冷弯矩形钢管柱抗震性能应用研究.pdf

北京工业大学硕士学位论文冷弯矩形钢管柱抗震性能研究姓名:郭士江申请学位级别:硕士专业:防灾减灾工程及防护工程指导教师:李振宝 20070501 摘要捅要建筑结构用冷弯矩形钢管是采用冷轧或热轧钢带,经连续辊式冷弯及高频直缝焊接生产形成的矩形钢管。冷弯矩形钢管是我国近年来发展的一种结构用钢,在建筑、桥梁等领域有着十分广泛的应用阿景。冷弯矩形钢管虽然可以实现大批量工厂化生产,但冷弯矩形钢管在冷成型过程提高了材料的屈服点和抗拉强度同时降低了延性,因而冷弯矩形钢管作为柱材在建筑结构抗震中的应用有待进一步研究。本文对冷弯矩形钢管轴压状态下的力学性能作了分析,提出了厚壁冷弯型钢屈服强度计算的修正公式;同时对受常轴力、侧向循环荷载作用下的力学性能进行了计算分析,并对其破坏机理做了重要阐述。在对翼缘宽厚比、腹板高厚比和轴压比等影响下冷弯矩形钢管压弯构件滞回性能的主要因素进行系统分析的基础上,得出了抗震设计时翼缘宽厚比、腹板高厚比、轴压比的限值要求, 及其应用于塑性设计时塑性发展系数的修正值,并给出了极限位移角的限制要求,供规范和设计参考。本文比较系统、全面地研究了冷弯矩形钢管在轴压或压弯条件下的力学性能,特别是抗震性能,提出的结论对修订规范和指导工程设计有重要的参考价值,为今后冷弯矩形钢管在抗震方面的研究打下了一定的基础。关键词:冷弯矩形钢管;柱;抗震性能;有限元分析北京I业人学1宁硕},学何论文 ABSTRACT Cold—forilledrectangular tube-steel column forarchitecture structure is formed by rollcold·winding forming process and HF longitudinal seam —formed rectangular tube—steelcolumn have been developed in recent years and itwillbe wildly used inmany engineering areas such asbuilding,bridge and cold·rformedrectangular tube·,steelcolumn isfavorable toindustrialization ofmass production,the coldforming process increase theyieldpoint and tensilestrength,at the same time the coldforming process decrease the ductile behavior,SO necessary toresearch the seismic behavior ofcold—formed rectangular tube·steel column forarchitecture structure. This paper performs acalculation on thebehaviors ofcold—formed rectangular tube-steel columns subjected toconstant axialforceand anew formulas hasbeen taken forcalculating yieldstrength ofcold—formed steelmembers based on FEM. Then thepaper performs aparametric calculation on thebehaviors ofcold-formed rectangular tube-steel columns subjected tO constant axialforceand cyclic bending major factors influencing thehysteretic characteristic ofcold—formed rectangular tube·steelcolumns,such asthewidth·tO—thickness ratioofflange,the depth-tO-thickness ratioofweb and theaxial force are analyzed indetail,The interrelation requirement tO be fulfilledinseismic design on these factors are derived,and the relationship betwe