轴压、压扭荷载作用下内嵌H型钢钢管混凝土柱的受力性能研究

Mechanical Behaviors of H-shaped Steel Encased in Concrete-filled Steel Tube Columns under Axial Loads and Torsion Loads

钢管混凝土组合构件已广泛使用于各类建筑结构中,本文在目前已有的钢管混凝土柱中内嵌H型钢,拟对其进行轴压和压扭两工况加载研究。通过对3个试件的试验,研究了其在轴压和压扭两种工况下的破坏形态和受力性能。通过变化轴压比的大小,分析了其扭矩-扭转角滞回曲线、扭矩-扭转角骨架、力学特征以及扭转刚度退化等指标,对结果和产生机理进行了深入分析。结果表明在压扭荷载作用下,耗能能力优良,并提出了在工程实际中使用这种新型结构的基本建议。

The Concrete filled steel tuber(CFST)composite members have been widely used in various building structures.In this paper,mechanical behaviors of H-shaped steel encased in the existing concrete-filled steel tube columns under axial loads and torsion loads are studied.Through the tests of three specimens,their failure modes and mechanical properties under axial compression load and compression torsion loads are in-vestigated.By changing the values of axial compression ratio,the torque-torsion angle hysteresis curve,torque-torsion angle skeleton,mechanical characteristics and torsional stiffness degradation are analyzed,and the out-comes and generation mechanism are discussed in detail.The results show that the energy dissipation capacity is excellent under compression and torsional load.Some general recommendations for this new structure engineer-ing applications are put forward.