Steel structure projects are not simple "steel accumulation", and their characteristics deeply affect the management logic of the project manager: Uniqueness: Each project is a "customized version", the woven grid of the Bird's Nest and the free-surface roof of Daxing Airport are required to abandon "empiricalism" and customize management plans for project characteristics. One-time: The project cannot be copied, and every link from construction to completion cannot be repeated. A stadium project was delayed by 20 days due to a mistake in the lifting plan, and the direct loss exceeded 8 million yuan, confirming the cruel reality of "no matter how careless you lose everything". Integrity: Steel columns, steel beams, and node plates are linked together. Demolition of any support may trigger a chain reaction. The project manager needs to establish a systematic thinking and coordinate the coordinated operations of structure, electromechanical, and decoration. Fixability: The project location is not movable, and geological conditions need to be investigated in advance (such as coastal projects require corrosion protection design) and transportation routes (traffic of extra-long components requires application for road access permit). Uncertainty: variables such as steel price fluctuations (annual fluctuations can reach ±20%), extreme weather (the typhoon causes stagnation of high altitude operations), require project managers to have risk prediction capabilities. 

Irreversibility: Once key processes such as welding and pouring are completed, the rework cost will increase exponentially. Due to the positioning deviation of steel beams of a high-rise project, the rectification cost is as high as 15% of the original cost.