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给出多层建筑物基于能量的连续倒塌评估方法,从能量流的角度分析钢框架结构的连续倒塌。该文引入基于能量的构件评估方法,并与传统的荷载-变形方法进行比较;讨论了能量流分析法在解释地震事件中的优势。从整体看来,只有当动能通过结构全部耗散时,建筑物才不会倒塌,达到稳态构型。否则,残余动能会导致结构继续倒塌。传统建筑物中,动能通过转化为结构构件的变形能而耗散,构件在失稳前能够消耗一定的能量。与地震作用相比,动力荷载作用下柱的变形能能够更好地作为稳定性指标。能量流分析法可用于典型钢结构的倒塌评估。
The assessment method of continuous collapse based on energy in multi-storey buildings is given, and the continuous collapse of steel frame structure is analyzed from the perspective of energy flow. In this paper, the method of energy-based component assessment is introduced and compared with the traditional load-deformation method. The advantage of energy flow analysis in explaining seismic events is discussed. As a whole, the building will not collapse until the kinetic energy dissipates through the structure, reaching a steady-state configuration. Otherwise, the residual kinetic energy will cause the structure to continue to collapse. In traditional buildings, kinetic energy is dissipated by the transformation energy into the deformation of structural members, which can consume a certain amount of energy before destabilization. Compared with the earthquake action, the deformation energy of the column under dynamic load can better serve as the stability index. Energy flow analysis can be used to evaluate the collapse of a typical steel structure.