基于OpenSEES的地震作用下相邻框架结构碰撞反应分析

Analysis of Seismic Pounding of Adjacent Frame Structure Based on OpenSEES

选用开源有限元软件OpenSEES材料库中的缝单元Compression-Gap来模拟相邻结构之间的碰撞,建立一个相邻的11层与4层钢筋混凝土框架结构碰撞模型,并利用一组已有钢筋混凝土框架结构拟静力倒塌试验数据对模型中采用的材料本构模型进行验证。研究相邻结构间距为无缝和规范缝情况下,地震动峰值加速度取不同值时碰撞对相邻结构的位移和层间位移角响应的影响。研究表明,碰撞作用会使11层结构正向峰值位移减小,负向峰值位移增大;4层结构的正向和负向峰值位移均减小。碰撞作用还使11层结构的正向层间位移角在4层以上增大,在4层以下减小,负向层间位移角整体上在各层均增大;4层结构的正向和负向层间位移角均减小。此外,无缝情况下碰撞对结构位移和层间位移角的影响均大于缝宽为规范缝的情况。

The pounding of adjacent structures is simulated by Compression-Gap in the material library of OpenSEES which is an open-source finite element software.A pounding model of adjacent11-storey and4-storey structures is built,and the material constructive models used in the pounding model are verified by a set of existing data of pseudo-static collapse experiments of RC frame structure.The influence of pounding on the displacement response and inter-story displacement angle response of adjacent structures with and without seismic joint under different ground peak acceleration are discussed.This research shows that pounding will increase the positive peak displacement response but decrease the negative peak displacement response of11-storey structure,and both the positive and negative peak displacement response of4-storey structure are inhibited.The positive inter-story displacement angle response of11-storey structure under4-storey will increase but be decreased upper4-storey,and the negative inter-story displacement angle response of11-storey structure will increase,and both the positive and negative inter-story displacement angle response of4-storey structure areinhibited.In addition,the pounding under seamless condition has greater influence of structure's seismic response than standard seismic gap condition.