高强单角钢一端偏心压杆极限承载力试验研究

为了研究输电塔中Q460高强角钢一端偏心压杆受力性能，通过试验与理论计算方法分析了受压试件的整体稳定和局部屈曲情况，试件轴心端采用球铰和双刀口支座模拟，考察了不同端部条件和残余应力等对角钢受力性能的影响，结果表明：试件轴心端无论采用球铰支座或双刀口支座形式，均能较准确反映角钢构件的受力性能，残余应力对试件承载力影响小于5％。比较了试验、有限元法、美国《输电铁塔设计导则》（ASCE10—1997）和中国《架空送电线路杆塔结构设计技术规定》（DL／T5154—2002）对角钢极限承载力值的不同处理方法，指出采用DL／T5154—2002标准计算方法对高强钢杆件承载力得出的结果偏保守，在此基础上，提出了对实际材料强度除以抗力分项系数rR=1．111后改造的ASCE设计方法。

Ultimate Bearing Capacity Analysis of High-Strength Single-Angle Compression Member Eccentrically at One End

To analyze mechanical behavior of Q460 high-strength single-angle steel struts with an eccentric load at one end in transmission towers, experimental analysis and theoretical calculation were carried out to study the overall stability and local buckling of members. Spherical hinge bearing and double knife-edge bearing were applied at axial end of specimens. Influence of some factors on bearing capacity of compression members with eccentricities at both ends was analyzed, such as the end supporting conditions and residual stresses. It was shown that whether spherical hinge bearing or double knife-edge bearing was used at axial end, the mechanical behavior can be accurately presented and the residual stresses affected the ultimate load-carrying capacity by about 5 ~ or less. Compared with different methods, such as experiment method, finite element method, method in the Guide for American Design of Latticed Steel Transmission Structure (ASCE10-1997)and method in Chinese Technical Regulation of Design for Tower and Pole Structure of Overhead Transmission Line (DL/TS154-2002), it was found that the calculated strength of high strength steel member by standard calculation method in DL/T5154- 2000 was over-conservative.According to the research results, the revised formulas of ASCE were proposed with dividing actual material strength by the resistance coefficient of rR=1. 111. Therefore, the experimental results can provide reference for designing high-strength Q460 single-angle steel members compressed eccentrically at one end.