支撑材料超强对弱剪型支撑钢框架影响的研究——兼论抗震钢在弱剪型支撑钢框架支撑构件中的应用

Research About Influence of Bracing Material Overstrength on Weak Shear Type Braced Steel Frames——With Reference to Application of Seismic Steel in Bracing Members of Weak Shear Type Braced Steel Frames

弱剪型中心支撑钢框架中支撑构件作为抗震的第一道防线,起着"保险丝"的作用,在较强烈地震作用下首先进入塑性状态以消耗地震能,并降低结构刚度以减小地震反应,从而保护结构主体。但支撑钢材可能存在超强现象,妨碍设计意图的实现,从而使结构主体遭受较大的地震作用。文章通过具体算例探讨了这种可能发生的现象,并且建议采用抗震钢制作钢支撑构件,以确实保证支撑构件成为第一道防线,保证主体结构的安全。

As the fwst line of seismic defence,concentrical braces in weak shear type develop plastic state to dissipate seismic energy and decrease the seismic reactions so that the main steel frame can be protected when strong earthquake occurs. But because the overstrength of steel material exists the design intention perhaps can not be implemented. The paper discusses the phenomena and suggests that seismic steel can be used to solve the problem.