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为了研究多维地震作用下钢筋混凝土核心筒结构的抗震性能,对2个尺寸配筋相同的钢筋混凝土核心筒试件分别进行了水平单向加载和水平双向加载条件下的拟静力试验。重点比较了双向加载对核心筒的破坏形态、破坏机理、承载能力、耗能能力、延性等方面的抗震性能的影响。结果表明:水平双向加载对核心筒抗震性能有显著影响,水平双向荷载作用使得核心筒的承载力较单向荷载作用明显下降,同时严重削弱了筒体变形和延性性能。初步研究结果显示仅考虑单向地震动作用分析混凝土核心筒结构的抗震能力可能严重偏于不安全,应引起学术和工程界的高度重视。
In order to study the seismic behavior of reinforced concrete core tube structure under multi-dimensional earthquake, the pseudo-static tests of two reinforced concrete core tube specimens of the same size under the condition of horizontal unidirectional loading and horizontal bidirectional loading respectively were carried out. The influence of two-way loading on the seismic behavior of the core tube, such as failure mode, failure mechanism, bearing capacity, energy dissipation capacity and ductility, was compared. The results show that horizontal bidirectional loading has a significant effect on the seismic behavior of the core tube. The horizontal two-way load causes the core tube’s capacity to decrease obviously compared with the one-way load, meanwhile, the deformation and ductility of the core tube are severely weakened. Preliminary results show that considering the seismic behavior of concrete core tube structure considering only one-way ground motion can be seriously unsafe and should be paid great attention by the academic and engineering communities.