圆钢管空间滞回性能试验

为考察圆钢管空间滞回性能、获得考虑损伤累积的材料本构模型,设计并开展了圆钢管空间滞回试验.试验加载装置可用于空间三向加载.考虑构件长细比及不同空间加载方案的情况,确定了不同截面及长度的30根试件,加载方案为5种.通过试验方案优化,实现了圆钢管空间加载的模拟,并获得了这些试件的荷载位移滞回曲线及典型部位的应变曲线.试验结果表明:圆钢管具有良好的滞回性能,在很大的位移作用情况下,仍能保持良好的耗能能力.为后续开展符合圆钢管截面钢材的本构模型研究奠定基础.

Spatial hysteretic experiment for circular steel pipe

An experiment about circular steel pipes subjected to cyclic loading was designed to study the spatial hysteretic behavior and obtain the constitutive model of steel considering damage cumulation.The experimental device was applicable for three-dimensional loading.Five loading modes were performed on a total of 30 specimens with different cross sections and heights with consideration of different slenderness ratios and loading modes for the circular steel pipe.The spatial loading of the circular steel pipe was successfully simulated by optimizing the experimental device,and the hysteretic curves composed of loading and displacement as well as the strain curves of typical position were obtained.Results show that the experimental device can meet the need of the experimental accuracy for its good stability.The circular steel pipe has excellent hysteretic behavior and can keep good capability of energy consumption even at great displacement action.The study lays the foundation of the subsequent research on constitutive model about steel.