基于某中心支撑钢框架的中美标准对比研究

Comparative Research of Chinese and American Standards Based on a Centrally Support Steel Frame

通过建立某典型中心支撑钢框架结构,考虑中美标准在材料及荷载等方面差异,以构件验算比为指标,梳理两种设计标准在该钢框架算例中的区别。结果表明,美标A36等级钢材屈服强度略高于国标Q235等级钢材;中美标准中地震作用参数取值在抗震设防目标理念上存在较大差异;风荷载区别主要在于基本风速测定时距和重现期不同;在风险等级基本一致的情况下,同一结构在国标下的构件验算比较低。

By establishing a typical centrally support steel frame structure,considering the differences in materials and loads between Chinese and American standards,the difference between the two design standards in the steel frame example is sorted out with the component checking ratio as the index.The results show that the yield strength of A36 grade steel is slightly higher than that of Q235 grade steel.There are great differences in the concept of seismic fortification target between Chinese and American standard seismic action parameters.The difference of wind load is mainly due to the different time interval and return period of basic wind speed measurement.In the case of basically the same risk level,the component checking ratio of the same structure under the Chinese standard is relatively low.