Structural design of single-side large cantilever over-limit high-rise building of Nanjing Central Hospital complex building reconstruction project
The Nanjing Central Hospital complex building reconstruction project has a narrow site,a limited height,and a basement area occupied by adjacent basements,the structure of the single-side large cantilever was adopted.On the premise of fully considering the cost and construction feasibility,the following conclusions are drawn through analysis and comparison:the large cantilever part of high-rise building can adopt the multi-storied steel vierendeel trusses with the advantages of low structural height,optimal space utilization,and convenient installation;through the reasonable substructure splitting of the vierendeel truss,lockable-sliding joints are set in the middle of the vertical web members,which can solve the technical difficulty of erecting vierendeel trusses without scaffolding and eliminate the uneven internal forces caused by the construction sequence;when there are many stories of vierendeel trusses,the additional internal forces generated by the vertical deformation of the supporting columns cannot be ignored;to address the issue of the distance between the new project and the adjacent existing basements is very close,measures such as high-capacity post grouting bored pile,single-sided formwork for basement exterior walls,and removal of adjacent foundation pit support piles can be adopted;the seismic damage of reinforced concrete frame-shear wall structure in low intensity area typically occurs in the coupling beams,the use of replaceable steel coupling beams helps achieve the performance target of maintaining normal structure use under moderate earthquakes.
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