Conversely, there has been limited investigation of the seismic response of multi-panel CBFs and several concerns have been raised by the engineering community regarding their seismic performance:


Tall single-storey steel buildings are commonly used in North America for industrial buildings, airplane hangars or warehouse buildings. For the lateral load resisting system for such tall structures, design engineers often use vertical braced frames with two or more bracing tiers or panels stacked between the ground and roof levels (Fig. 1a). With this configuration, brace length is reduced, which leads to smaller brace sizes as shorter braces are more effective in compression.