The prevalence of steel-structure buildings serves as an indicator of a nation's or region's economic strength and level of development. Since the turn of the millennium, my country has experienced significant national economic growth and a marked increase in overall national power, becoming a global leader in steel production. This shift prompted a policy of "active and rational use of steel" in construction, effectively casting off previous restrictions on steel consumption and leading to a rise in steel-structure buildings, particularly in economically developed regions. The period around 2008, driven by the Olympic Games, saw a surge in steel-structure construction; robust market demand fueled rapid expansion, resulting in the completion of numerous steel-framed venues, airports, transport hubs, and high-rise buildings. Some of these projects-such as the National Stadium (the "Bird's Nest")-demonstrated world-class expertise in fabrication and installation.
Following the Olympics, steel-structure construction became more widespread and continued to evolve. Today, steel structures are extensively utilized across sectors including general construction, railways, bridges, and residential housing. There are now tens of thousands of steel-structure enterprises of varying scales, equipped with state-of-the-art processing machinery-such as multi-spindle/multi-axis drilling machines, multi-axis pipe-profiling cutting machines, and automated corrugated-plate welding systems. Furthermore, hundreds of these firms-notably those with top-tier (special-grade or first-grade) qualifications-operate at a world-class standard of fabrication. With an annual steel output exceeding 600 million tons, the available range of steel products fully meets the demands of the construction industry. Additionally, a comprehensive framework of standards and regulations is now in place, covering steel-structure design, materials, construction quality inspection, and various specialized technical codes and proprietary construction methods.