椭圆形钢管混凝土构件纯弯力学性能分析  

MECHANICAL BEHAVIOURS OF ELLIPTICAL CONCRETE-FILLED STEEL TUBULAR MEMBERS UNDER PURE BENDING

作　　者：任庆新[1] 方达[1] 赵雄 蒋治国 

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168 [2]中建五局(辽宁)建设有限公司,沈阳110004

出　　处：《工业建筑》2014年第4期12-15,77,共5页Industrial Construction

基　　金：国家自然科学基金项目(51208135);辽宁省质量技术监督局资助项目(2012DB155B);沈阳市城乡建设委员会资助项目

摘　　要：利用有限元软件ABAQUS建立椭圆形钢管混凝土构件纯弯力学性能分析的有限元计算模型,并通过6个椭圆形钢管混凝土构件纯弯试验验证有限元计算模型的准确性。在此基础上对其受力全过程中钢管及混凝土应力分布情况进行分析,同时给出钢管与核心混凝土之间的相互作用,并对剪跨比、钢管强度、混凝土强度、短轴长和长轴长等参数对纯弯时构件极限承载力及荷载-位移曲线的影响进行比较。结果表明:椭圆形钢管混凝土构件在跨中发生倾向弯曲破坏,钢管屈服强度、混凝土强度、长轴长、短轴长及钢管壁厚等参数对其力学性能影响显著,剪跨比对其力学性能影响不明显。A finite element analysis （ FEA ） model for elliptical concrete-filled steel tubular member under pure bending is developed by the universal FEA software ABAQUS .The corresponding tests of 6 members under pure bending are conducted to verify the FEA model .It can be found that, in general, good agreement is obtained between the predicted and test results .The FEA model is then used to investigate the mechanism of such composite members further.The stress distribution of the steel tube and the concrete , and the interaction between the steel tube and the core concrete are analyzed .And then, the main parameters influencing the ultimate bearing capacity and the loaddeformation relationship curves under pure bending such as shear span ratio , steel tube strength , concrete strength , major axis length and minor axis length are investigated .The results show the typical failure modes of these members were the lateral overall bending at about mid-length, the yield strength of steel tube , the compressive strength of concrete , the major axis length , the minor axis length and the steel tube wall thickness have obvious effects on their mechanical behavior , while the shear span ratio has slight effect on their mechanical behavior .

关 键 词：钢管混凝土 椭圆形截面 纯弯 力学性能 有限元分析 

分 类 号：TU398.9[建筑科学—结构工程]