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何谓多次预应力钢结构?它有什么优点?

发布时间:2015-9-10 9:39:49 浏览次数:492



采用多张法引入预应力的钢结构称为多次预应力钢结构。荷载与预应力相间地施加到结构上去,即加载――张拉――再加载――再张拉――再加载,循环进行。

由于加载和卸载的方式及着力点不同,每一循环后都会在构件内产生不同的差额内力,限制下一循环的力度与效果。因此,多次预应力的张拉力度是衰减的,有益的张拉次数常不超过3次~4次。预应力钢结构学科中多次预应力理论是50多年前笔者首次提出并完成理论及模型试验研究的。
基于钢材在弹性强度范围内有限次的张拉并不影响其强度幅值的属性,多次卸载多次利用弹性强度的优势,大大提高了结构的承载力,并节约了结构用钢量,降低了结构成本,属于高效率的钢结构承载体系。

20世纪90年代,我国首建了两座多次预应力钢结构屋盖的体育馆,一座是四川攀枝花市体育馆,另一座是西昌市铁路体育中心。两者的省钢率都接近40%。目前,这两座建筑已成功服役了20年。



Using a method is introduced of the prestressed steel structure is called the prestressed steel structure for many times. Load and prestressed and applied to the structure, namely load - tensioning - loaded - tension - reload again, circulation.

Due to loading and unloading methods and focus is different, after each cycle will produce the difference between the different internal force in the member, limit the strength and the effect of the next cycle. Therefore, multiple attenuation, prestressed tension strength is beneficial tensioning number often does not exceed 3 ~ 4 times. Subject of multiple prestressed prestressed steel structure theory is more than 50 years ago, I put forward for the first time and complete theory and model test research.

Based on elastic strength steel within limited time tension does not affect the strength of amplitude attribute, many unloading much advantage of elastic strength, greatly improving the bearing capacity of the structure, and save the steel weight of the structure, lowering the cost structure belongs to the high efficiency of the steel structure bearing system.

First built in the 1990 s, China's two times of prestressed steel structure roof of the stadium, a food is a sichuan mr.zhang stadium, and the other one is xichang railway sports center. The province steel ratio is close to 40%. At present, the two buildings has successfully served for 20 years.


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