Abstract

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Author(s):: JIA Lian-guang; LI Qiu-rong; LIU Meng; SONG Zhong-qi; School of Civil Engineering, Shenyang Jianzhu University

Keywords:: cellular beam; web height-thickness ratio; hysteretic behavior; local buckling; experimental study

Abstract:: 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.