粘钢法全长加固钢管柱极限承载力研究  

Study on ultimate load capacity of steel-tube columns strengthened by sticking steel tube

作　　者：隋炳强 邓长根[2] 罗兴隆 

机构地区：[1]上海宝冶集团钢构设计院,上海201908 [2]同济大学建筑工程系,上海200092

出　　处：《山东建筑大学学报》2011年第5期420-424,435,共6页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(50478107)

摘　　要：对卸载和受荷情况下外粘钢板加固轴压圆钢管的弹塑性受力全过程进行了研究。考虑了残余应力、初弯曲、受荷弯曲的因素,采用数值积分法计算了粘钢加固圆钢管完整的荷载—位移曲线,分析了长细比、初应力比、径厚比、加固层厚度及残余应力对压杆极限承载力的影响。研究结果表明:长细比和初应力比是影响加固钢管极限荷载的主要因素,长细比或初应力比越小,加固后极限荷载增幅就越大;随着径厚比或粘钢厚度的增大,截面抗弯刚度也相应增大,极限荷载增幅亦相应增大;残余应力的存在明显降低了加固时所能达到的极限荷载。最后提出了粘钢加固轴压杆的计算方法。This paper analyzes the whole behavior of steel tubular columns strengthened by sticking steel plates which are under various initial axial compression. The load-deflection curves of circular section struts are calculated with numerical integration technique. By taking the effects of initial stress ratio, slenderness ratio, diameter to thickness ratio, the thickness of reinforced layer and residual stres- ses into consideration, the ultimate load capacity are assessed of steel-tube columns strengthened by steel plates. Results show that slenderness ratio and initial stress ratio have a significant influence on the ultimate load capacity of steel-tube columns. The smaller the slenderness ratio or the initial stress ratio, the greater the ultimate load of columns ; the greater the thickness of reinforced layer or diameter to thickness ratio, the larger the ultimate load of columns ; also residual stress can significantly reduced the ultimate load capacity of steel-tube columns. Finally the design recommendations are presented.

关 键 词：粘钢 钢管 加固 极限承载力 

分 类 号：TU391[建筑科学—结构工程]