位于地震区的未予抗震设防或设防不足而需要进行抗震加固的已有建筑物,从安全经济目的出发,一般都采用弹塑性加固方案。其要点是:通过加固使原有建筑物具有适当的强度以抵抗地震力,同时还要使建筑物具有足够的延性以抵抗较大的位移(主要是水平位移)。因此,实际的抗震加固方案可以分为三种类型,即: Existing buildings that are not seismically fortified or lacked in the earthquake zone and require seismic strengthening are generally elastoplastic reinforcement schemes based on safety and economic purposes. The main points are: Reinforce the original building with appropriate strength to resist seismic forces, and at the same time make the building have sufficient ductility to resist larger displacement (mainly horizontal displacement). Therefore, the actual anti-seismic reinforcement scheme can be divided into three types, namely: