:718
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.