蒙古国Eco Tower钢结构中美规范设计对比分析

Comparison between Chinese and American code for design of Mongolia Eco Tower steel structure

针对蒙古国Eco Tower钢结构高层项目的实际设计条件,选用两个相同的钢框架-支撑结构模型,分别采用中国规范与美国规范规定的材料特性、活荷载、风荷载、地震荷载及相关参数进行设计,并对两个模型的动力特性、层间位移角、刚度比、二阶效应系数、构件内力、应力比及相关控制指标等计算结果进行对比分析。分析结果表明:两国规范都是恒荷载、活荷载、风荷载控制设计,结构整体指标及构件设计结果均比较接近,结构安全度基本相当。其中中国规范的层间侧移角、二阶效应系数等要求比美国规范略严。此外,活荷载美国规范偏大,而地震工况、风工况及组合工况内力、构件设计应力中国规范偏大。本项目如按美国规范进行设计,经济性略优于中国规范;而按中国规范进行设计,安全度略大于美国规范。

In view of the actual design conditions of the high-rise steel structure project of Mongolian Eco Tower,two identical steel frame-bracing structure models were selected,and the material properties,live load,wind load,seismic load and related parameters stipulated by Chinese and American code were used respectively to carry on a design.The results of dynamic characteristic,layer displacement angle,the stiffness ratio,the second-order effect coefficient,the internal force and stress ratio of component,and relevant control indicator for the two models were compared and analyzed.The analysis results show that design are both controlled by dead loads,live and wind loads for Chinese and American Codes,the overall indicators of structure and design results of component are both relatively close,and the structural safety is basically the same.Chinese codes are slightly more stringent requirement on the layer displacement angle and second-order effect coefficient than American codes.In addition,the live load of American codes is larger,the wind and earthquake conditions,internal force for combined conditions,and design stress ratios of component of Chinese codes are larger.The economy is slightly better than Chinese codes if designed by American codes for this project,and the security is slightly higher than that of American codes if designed by Chinese codes.