带不同类型组合暗支撑剪力墙抗震性能试验研究

本文选取剪力墙结构体系中较为薄弱的抗震构件一字形截面剪力墙,采用不同类型的暗支撑进行了4个1/3缩尺的带暗支撑剪力墙构件的低周反复荷载试验,4个模型分别为普通剪力墙、带钢筋暗支撑剪力墙、带型钢暗支撑剪力墙、带钢筋-型钢暗支撑剪力墙。试验表明,带暗支撑剪力墙的主斜裂缝角度有明显向暗支撑的角度逼近的趋势,其裂缝细密且分布区域较大,墙体耗能能力较强。带暗支撑剪力墙比普通剪力墙底部塑性耗能区的高度显著增大。与普通剪力墙相比,带暗支撑剪力墙的屈服荷载、极限荷载明显提高,后期刚度稳定性较好,延性系数及耗能能力显著提高,滞回环饱满,抗震性能比普通剪力墙显著改善,特别是带钢筋-型钢组合暗支撑剪力墙的抗震性能提高最为显著。

Experimental study on seismic performance of RC shear wall with different types of composite concealed bracings

In this paper,firstly,the rectangle section shear wall was selected to research because it is the relatively weak seismic member in shear wall structural system.Secondly,the experimental studies on the seismic performance of four 1/3 scale shear walls with different types of concealed bracings under cyclic loading were carried out.The four test specimens includes one common shear wall,one with concealed steel bar bracings,one with concealed shape steel bracings and one with concealed steel bar and shape steel bracings.The experimental results show that the primary inclined crack of shear wall with concealed bracings tends to develop towards the angle of concealed bracings,and that the narrow cracks distribute across a wide area.The energy dissipation capacity of shear wall with concealed bracings is large.The height of the zone of the potential plastic hinge of shear wall with concealed bracings is longer than conventional shear walls.Compared with conventional shear wall,the cracking load,yielding load and ultimate load of shear walls with concealed bracings are increased obviously;their stiffness in later stages of loading have better stability;their ductility factor and the energy dissipation value are increased greatly and their hysteretic loops are plumber.The seismic performance of the shear wall with concealed bracings are improved greatly.In addition,the seismic performance of the shear wall with concealed steel bar and shape steel bracings is the best among four specimens.