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为了研究三肢圆钢管格构柱的抗震性能,进行了两个试件在低周反复荷载作用下力学性能的试验研究,考察了肢件钢管壁厚度对低周反复荷载作用下三肢圆钢管格构柱破坏形态、荷载-位移曲线、荷载-应变曲线、刚度退化、耗能能力和延性的影响。结果表明,试件肢件的钢管壁越厚,其水平承载力、初始刚度、累积耗能和位移延性系数越大,同时刚度退化越慢。最后,通过《钢结构设计规范》(GB 50017—2003)计算得到的三肢圆钢管格构压弯构件承载力与试验结果的比较,探讨了反复荷载作用下三肢圆钢管格构柱承载力的计算方法。研究成果可为有关工程实践提供参考。
In order to study the seismic behavior of the three-legged circular steel tubular columns, the mechanical properties of the two specimens under low cyclic loading were investigated. The effects of the thickness of the limbs on the mechanical properties of the three limbs under cyclic loading Effect of failure morphology, load - displacement curve, load - strain curve, stiffness degeneration, energy dissipation capacity and ductility of lattice. The results show that the thicker the steel wall of the test piece, the greater its horizontal bearing capacity, initial stiffness, cumulative energy dissipation and displacement ductility coefficient, and the slower the stiffness degradation. Finally, through the comparison of the bearing capacity of three-limbed circular steel tube column (CFST) columns calculated by the Code for Design of Steel Structures (GB 50017-2003) and the test results, the bearing capacity of the three-legged CFST columns subjected to repeated loading The calculation method. The research results can provide reference for engineering practice.