型钢-混凝土后锚固节点抗震性能试验研究

Experimental Study on Seismic Behavior of Post-Installed Anchors in Steel-to-Concrete Connections

进行了四个型钢与混凝土后锚固连接节点的低周反复加载试验,采用化学植筋式连接方式。试件破坏前钢筋均达到屈服,仅钢筋周围的混凝土发生局部破坏,可判断为钢材破坏。随着埋深的增加,试件的屈服荷载和峰值荷载均有不同程度的提高。滞回曲线、刚度退化曲线、延性及耗能等抗震指标均显示该类节点具有较好的抗震性能,达到峰值荷载后承载力无明显降低,仍能以自身的变形能力吸收地震能力,增加埋深和植筋数量有助于提高节点的抗震性能。

Four steel-to-concrete connections made with bonded-in reinforcement under re versed cyclic loading have been tested.The results show that steel bars reach y ield strength before connection failure and the ultimate capacity is governed by strength of reinforcement following slight concrete cone failure nearby.Both y ield load and ultimate capacity of connections increase individually with more e mbedment depth of bonded-in reinforcement.Seismic characteristics of hysteresi s curves,ductility and dissipation are used to draw conclusions that the connec tions would behave without significant reduction of loading capacity after maxim um value and appropriate deformability is beneficial to dissipate earthquake ene rgy.Increased embedment depth and added amount of bonded-in reinforcements are helpful to improve seismic performance of connections.