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:553
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.