蜂窝梁滞回性能研究

为了研究地震作用下蜂窝梁滞回性能、局部稳定性以及局部屈曲对蜂窝梁滞回性能的影响规律，采用试验研究与理论分析相结合的方法对蜂窝梁滞回性能进行研究。设计4根不同腹板高厚比的正六边形孔蜂窝简支梁试件，在简支梁中央施加低周往复荷载进行拟静力试验。通过试验得到不同腹板高厚比正六边形孔蜂窝梁的滞回曲线、骨架曲线、刚度退化曲线，计算相应的延性系数及耗能系数，分析其破坏过程和破坏形态，研究蜂窝梁的滞回性能和破坏机理。结果表明:腹板高厚比较大的正六边形蜂窝梁主要破坏方式为孔间腹板局部屈曲，屈曲会导致试件变形急剧增加，滞回性能迅速变差，造成试件承载力下降而破坏；腹板高厚比越大，腹板越容易发生局部屈曲变形，因此，在实际工程中蜂窝梁应该严格限制腹板高厚比。

Study on Hysteretic Behavior of Cellular Beam

In order to study the hysteretic behavior and local stability of cellular beam under earthquake, and the influence law of local buckling on hysteretic properties of cellular beam, through combining the method of experimental research, theoretical analysis to study the hysteretic behavior of cellular beam. 4 hexagon-hole cellular simple-supported beam specimens with different web height-thickness ratios were designed, the pseudo static test was carried out in the center of simple-supported beam with low cycle reciprocating load. The hysteretic curves, skeleton curves, and stiffness degradation curves of hexagon-hole cellular beams with different web height-thickness ratios were obtained, the corresponding ductility coefficient and energy dissipation factor were calculated, the failure process and failure form were analyzed, and the hysteretic behavior and failure mechanism of the cellular beam were studied. The results show that the failure mode of the hexagon-hole cellular beam with larger web height-thickness ratio is local buckling of the web between holes, buckling will lead to deformation of the specimen increasing sharply, the hysteretic behavior will deteriorate rapidly, resulting in the decrease of bearing capacity and the destruction of the specimen. As the web height thickness ratio increases, the web is more vulnerable to local buckling. Therefore, the web height-thickness ratio should be strictly restricted in practical engineering.