China is a multi-seismic country, therefore, in order to enhance the effect of seismic, non-earthquake-stricken areas of anchoring rebar can not use the light round steel bar. 

The reason is that the round steel bar can not form a mechanical tooth key, the long-term anchoring performance of the planted reinforcement can not be guaranteed, and it is easy to leave a hidden danger to the load-bearing structure.There for improve the quality of the project, increase the seismic performance of the house, must be limited to the use of the round steel bars .