GFRP加固节点的钢筋混凝土框架结构的弹塑性时程分析

Elasto-plastic Time Analysis of Reinforced Concrete Frame Structures with GFRP Reinforced Nodes

针对我国抗震规范调整,使许多现有结构无法满足抗震规范要求,用GFRP管对其节点进行加固从而增加其整体的抗震性能.采用PKPM设计了4层两跨的框架结构,采用管厚为3、6、9 mm的GFRP加固.用有限元软件Abaqus,建立了有限元模型,对加固前后的结构进行了弹塑性时程分析,比较了加固前后的结构顶点位移、层间最大位移、层间最大位移角及塑性铰区的变化.结果表明加固后的顶点位移、层间最大位移、层间最大位移角均明显小于加固前的顶点位移、层间最大位移、层间最大位移角,并满足规范要求,具有一定的安全性.

According to the adjustment of China's seismic code,many existing structures cannot meet the requirements of seismic code.Therefore,this paper proposed that GFRP(Glass Fiber Reinforced Polymer)pipes can be used to reinforce their joints so as to increase their overall seismic performance.A four-story two-span frame structure was then designed using PKPM,and GFRP with a tube thickness of 3,6,and 9 mm was used for reinforcement.A finite element model was established with the finite element software Abaqus,and the elasto-plastic time analysis of the structure before and after reinforcement was carried out.The vertex displacement of the structure before and after reinforcement,the maximum inter-story displacement,the maximum inter-story displacement angle and the changes of plastic hinge zone were compared.The results show that the vertex displacement,the maximum inter-story displacement,and the maximum inter-story displacement angle after reinforcement are significantly smaller than those before reinforcement,meeting the code requirements with certain safety reserve.