Combined with practical engineering case,a two-story underpinning project in a banquet hall,the influence of the removing columns engineering on the overall performance of structure and the internal force of the original structural was analyzed..According to the stress characteristics of the structure removed columns and the root cause that the related structural members do not meet the requirements,the method of post-ten-sioned prestressed concrete underpinning truss overall reinforcement was proposed.At the same time,the con-struction sequence and anti-collapse analysis in the construction stage of underpinning transformation and rein-forcement were discussed.The results showed that the reinforcement method is safe and reliable,while the rein-forcement range of related structural members can be greatly reduced.
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