桿件力學(xué)模型在空間鋼結(jié)構(gòu)中的應(yīng)用研究
沈祖炎 蘇 慈 羅永峰
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沈祖炎 蘇 慈 羅永峰
（同濟(jì)大學(xué)建筑工程系 上海 200092）[提要] 介紹了目前規(guī)范校核空間鋼結(jié)構(gòu)安全所用方法存在的弊端，提出了在計(jì)算空間鋼結(jié)構(gòu)極限承載力時(shí)必須考慮單根構(gòu)件發(fā)生屈曲失穩(wěn)以后對(duì)整體結(jié)構(gòu)極限承載力的影響。針對(duì)目前桿件力學(xué)模型存在的不足，基于桿中部塑性鉸模型的思想提出了一個(gè)更加合理的力學(xué)模型。通過(guò)數(shù)值分析驗(yàn)證了該桿件力學(xué)模型的有效性，并論證了在空間鋼結(jié)構(gòu)極限承載力的理論計(jì)算中，使用不同的材料本構(gòu)和桿件力學(xué)模型將會(huì)得到明顯不同的結(jié)果。結(jié)果表明：當(dāng)采用桿件力學(xué)模型時(shí)，由于模型反映了壓桿的屈曲后性能，能夠較為準(zhǔn)確地求出空間鋼結(jié)構(gòu)的極限承載力。
[關(guān)鍵詞] 桿件力學(xué)模型 空間鋼結(jié)構(gòu) 極限承載力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
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