吴学淑
    (上海建科结构新技术工程有限公司，上海200032)

[摘要] 依据加固设计使用年限确定抗震设防烈度，继而确定抗震加固设计的地震加速度峰值。用结构的目标位移表示结构的性能目标，提出基于位移的耗能减震加固设计方法。根据结构的目标层问位移角及其对应的结构变形曲线确定结构各层的位移，在此基础上，将多自由度体系等效成单自由度体系。依据位移反应谱确定单自由度体系在己定水准地震动下满足位移要求所需的总阻尼比，该阻尼比可以近似认为是多自由度体系满足性能要求所需的总阻尼比。总阻尼比减去结构的阻尼比得到阻尼器的等效阻尼比。根据阻尼器的等效阻尼比确定阻尼器的阻尼系数，并对阻尼系数进行优化分布。最后用文中提出的方法对某钢框架结构进行加固设计。
[关键词] 设计使用年限；基于位移的方法；耗能减震；加固

    Seismic retrofit with dampers considering design working life and displacement
    Wu Xueshu
    ( Shanghai Advanced Building Technology Co., Ltd., Shanghai 200032, China)

Abstract: This paper proposes that design working life determines seismic fortification intensity and then earthquake acceleration peak. The paper presents a displacement-based seisnuc retrofit method with dampers, using a target displacement to express performance target. Every story's displacement is calculated from the target storey drift and the approximate profile of structure. And then, MDOF structure is transferred to SDOF model. The required amount of the SDOF model's damping to satisfy displacement demand for given earthquake wave is evaluated through displacement spectrum. The damping obtained can be the approximation of the overall demand damping of MDOF structure. The supplemental damping provided by dampers is the difference between the overall demand damping and the inherent damping of structure. Then, the damping coefficient is identified and its distribution is optimized. At last, a steel-frame structure is strengthened with method suggested in the paper.
Keywords: design working life; displacement-based design method; energy dissipation; retrofit