Eccentrically braced frames in high-rise steel structures refer to steel frames that support deviations from beam column nodes. In the mid-1970s, the University of California, Berkeley conducted experimental research, making the eccentrically braced frame system a mature seismic resistant structure in the United States..
The eccentrically braced frame of high-rise steel structures is a very rigid structural system with excellent energy dissipation capacity to resist the influence of larger earthquakes..
Eccentrically braced frames have relatively smaller lateral displacement and more uniform inter story distribution than center braced frames and ordinary flexural frames. The flexural frame has good ductility and energy dissipation capacity, but the structure is relatively flexible and has poor elastic stiffness. In order to control the elastic interlayer displacement, beam and column cross-sections that exceed the bearing requirements can be used. The use of central support frame has high stiffness in the elastic stage, but low ductility and energy dissipation capacity. After the support is compressed and buckled, it is easy to cause the high-rise steel structure to lose its bearing capacity and fail..
Due to the effective deformation control ability of eccentrically braced frames, they are approximately 25% to 30% lighter than bending frames and 18% to 20% lighter than center braced frames. Using eccentrically braced frames can save steel..
