杆件力学模型在空间钢结构中的应用研究
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沈祖炎 苏 慈 罗永峰
（同济大学建筑工程系 上海 200092）[提要] 介绍了目前规范校核空间钢结构安全所用方法存在的弊端，提出了在计算空间钢结构极限承载力时必须考虑单根构件发生屈曲失稳以后对整体结构极限承载力的影响。针对目前杆件力学模型存在的不足，基于杆中部塑性铰模型的思想提出了一个更加合理的力学模型。通过数值分析验证了该杆件力学模型的有效性，并论证了在空间钢结构极限承载力的理论计算中，使用不同的材料本构和杆件力学模型将会得到明显不同的结果。结果表明：当采用杆件力学模型时，由于模型反映了压杆的屈曲后性能，能够较为准确地求出空间钢结构的极限承载力。
[关键词] 杆件力学模型 空间钢结构 极限承载力Application of Strut Model on Steel Spatial StructureShen Zuyan, Su Ci, Luo Yongfeng(Department of Building Engineering, Tongji University, Shanhai 200092, China)Abstract: The disadvantages of the method used to ensure the safety of steel spatial structure in the current structure code are introduced. When calculating the limited capacity of steel satial structure, it is necessary to consider the effect of local bucklingof single member on the whole structure. In order to improve the inadequacy of the current strut model, a more reasonable model is applied based on the mid-strut plastic hinge theory. The proposed model is verified by numerical analysis, and it is discussed the calculations of limited capacity of spatial structure, different material curves. It is concluded that when strut model is applied, the limited capacity of space spatial structure gets more precise results because the post bulking effects of pressed struts can be calculated in the model.
Keywords: strut model; steel satial structure; limited capacity
