摘要
为了研究国家电网输电塔中Q690高强度圆钢管的压弯承载力,并考虑局部几何缺陷和初始残余应力的影响,采用有限元软件ABAQUS对长细比和径厚比变化的3根试验试件进行有限元模拟分析。结果表明,初始残余应力对长细比较大且发生整体失稳的试件存在一定的影响,而局部几何缺陷基本无影响;同时由参数分析可知,试件的压弯承载力随长细比减小而提高,且随着长细比的减小和径厚比的增大,试件的破坏模式由整体失稳过渡到局部失稳;也验证了中国现行《钢结构设计规范》中压弯构件强度与整体稳定设计公式和《架空送电线路杆塔结构设计技术规程》中压弯构件局部稳定设计公式用于指导Q690高强钢管压弯构件工程设计的可行性。
In order to study the bending performance of Q690 high performance steel tubular in power transfer tower and consider the initial local geometrical imperfection and residual stress, the finite element analysis software-ABAQUS is used to build the model of 3 test specimens. Results show that the initial residual stress definitely affects the specimens of global instability, while the effect of initial local geometrical imperfection is not significant; at the same time, from the extensive parametric study, we can see that the bending capacity improves with the decrease of the slenderness ratio, and the failure mode of the specimens transfers from the overall to local instability with the decrease of slenderness ratio and the increase of diameter to thickness ratio. A series of formulas including bending members＇ strength and overall stability design formula in Specification for Steel Structure and their local stability design formula in Technical Regulation of Design for Tower and Pole Structures of Overhead Transmission Line are also verified to be feasible and reasonable in guiding the engineering design of bending members of Q690 high performance steel tubular.
出处
《苏州科技学院学报（工程技术版）》
CAS
2013年第4期22-27,共6页
Journal of Suzhou University of Science and Technology （Engineering and Technology）
基金
国家电网公司应用科研项目(2011-08)
