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为了研究符合实际工程边界条件下,一端偏心连接的Q460高强等边单角钢的受力性能及极限承载力,将其设计在类似输电铁塔横担的子结构中,进行破坏性静力试验。试验研究表明:一端偏心连接的高强角钢受压时发生弯扭屈曲,变形集中于偏心端,且连接肢发生明显的局部屈曲。试验构件ASCE10-1997计算值与试验值吻合较好,可以为高强角钢设计提供依据,而我国DL/T 5154-2002规范用于Q460高强角钢设计偏保守。子结构中试验角钢的变形过程和受力性能与单根试验试件基本相同,说明单根压杆试验一端采用双刀口支座,能够模拟角钢在实际结构中的端部约束条件。高强角钢一端偏心压杆的子结构试验可以为修正单根构件试验研究和理论分析提供基础试验素材。
In order to study the bearing capacity and ultimate bearing capacity of Q460 high-strength equivalent-angle single-angle steel with eccentric connection at one end, the destructive static test was carried out in a sub-structure similar to the cross arm of transmission tower under the actual engineering boundary conditions. Experimental studies have shown that bending and buckling of the high-strength angle steel with eccentric connection at one end results in buckling and deformation, with the deformation concentrated on the eccentric end and obvious flexion of the connecting limb. The calculated value of test component ASCE10-1997 is in good agreement with the test value, which can provide the basis for the design of high strength angle steel. However, China DL / T 5154-2002 specification is used for the partial conservative design of Q460 high strength angle steel. The deformation process and the force performance of the test angle steel in the substructure are basically the same as that of the single test specimen, which shows that the single-end compression test can adopt one end of the double-blade bearing to simulate the end restraint condition of the angle steel in the actual structure. The sub-structure test of eccentric bar with one end of high-strength angle steel can provide the basic test material for the experimental research and theoretical analysis of single-component modification.