高烈度区钢网格盒式筒中筒结构力学性能分析

Analysis of mechanical properties of steel grid cassette cartridge tube-in-tube structure in highly seismic region

为研究新型装配整体式空间钢网格盒式筒中筒结构在大震作用下的力学性能,包括结构自振特性,结构剪力分配规律,倾覆弯矩分配规律,侧移分布规律,剪力滞后现象等。以某高烈度区拟建工程为背景,采用MIDAS软件,对比了盒式筒中筒结构和常规框筒结构、筒中筒结构的力学性能差异。分析结果表明:与筒中筒结构和框架—核心筒结构相比,盒式筒中筒结构具有更小的剪力滞后现象,更大的抗侧刚度和抗剪刚度,更好的抗震性能和整体协同工作能力,经济效益显著。

The mechanical properties of newly assembled spatial steel grid cassette tube-in-tube structures subjected to seismic actions,such as the free vibration characteristics,shear distribution,overturning moment distribution,lateral distribution,shear lag phenomenon of the structures,were analyzed. Taking a building to be constructed in highly seisimc region as an example and using the MIDAS software,the new cassette tube-in-tube structure system was compared with the conventional frame tube structures and tube-in-tube structures. Analysis results show that the cassette tube-intube structures have smaller shear lag phenomenon,greater lateral stiffness and shear stiffness and better seismic performance than those of the tube-in-tube structures and frame tube structures. In addition,the new cassette structures are cost efficient.