机械拆除条件下框架结构楼房荷载动态调整机制研究OA

Focusing on the issue of dynamic load redistribution during mechanical demolition of high-rise build-ings,this study takes the mechanical demolition of an 8-story frame structure building in Wuhan City as the engineer-ing background.First,a field test was conducted on the cutting and removal of a single column,using dynamic strain testing techniques to measure real-time load transfer characteristics in the overlying beam.Subsequently,the LS-DY-NA was used to simulate the single-column mechanical demolition field test scenario,and the numerical model's reli-ability was verified by comparing simulation results with field-measured data.Finally,the established numerical mod-el was used to simulate mechanical demolition conditions,analyzing internal force variations to investigate dynamic load redistribution mechanisms and structural failure characteristics.The results indicate that during single-column removal,tensile strain of 102 magnitude occurred at the bottom of the near-end beam.In contrast,the far end devel-oped compressive strain ranging from 101 to 102.The structural system redistributed internal forces through beam bending.During sequential column demolition,individual column failures generated transient tensile stresses in neighboring columns.Variations in demolition sequence and time intervals substantially altered stress redistribution pathways across structural components,leading to non-uniform force distribution.Additionally,stress concentration and structural deformation exhibited certain delays during sequential demolition,which may induce directional devia-tions in collapse patterns.The findings of this study can provide valuable references for the design of mechanical demolition of high-rise buildings and the analysis of dynamic load adjustment in structures.