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（1 廣州大學(xué)土木工程學(xué)院， 廣州 510006； 2 華南理工大學(xué)土木與交通學(xué)院,  廣州 510640；3華南理工大學(xué)亞熱帶建筑科學(xué)國家重點(diǎn)實(shí)驗(yàn)室, 廣州 510640）

［摘要］為了控制剪力墻尤其是核心筒剪力墻由于高寬比較小，地震作用下剪力墻底部損傷嚴(yán)重，提出帶分離式軟鋼耗能器開縫組合墻，研究表明帶軟鋼耗能器開縫組合墻是以彎曲破壞為主、延性較好的抗側(cè)力構(gòu)件。以一典型框架-核心筒高層結(jié)構(gòu)為研究對(duì)象，以帶軟鋼耗能器開縫組合墻替代部分傳統(tǒng)剪力墻，從結(jié)構(gòu)整體響應(yīng)、構(gòu)件材料損傷、結(jié)構(gòu)耗能、地震易損性等方面對(duì)比組合墻結(jié)構(gòu)與傳統(tǒng)低矮剪力墻結(jié)構(gòu)的抗震性能差異。分析結(jié)果表明：帶軟鋼耗能器開縫組合墻核心筒結(jié)構(gòu)與普通核心筒結(jié)構(gòu)抗側(cè)剛度相當(dāng)。強(qiáng)震作用下，與普通剪力墻核心筒結(jié)構(gòu)相比，開縫組合墻核心筒結(jié)構(gòu)的底層剪力墻耗能減少44%，核心筒混凝土最大壓應(yīng)變下降29%，避免了結(jié)構(gòu)出現(xiàn)嚴(yán)重?fù)p傷，顯著降低了耗能過于集中底層剪力墻。對(duì)比兩結(jié)構(gòu)地震易損性，開縫核心筒結(jié)構(gòu)在輕微損傷、中度損傷、嚴(yán)重?fù)p傷三個(gè)性能水準(zhǔn)下的超越概率比普通核心筒結(jié)構(gòu)分別下降了9.22%，65.24%，84.59%。研究證明了在高烈度區(qū)，以帶軟鋼耗能器開縫組合墻替代核心筒結(jié)構(gòu)剪力墻，可以有效解決強(qiáng)震作用下核心筒底部剪力墻損傷嚴(yán)重問題，框架-核心筒結(jié)構(gòu)可以獲得更高性能水準(zhǔn)。

［關(guān)鍵詞］核心筒結(jié)構(gòu)； 開縫耗能組合墻； 軟鋼耗能器； 結(jié)構(gòu)損傷； 耗能控制

中圖分類號(hào)：TU973+.19文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)14-0110-06

Study on seismic performances of slit composite shear wall core tube structures with separated mild  steel dampers

WU Yi1, YANG Chun2,3, HUANG Zuhuan1, CHEN Lin1, ZHANG Chunmei1

(1 School of Civil Engineering, Guangzhou University， Guangzhou 510006，  China；2 School of Civil Engineering and Transportation， South China University of Technology， Guangzhou 510640，  China；3 State Key Laboratory of Subtropical Building Science， South China University of Technology， Guangzhou 510640，  China.)

Abstract:In order to control serious damage of bottom shear walls especially core tube shear walls due to small shear-span ratio under earthquake actions, slit composite shear wall with separated mild steel dampers was proposed. Researches showed that new slit composite shear walls, as lateral resisting components, are of flexural failure pattern and good ductility. A typical frame-core tube high-rise structure was selected, and parts of shear walls were substituted by new slit composite shear walls. Seismic performances including integral seismic responses, material damage of components, structural hysteretic energy and seismic fragility of normal shear wall core structure and new slit composite shear wall core structure were compared. Results showed that no obvious difference of lateral stiffness of two structures could be found. Under strong earthquake actions, compared to normal shear wall core tube structure, hysteretic energy of bottom shear wall of new composite shear wall structure reduce by 44%, the maximum compressive strain of concrete decrease by 29%, so serious structural damage and concentration of hysteretic energy at bottom layer are avoided. Comparing seismic fragility of the two structures, according to three performance levels, mild damage, moderate damage and serious damage, the exceedance probability of new composite shear wall structure decrease by 9.22%, 65.24% and 82%, respectively. Therefore, in highly seismic area, slit composite shear wall with separated mild steel dampers could be a good substitute for normal shear wall for high-rise core tube structure, damage concentration at bottom core shear wall can be effectively controlled, higher performance level can be achieved.

Keywords:shear wall core tube structure； slit composite shear wall with dampers； mild steel damper； structural damage； control of  energy dissipation

作者簡(jiǎn)介：吳軼，博士，教授，Email:77085703@qq.com。