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采用结构优化方法设计钢框架,提高其对临界柱突然拆除而引起的连续倒塌的抵抗性能。利用美国UFC规范抗连续倒塌设计中建议的线性静力、非线性静力或非线性动力分析方法,采用构件拆除法获得结构抗连续倒塌性能。以某9层3跨规则钢框架平面模型为例,优化构件尺寸使总用钢量最小,并满足AISC抗震规范和UFC规范抗连续倒塌的要求。结果表明:无论采用哪种分析方法,最小用钢量抗震设计都不能明确考虑连续倒塌且不能满足构件拆除法的要求。采用线性静力方法进行抗连续倒塌设计最保守,效果最差。相比而言,若以UFC抗连续倒塌允许值为标准,只要模型和计算过程正确,非线性静力和动力分析能使设计更经济。
The structural optimization method is used to design the steel frame to improve its resistance to the continuous collapse caused by the sudden removal of the critical column. Based on the proposed linear static and nonlinear static or nonlinear dynamic analysis proposed in the UFC Code of UFC, the structural anti-continuous collapse performance is obtained by the component dismantling method. Taking a 9-story, three-span steel frame plane model as an example, the component size is optimized to minimize the total amount of steel used and to meet the requirements of AISC seismic code and UFC code for continuous collapse. The results show that no matter what kind of analysis method is adopted, the seismic design of the minimum steel consumption can not explicitly consider the continuous collapse and can not meet the requirements of the component dismantling method. The use of linear static method for anti-continuous collapse design the most conservative, the worst. In contrast, if the allowable UFC collapse allowance is used as standard, non-linear static and dynamic analyzes can make the design more economical as long as the model and calculation are correct.