钢管混凝土核心短柱轴压载荷-变形非线性分析.pdfVIP

辽宁工程技术大学学报(自然科学版) 第 29 卷第 2 期 2010 年4 月 协1.29 No.2 Joumal of Liaoning Technical University (Natural Science) Apr. 2010 文章编号: 1 ∞8-0562(2010)02-0224-04 钢管混凝土核心短柱轴压载荷.变形非线性分析 刘洁，王正中 (西北农林科技大学水工程安全与病害防治研究中心，陕西杨凌 712100) 摘 要:为了对铜管混凝土核心短柱载荷.变形关系进行非钱性分析，假定三向应力下混凝土服从伽:osen 破坏准 则和本构关系，基于广义虎克定律和形变理论建立了多向应力状态下钢材的应力·应变关系，依据静力平衡和变 形协调条件，推求了该柱载荷.变形分析力学模型:据此编写程序对其载荷·变形全过程进行非线性数值模拟，并 从中得到该柱极限承载力，结果表明全过程模拟曲线与试验曲线基本一致，理论极限承载力比试验结果偏小5%; 可见该力学模型既符合该柱受力变形的过程和机理，又是偏安全的，能较好地应用于铜管混凝土核心柱载荷.变 形分析及承载力计算. 关键i司z 钢管混凝土z 核心柱:臼ωsen 破坏准则:载荷.变形=非线性分析 中固分类号: TU398 文献标识码:A A non-linear analysis on axialloading-deformation of composite short columns with core of concrete filled steel tube LIUJ岭， WANG Zhengzhong (Research Center ofWater Engineering Safety and Disaster Prevention ,Northwest Sci-tech Univenity of Agricul饥lre and Forestry,Yangling 712100,China) Abstract: Based on force equilibrium and deformation compatibili纱， and 也e assumption on concrete stress-s田h relationship in 位iaxial states following 由e Ottosens failure criterion, the steel s住ess-strain relationship in biaxial s仕ess state was modeled with the generalized Hookes law and total theory of pl臼ticity. A dynamic model for calcu1ating axial loading-deformation of composite columns with ∞re of concrete filled steel tube w臼 derived. 咀le dynamic model was used to simulate 由e N/Nu vers田S回in complete c町ve and the axial bearing capacity of the columns. Compared with experimental results，也e theoretical results were 岛und to be in good agreement wi也 test resu1ts，也e simulating c田ves approaching to 也e exp臼imental ones.ηle resu1ts of calculated bearing capacity were approximately 5% lower than the experimental ones. 咀le d