框架结构能量流网络及其初步应用

从考察框架结构在各种荷载条件下的能量流动出发,考虑结构杆件以及节点的能量流动状况,建立框架结构的能量流动网络。比较各杆件和节点的能量流动方向及大小,按图论方法得到框架结构内能量流动的关键路径,即结构的最大传力途径;通过比较拆除不同杆件对结构系统总体应变能影响的大小,确定结构杆件的重要性;通过跟踪结构杆件的破坏顺序以及结构杆件重要性的变化,确定结构最重要破坏模式。对唐山大地震中倒塌的一个3层框架作了分析,结果表明这种方法可以充分考虑结构受不同荷载作用的影响,可以确定框架结构的杆件重要性、最大传力途径以及最重要破坏模式。

Network of energy transfer in frame structures and its preliminary application

Based on the energy transfer in frame structures under various loading conditions,a network of energy transfer is constructed for structural members and joints.Using the graph theory,the key path of energy transfer in frame structures,namely the most important loading-carrying path,is determined in accordance with the energy transfer in and out of members and joints.By comparing the change of strain energy in the structure with different members removed,the index of member importance is introduced.By tracing the change of the index of member importance due to failure of members,the most important failure mode is determined.A three-story frame collapsed during the Tangshan earthquake is analyzed,illustrating that the presented procedure is effective in determining the index of member importance,the most important load-carrying path as well as the most important failure mode,with full consideration of different loading conditions.