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为研究盖板加强型节点钢框架结构的抗震性能,通过3榀1∶3缩尺盖板加强型节点钢框架子结构的低周往复加载试验,分析了此类子结构的滞回性能、刚度、延性、等效黏滞阻尼比,以及此类钢框架子结构侧向倒塌时的层间位移角、层间累积延性及累积耗能系数。研究表明:薄壁钢梁钢框架子结构试件的钢梁端部先屈曲后屈服,对应的层间最大位移角均值为3.5%,层间累积塑性位移角为45.5%,层间累积位移角延性比为43.3,层间累积塑性耗能系数为33.05;厚壁钢梁钢框架子结构试件在钢梁端部进入塑性后,其梁柱连接区域的焊缝断裂,对应的层间最大位移角均值为6.2%,层间累积塑性位移角为85.6%,层间累积位移角延性比为61.2,层间累积塑性耗能系数为72.66;厚壁钢梁钢框架子结构试件的钢梁端部形成理想塑性铰,对应的层间最大位移角可达7.2%,层间累积位移角为162.9%,层间累积位移角延性比为139.3,层间累积塑性耗能系数为117.58。
In order to study the seismic behavior of the steel frame structure with stiffened node, the hysteretic behavior of the stiffened node steel frame substructure with 3 榀 1: 3 scale was analyzed. The hysteretic behavior, stiffness , Ductility and equivalent viscous damping ratio, as well as the inter-story drift angle, the cumulative ductility between layers and the cumulative energy dissipation coefficient of such steel frame substructure during lateral collapse. The results show that the end of the steel beam of the steel frame substructure specimen of the thin-walled steel beam is buckled first and then buckled, the corresponding maximum displacement angle between layers is 3.5%, the cumulative plastic displacement angle between layers is 45.5%, and the cumulative displacement ductility ratio Is 43.3, and the accumulative plastic coefficient of energy dissipation between layers is 33.05. After the specimens of steel frame sub-structure of thick-walled steel girder enter into the plasticity at the end of the steel beam, the welding seam of the beam-column connecting area is broken and the corresponding average maximum displacement angle between layers Is 6.2%, the accumulative plastic displacement angle between layers is 85.6%, the accumulative displacement angle ductility ratio between layers is 61.2, and the cumulative plastic dissipation coefficient between layers is 72.66. The ends of the steel beams of the steel frame sub-structure specimens of thick- The ideal plastic hinges have a maximum displacement angle of 7.2%, an accumulated displacement angle of 162.9%, an accumulative displacement angle of 139.3 and a cumulative plastic dissipation factor of 117.58.