- 摘 要
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（天津大學建筑工程學院， 天津 300072）
［摘要］在分析L形方鋼管混凝土組合異形柱特點的基礎上，通過理論計算、有限元分析得到了異形柱的破壞形態(tài)及軸壓極限承載力，并采用疊加理論推導了其換算長細比的計算公式。軸壓試驗得到了計算模型的荷載-位移曲線，單肢撓度曲線以及單肢荷載-應變曲線。分析結果可知，疊加理論計算、有限元分析以及軸壓試驗的結果一致表明，異形柱的破壞形態(tài)為彎扭屈曲，同時三種方法得到的軸壓極限荷載吻合較好，驗證了采用疊加理論計算異形柱承載力的可行性。
［關鍵詞］L形組合柱;方鋼管混凝土;疊加理論;穩(wěn)定性;軸壓試驗
Research on axial compression stability of L-shaped column composed of concrete-filled square steel tubes
Chen Zhihua, Rong Bin(School of Civil Engineering, Tianjin University, Tianjin 300072，China)
Abstract:Based on characteristics of L-shaped column composed of concrete-filled square steel tubes, research on calculation method and mechanical property for the special-shaped column is done by three methods: superposition theory, finite element analysis and axial compression experiment. The failure mode and ultimate bearing capacity under axial compression are achieved by theoretical calculation and finite element analysis. And the formula for conversion slenderness ratio is derived by superposition theory. By axial compression experiment, the curves of loading-displacement for the whole member, the curves of deflection and loading-strain for mono column are got. The results all show that the column has a flexural-torsional buckling failure mode. Also the ultimate loads under axial compression attained by the three methods accord with each other well, and the feasibility of calculating the bearing capacity of the special-shaped column by superposition theory is proved.
Keywords:L-shaped composite column; concrete-filled square steel tubes; superposition theory; stability; axial compression
基金項目：建設部科學技術項目(02-2-5-6)；天津市建設系統(tǒng)科學技術發(fā)展資助項目（200429）；新世紀優(yōu)秀人才支持計劃(2006)。
作者簡介：陳志華，教授，博導，Email:zhchen@tju.edu.cn。
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