高烈度区新型装配整体式空间钢网格盒式筒中筒结构抗震性能研究

Study on Seismic Performance of New Assembled Monolithic Space Steel Grid Box Tube-in-Tube Structures in High Earthquake Intensity Area

本文介绍了新型装配整体式空间钢网格盒式筒中筒结构体系的组成。以高烈度地区某拟建工程为例,采用MIDAS-Building有限元软件建立数值分析模型,在满足小震不坏的前提下进行大震作用下Pushover分析,从结构层间位移,层间位移角和塑性铰分布等方面对结构抗震性能进行评估。分析发现,该结构塑性铰按内筒连梁、外筒层间梁、楼层梁、核心筒剪力墙、外框筒柱的顺序出现,各个阶段的耗能作用比较明确。分析结果表明,该结构满足"大震不倒"的设防标准,适用于高烈度地区。

New Assembled Monolithic Space Steel Grid Box Tube-in-Tube Structures were introduced. Taking a proposed strucutrue in high earthquake intensity area as example, finite element model was built by using MI- DAS-Building software. On the premise that the structure is not damaged under small earthquakes, pushover a- nalysis was performed when the structure is under strong earthquakes. Seismic performance of the structure was analyzed from several aspects such as layer structure displacement, inter-layer displacement angle and plastic hinge distributions. Numerical analysis indicated the plastic hinges occurred successively on the tube coupling beams, outer tube inter-layer beams, floor beams, core tube shear wall and outer tube columns. The mechanism of energy consumption in each stage was clear. Therefore, the new structure can meet the standard of ＂no col- lapse under severe earthquakes＂ and is suitable for high earthquake intensity area.