薄板混凝土组合截面部分外包组合柱(弱轴)滞回性能足尺试验研究

为了研究薄板混凝土组合截面部分外包组合柱（弱轴）的滞回性能，对3个薄板混凝土组合截面部分外包组合柱（弱轴）足尺试件在恒定轴压下进行了水平低周反复荷载试验，观察了加载过程中薄壁板件翼缘局部屈曲和混凝土裂缝开展与压溃现象，得到了试件的荷载 位移滞回曲线。根据试验结果分析了试件的承载力、抗侧刚度、延性与耗能、破坏模式等力学性能。结果表明：试件具有较好的变形能力和耗能能力；试件的破坏模式为柱脚部位混凝土压溃和拉结筋屈服甚至拉断，随之薄壁板件翼缘发生局部屈曲。研究进一步丰富了薄板混凝土组合截面部分外包组合柱研究成果，为该类柱设计规范的制订和工程应用提供了理论依据和技术储备。

Hysteretic behavior of full scale partially encased composite columns（weak axis） fabricated with thin-walled built-up section

In order to study the hysteretic behavior of partially encased composite(PEC) columns fabricated with thin-walled built-up section,three full-scale specimens were designed based on previous research results in the field of PEC column,which represented the middle-story column in the frame structure.The tests of the specimens were conducted under constant axial compression and lateral cyclic loading about the column weak axis.The local buckling of the flange of the thin-walled built-up section,the crack development and crushing of concrete were investigated.The hysteretic loops were obtained.Based on the test results,the specimens’ performance were analyzed,including the load-carrying capacity,lateral stiffness,seismic ductility,energy-dissipation capacity and failure mode.The research shows that the specimens exhibit good deformation and energy-dissipation capacities;the failure is primarily induced by the crushing and spalling of concrete and the yield of transverse links with the local buckling in flange of thin-walled built-up section at the corner region of column.The study provides experimental basis for revising the specification and engineering practice of the structure comprised of PEC columns.