跨中有支撑的等边单角钢压杆承载力试验研究

Experimental Study on Bearing Capacity of Single Equal-Angle Steel Strut by Support in The Across

在输电铁塔工程中一些跨中有支撑的等边单角钢压杆被经常使用,国内《钢结构设计规范》以及《架空送电线路杆塔设计技术规定》提供了等边单角钢压杆的稳定承载力计算方法,但没有给出跨中有支撑的等边单角钢压杆的计算公式,常采用单角钢的计算公式进行计算,实际工程发现有些此类单角钢会出现过早破坏的案例.根据三种截面规格的六种长细比共计54根跨中有支撑的单角钢压杆的试验结果,得到了此类构件在不同长细比下的破坏模式以及极限承载力,结果表明:大长细比构件的失稳模式为绕平行轴失稳,极限承载力较《架空送电线路杆塔设计技术规定》(DL/T5154-2012)规范设计值低,偏于不安全;小长细比试件有时会发生局部失稳,极限承载力较《架空送电线路杆塔设计技术规定》(DL/T 5154-2012)规范值高,具有较高的安全裕度.

In the transmission tower project is often used in some of the support of the equilateral single angle bar,the current domestic steel structure specifications and the overhead transmission line tower design technical provisions provides the same side of the angle of the stability of the bearing capacity calculation method,But on the support of the cross-equilateral single-angle bar is relatively rough rules. In this paper,the ultimate bearing capacity and failure modes under different slenderness ratios are obtained according to the test results of 54 single-span steel struts with three kinds of cross-section and six cross-section specifications.The results show that： The ultimate load-carrying capacity is lower than the design value of DL/T 5154-2012,and the instability of the slender specimen is easy to occur. The ultimate load-carrying capacity（ DL/T 5154-2012）specification value is high,with high security margin.