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    吳學(xué)淑
    (上海建科結(jié)構(gòu)新技術(shù)工程有限公司，上海200032)

[摘要] 依據(jù)加固設(shè)計(jì)使用年限確定抗震設(shè)防烈度，繼而確定抗震加固設(shè)計(jì)的地震加速度峰值。用結(jié)構(gòu)的目標(biāo)位移表示結(jié)構(gòu)的性能目標(biāo)，提出基于位移的耗能減震加固設(shè)計(jì)方法。根據(jù)結(jié)構(gòu)的目標(biāo)層問(wèn)位移角及其對(duì)應(yīng)的結(jié)構(gòu)變形曲線確定結(jié)構(gòu)各層的位移，在此基礎(chǔ)上，將多自由度體系等效成單自由度體系。依據(jù)位移反應(yīng)譜確定單自由度體系在己定水準(zhǔn)地震動(dòng)下滿足位移要求所需的總阻尼比，該阻尼比可以近似認(rèn)為是多自由度體系滿足性能要求所需的總阻尼比?？傋枘岜葴p去結(jié)構(gòu)的阻尼比得到阻尼器的等效阻尼比。根據(jù)阻尼器的等效阻尼比確定阻尼器的阻尼系數(shù)，并對(duì)阻尼系數(shù)進(jìn)行優(yōu)化分布。最后用文中提出的方法對(duì)某鋼框架結(jié)構(gòu)進(jìn)行加固設(shè)計(jì)。
[關(guān)鍵詞] 設(shè)計(jì)使用年限；基于位移的方法；耗能減震；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