减震设计与抗震设计RC框架结构抗地震倒塌能力对比

与传统抗震设计不同，结构的消能减震设计通过在结构上设置减震装置以消耗地震输入能量，达到减轻主体结构地震响应的目的，在满足相同的设计要求下，减震设计结构由于阻尼器的耗能作用，其截面尺寸或配筋较抗震设计结构有一定的优化。根据我国抗震规范，按传统抗震方法和消能减震方法分别设计了一组钢筋混凝土框架结构。采用基于动力增量时程分析方法的结构抗倒塌易损性分析流程，对不同设计方法所设计的框架结构的抗地震倒塌能力和抗倒塌安全储备进行了定量评价，并对计算结果进行了对比分析。根据分析结果提出了提高高烈度区减震设计框架结构抗倒塌能力的相关措施，并通过算例验证了所提措施的有效性。

COMPARISON OF COLLAPSE-RESISTANCE CAPACITIES OF RC FRAMES WITH AND WITHOUT DAMPERS

Different from conventional seismic design methods, seismic damping design method adds dampers in a structure which can dissipate input energy to control the structural seismic response. As a result, the member section sizes or the amount of reinforcement in the structure with dampers may be reduced from those without dampers. A series of reinforced concrete frame structures with nonlinear viscous fluid dampers as well as those ordinary frames without dampers are designed based on the current Chinese seismic design code for different seismic hazard levels. The seismic collapse-resistance capacity and safety margin of all these frames are calculated and compared through a collapse fragility analysis based on an incremental dynamic analysis approach. According to the results, a suggestion is proposed to enhance the collapse-resistance capacity of damping designed structures for high seismic hazard levels, and the effectiveness of the suggestion is verified.