Discriminative model and experimental validation of zero-length plastic hinge instability of post-burst reinforcement skeleton
In order to study the impact of the residual load-bearing capacity of the skeleton on the instability and collapse of buildings(structures),a zero-length plastic hinge calculation model was established based on the shape of the column reinforcing skeleton and its stress after blasting,and the load-bearing capacity tests of the residual reinforcing skeleton were conducted under different degrees of blast damage.The results show that the height and degree of bending have a significant effect on the load-bearing capacity of the column reinforcement skeleton after blasting,when the initial deflections are close,the peak load capacity of the specimens decrease linearly with increasing height of the skeleton.When the heights of the skeleton are the same,the peak load bearing capacity of the specimens decrease non-linearly with the increase of bending degree;Compared with the traditional Eulerian isotropic compression rod model and the initial bending compression rod model,calculation results of the zero-length plastic hinge instability model are closer to the test values.The research results have certain reference significance for designing the demolition of tall buildings(structures)by blasting and analysing anti-continuous collapse.
drilling and blastingzero-length plastic hingereinforcement skeletonreinforced concrete columninstability discrimination
万方数据
维普
