考虑地震环境下现役结构抗震加固设防地震动参数研究

Research on seismic strengthening design ground motion parameters for existing buildings based on seismic hazard characteristic zone

提出了现役结构抗震加固设计基准期的概念,并提出了不同重要性的现役结构抗震加固设计基准期的取值原则,分析了现役结构抗震加固的设防目标。在用形状参数k作为表征不同地区地震危险性差异的基础上,由地震烈度的危险性曲线公式推导了设计地震加速度Amax和地震影响系数αmax的危险性曲线计算公式,进而对具有不同后续设计使用寿命期的现役结构不同设防水准的抗震加固设防地震动参数进行了研究,给出了设计地震动参数的计算步骤,为现役结构的抗震加固设计提供了依据。

The conception of seismic strengthening design reference periods of existing buildings is presented,sampling principle of the design reference periods for existing buildings with different importance is put forward,the seismic strengthening fortification aims of existing buildings is analyzed.After the shape parameter k is used to represent the seismic hazard differences of different areas,the seismic hazard curve formula of design acceleration Amax and earthquake influence coefficient αmax are deduced according to the seismic hazard curve of intensity.At last the seismic strengthening design ground motion parameters at different design level for existing buildings with different subsequent design useful life periods are researched,computation steps of design ground motion parameters is given.