装配式轻钢框架–钢丝网架珍珠岩复合墙板结构振动台试验

Shaking Table Experiment of Prefabricated Lightweight Steel Composite Frames–Perlite Insulation Reinforced with Steel Wire Mesh Composite Wall Structure

为发展高效抗震、绿色节能、施工便捷的装配式村镇住宅建筑,提出了一种适于村镇低层住宅的低能耗装配式轻钢框架–钢丝网架珍珠岩复合墙板结构,轻钢框架由方钢管混凝土柱、H型钢梁、双L形带斜向加劲肋梁柱节点及预制混凝土楼板构成,钢丝网架珍珠岩复合墙板由钢丝网砂浆内外叶复合珍珠岩板夹心聚苯板构成,钢丝网架珍珠岩复合墙板单元包裹咬合轻钢框架,墙板单元间采用企口连接。进行了两层轻钢框架–钢丝网架珍珠岩复合墙板足尺结构的振动台试验,激振包括白噪声在内的57个工况,各工况的地震动峰值加速度PGA在0.07g~1.50g,分析结构的破坏过程、刚度退化、位移、应变等动力响应。结果表明:轻钢框架与钢丝网架珍珠岩复合墙板共同工作性能良好,钢丝网架珍珠岩复合墙板对结构刚度有显著的贡献;随地震峰值加速度的增大,结构自振频率降低,阻尼比增大;在8度设防地震作用下结构最大层间位移角为1/361,基本处于弹性状态;8度罕遇地震作用下,结构没有明显的破坏;在极罕遇地震作用下,外墙板损伤明显,轻钢框架损伤较轻;钢丝网架珍珠岩复合墙板与轻钢框架包裹咬合式柔性连接,具有滑移摩擦消能减震的作用。该结构体系在村镇低层住宅建筑中有广阔的应用前景。

A prefabricated lightweight steel composite frames–perlite insulation reinforced with steel wire mesh composite wall(PSW) structure suitable for low-rise buildings in villages was proposed. The lightweight steel composite frame was composed of square CFST columns, H-shaped steel beams, double L-shaped joints, and concrete floors. The perlite insulation reinforced with steel wire mesh composite wall was composed of steel wire mesh reinforced mortar surface, perlite board, and EPS board. The lightweight steel composite frame was enclosed by PSW. The lightweight steel composite frame and PSW were assembled through the new connection of “packaging and gripping”. The wall units were connected through the “tongue-and-groove” connection. A full-scale two-story prefabricated lightweight steel composite frames-perlite insulation reinforced with steel wire mesh composite wall structure was subjected to seismic loading under 57 working conditions including white noise(PGA:0.07g~1.50g). The damage evolution process, stiffness degradation, displacement response, and strain characteristics were discussed and analyzed. The results showed that: The PSW worked together with a lightweight steel composite frame and the PSW improved the lateral stiffness of the lightweight steel composite frame;With the increase of the input peak ground acceleration(PGA), the natural frequency of the structure decreased and the damping ratio increased;Under the action of 8-degree fortification earthquake(0.20g), the maximum story displacement angle was 1/361, and the structure was in the elastic stage;There was no significant damage to the structure under the action of 8-degree rare earthquake(0.51g);Under the action of an extremely rare earthquake, the damage of exterior wall was obvious, and the lightweight steel composite frame was basically intact. The flexible connection of “packaging and gripping” weakened the seismic response of the wall and improves the energy dissipation between the PSW and the lightweight steel composite frame.