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（1 北京建筑大學(xué)土木與交通工程學(xué)院， 北京 100044；2 國(guó)網(wǎng)北京市電力公司大興供電公司， 北京 102600； 3 香港大學(xué)土木工程系， 香港  999077）

［摘要］老建筑中小跨高比剪力墻的抗震能力往往不能滿足當(dāng)前的抗震設(shè)計(jì)要求，尤其是底部或轉(zhuǎn)換層中的剪力墻，在高軸壓比下容易發(fā)生脆性剪切破壞而導(dǎo)致整個(gè)剪力墻體系的倒塌。為了提高既有小跨高比剪力墻在地震中的抗倒塌性能，提出了一種新型的開縫鋼板加固法。研究了開縫鋼板加固法對(duì)鋼筋混凝土剪力墻的破壞形式、滯回曲線、延性和抗倒塌性等受力性能的影響。按照高寬比1[DK]∶1的比例制作4個(gè)鋼筋混凝土剪力墻試件，并對(duì)其中的1個(gè)試件使用未開縫鋼板進(jìn)行加固和對(duì)2個(gè)試件使用開縫數(shù)量不同的鋼板進(jìn)行加固。通過低周反復(fù)荷載及高軸力試驗(yàn)表明，未進(jìn)行鋼板加固的剪力墻和采用未開縫鋼板加固的剪力墻均發(fā)生了倒塌破壞。而采用開縫鋼板加固的剪力墻未發(fā)生倒塌破壞，并且其延性和耗能能力都有所提高。

［關(guān)鍵詞］加固； 剪力墻； 開縫鋼板； 抗倒塌性能

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)02-0036-07

Experimental study on collapse resistance performance of existing reinforced concrete shear wall strengthened by slotted steel plate

Cheng Bei1， Zhou Mengjie2， Daniel T.W. Looi3， Yang Cantian1

(1 School of Civil Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044， China； 2 State Grid Beijing Daxing Electric Power Supply Company, Beijing 102600， China；3 Department of Civil Engineering, The University of Hong Kong， Hong Kong 999077，  China)

Abstract:The seismic capacity of shear walls with small and medium span-to-height ratios in old buildings often fails to meet the current seismic design requirements. In particular, the shear walls in the bottom or transfer story are prone to brittle shear failure under high axial compression ratio, which leads to the collapse of the whole shear wall system. In order to improve the collapse resistance performance of existing shear walls with small span-to-height ratios in the earthquake, a new method of strengthening with slotted steel plates was proposed. The influences of slotted steel plate reinforcement on the failure modes, hysteresis curves, ductility and collapse resistance of reinforced concrete shear walls were studied. Four specimens of reinforced concrete shear wall were fabricated according to the ratio of height to width of 1:1, and one of them was strengthened with non-slotted steel plates, and the rest two specimens were strengthened with slotted steel plates of two different slot numbers. The results of low cyclic repeated load and high axial load tests show that both shear walls without steel plate reinforcement and shear walls with non-slot steel plate reinforcement are collapsed. However, the shear wall strengthened with slotted steel plates does not collapse, and its ductility and energy dissipation capacity are improved.

Keywords:strengthening; shear wall; slotted steel plate; collapse resistance performance

*國(guó)家重點(diǎn)研發(fā)計(jì)劃資助(2017YFC0703600)，北京市自然科學(xué)面上基金項(xiàng)目（8162014），國(guó)家自然科學(xué)青年基金項(xiàng)目( 51208023)。

作者簡(jiǎn)介：程蓓，博士，副教授，Email：chengbei@bucea.edu.cn。