- 摘 要
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（羅馬第三大學(xué)建筑系， 羅馬 00146）
［摘要］研究了如何通過被動耗能方式對既有框架進(jìn)行抗震加固。提出了一個基于能力譜和位移控制的迭代設(shè)計流程，并結(jié)合既有中心支撐鋼框架結(jié)構(gòu)討論了該設(shè)計流程在實際應(yīng)用中的有效性。該設(shè)計流程能夠用于基于不同性能目標(biāo)、采用任何類型的耗能裝置進(jìn)行抗震加固。在加固時采用的屈曲約束支撐用來防止結(jié)構(gòu)構(gòu)件和非結(jié)構(gòu)構(gòu)件的破壞。采用了傳統(tǒng)的單模態(tài)Pushover分析（荷載和第一階模態(tài)成正比）和多模態(tài)Pushover分析對既有框架結(jié)構(gòu)的抗震加固進(jìn)行分析。分析發(fā)現(xiàn)，對于中高層框架混凝土結(jié)構(gòu)房屋（30m以上），耗能支撐設(shè)計過程中采用多模態(tài)Pushover分析比單模態(tài)Pushover分析結(jié)果更有效；然而采用屈曲約束支撐進(jìn)行抗震加固后，房屋剛度變得規(guī)則，此時單模態(tài)Pushover分析和多模態(tài)Pushover分析得到的結(jié)果差別不大。
［關(guān)鍵詞］耗能支撐; 地震工程; 能量耗散; 抗震加固
中圖分類號：TU352.1 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)07-0015-06
Seismic retrofitting of reinforced concrete frame and concentric braced steel buildings with dissipative bracings
A.V. Bergami, Xu Liu, Zhihao Zhou, C. Nuti
(Department of Architecture, Roma Tre University, Rome 00146, Italy)
Abstract: Seismic retrofitting of existing frame structures by means of passive energy dissipation was presented. An iterative displacement-based procedure, based on capacity spectrum was described and some applications were discussed. The general procedure had also been discussed referring to the case of existing steel concentric braced frame structures (CBF). The procedure can be used with any typology of dissipative device and for different performance targets. The procedure had been applied, with both traditional Pushover (load profile proportional to first mode) and multimodal Pushover, to an existing RC frame building. In the application presented the buckling restrained braces had been used in order to prevent damages to both the structure and non structural elements. The use of multimodal Pushover proves to be more effective than Pushover based on single mode in case of medium rise RC frame building (higher than 30 metres) but, once this building is retrofitted, and therefore regularized, with a bracing system, the difference between using the monomodal or multimodal Pushover becomes not significant.
Keywords: dissipative brace; earthquake engineering; energy dissipation; seismic retrofitting
作者簡介：Bergami A.V.，博士，研究員，Email: alessandro.bergami@uniroma3.it。
參考文獻(xiàn)
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