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Comparison of Chinese and American Design Codes for Steel Frame-Braced Tube Structures
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摘要: 为研究中美规范在钢框架-支撑筒结构设计上的差异，以北京某160.8 m的钢框架-支撑筒结构实际工程为例，分别按中美规范及相应设计习惯进行结构设计，并比较了中美规范设计模型间结构整体指标、材料用量、抗地震倒塌性能等方面的差异。结果表明：在相同的计算参数下，中美规范设计模型间结构刚度和结构整体指标相对接近；中美规范关于钢框架-支撑筒结构抗震二道防线设计的内力调整和实现方法均有较大差异，导致构件截面设计存在差异；中美规范设计模型间材料用量的分布不同，按中国规范设计模型的梁和支撑材料用量较多、柱材料用量较少，总体材料用量高4%；中国规范设计模型的抗倒塌安全储备系数约低于美国规范设计模型的7.5%。Abstract: To study the differences between Chinese and American codes in the design of steel frame-braced tube structures， a practical engineering project—a 160.8 m steel frame-braced tube structure in Beijing—was taken as an example. The structural design was carried out according to Chinese and American codes and their corresponding design habits. The differences in overall structural indicators， material consumption， and seismic collapse resistance performance were then compared between the models designed under the two codes. The results showed that， under the same calculation parameters， the structural stiffness and overall structural indicators of the models designed according to Chinese and American codes， respectively， were relatively close. There were significant differences in the internal force adjustment and implementation methods for the seismic second line of defense design of steel frame-braced tube structures between China and the United States， resulting in differences in component section design. Additionally， the distribution of material usage between the models designed by Chinese and American codes differed. In the model designed according to the Chinese code， the beam and brace material usage was higher， while the column material usage was lower， with the overall material usage being 4% higher. Furthermore， the collapse margin ratio of the model designed by the Chinese code was approximately 7.5% lower than that of the model designed by the American code.
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