Research progress on seismic performance improvement technology of existing buildings via externally-attached substructure approach for urban renewal
The externally-attached substructure approach is an effective method to improve the overall seismic performance of the existing structure.By connecting the externally-attached substructure with the existing structure as a whole,the new-old structure systems can work together under the action of earthquake,effectively improving the force transmission mechanism of the existing structure,directionally transferring the damage accumulation of the existing structure,and significantly improving the mechanical properties of the overall system.In addition,as the externally-attached substructure approach is an external operation,it does not affect the normal use of the internal structure,and can achieve the need for non-interference retrofitting,which is more in line with the concept of"urban renewal".In recent decades,the externally-attached substructure approach has been widely used around the world.Aiming at the development status of the externally-attached substructure approach,research on its progress in improving the seismic performance of existing buildings was conducts.First,the overall concept(principle,advantages)of the externally-attached substructure approach was introduced.Secondly,typical retrofitting forms of the externally-attached substructure approach(frame,frame-brace,wall)was introduced.Finally,the key issues of the externally-attached substructure approach(interfacial shear transferring mechanism,joint and connection performance,combination of prefabrication-assembly technology,environment interaction and maintenance cost)were summarized.The result shows that the externally-attached substructure approach still has broad prospects in the next few years.
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