预制混凝土框架结构振动台试验研究

Shaking Table Experimental Study on a Precast Concrete Frame

对一预制混凝土框架结构的1/5缩尺模型进行了振动台试验,得到了结构的自振特性以及加速度、位移、剪力等反应的包络图,详细记录了结构在试验中发生的破坏现象。试验表明,结构的节点刚度退化迅速,层间位移较现浇结构明显偏大,但梁、板、柱等构件均较为完好。文中建议进一步加强连接螺栓的强度并寻找后浇混凝土的替代方案,以提供更好的延性和耗能能力。

A shaking table model test of a precast concrete frame was conducted in State Key Laboratory for Disaster Reduction. Dynamic properties of the model, acceleration character, maximum interstory drifts and the distribution of shear force were figured out. Phenomenon during the test was described in detail. Test results show that the deterioration of the connection stiffness is very rapid and interstory drifts are more bigger than those of cast-in-situ concrete frame, but no severe damage happened on columns, beams and slabs. Further suggestions were given that the strength of connection bolts should be reinforced and alternative scheme of postpouring concrete should be considered for better ductility and energy dissipation.