Based on the strengthening object of existing C-category frame of school building for improving one grade of precautionary intensity

some difficulties in seismic strengthening work were analyzed

which include the contents and requirements of earthquake action calculation

structural seismic checking

seismic design details

and measures.Moreover

some issues in the application of traditional seismic strengthening methods were pointed out

and the possibility of energy dissipation technology applied to retrofit of school building for improving one grade of precautionary intensity was discussed.In the end

a retrofitting project of existing C-category frame of school building was taken as an example: firstly

retrofitting design for this frame with energy dissipation devices was conducted to determine the distribution of supplemental viscous dampers on every story

as well as their product performance parameters;then

the validity and maneuverability of energy dissipation technology to seismic retrofit of this frame were demonstrated

which were conducted by the following four aspects: analysis of control effect to seismic responses of the damping structure

checking of the elastic-plastic deformation

appraisal of the energy dissipation components and verification of the seismic design details.The results show that energy dissipation technology has many advantages in its application to seismic retrofit of school buildings.It can effectively control the structural seismic responses and consequently ensures the seismic measures to be approximately lower than the original requirements based on the practical damping effects.Thus

it is concluded that the energy dissipation technology can be well applied to C-category frame of school building strengthening and meet certain retrofitting requirement as long as adopting rational design.