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左瓊，白雪霜，王亞勇

（中國(guó)建筑科學(xué)研究院， 北京 100013）

 

［摘要］通過(guò)Pushover方法，評(píng)估了樓板參與作用對(duì)RC框架結(jié)構(gòu)整體承載力和變形能力的影響。結(jié)果表明，由于樓板增加了梁柱線剛度比及梁的受壓區(qū)面積，這一抗彎剛度貢獻(xiàn)提高了結(jié)構(gòu)的超強(qiáng)系數(shù)和延性系數(shù)。“超配”的板筋雖有利于提高結(jié)構(gòu)的超強(qiáng)系數(shù)，但降低了結(jié)構(gòu)的變形能力。因此，在進(jìn)行框架梁設(shè)計(jì)時(shí)，應(yīng)恰當(dāng)?shù)乜紤]樓板的剛度貢獻(xiàn)及減小有效翼緣寬度內(nèi)板筋的作用，以使結(jié)構(gòu)獲得更好的抗倒塌能力。

［關(guān)鍵詞］抗倒塌；有效翼緣寬度；梁柱線剛度比；RC框架結(jié)構(gòu)

中圖分類號(hào)：TU312        文獻(xiàn)標(biāo)識(shí)碼：A        文章編號(hào)：1002-848X(2013)01-0037-04

 

Zuo Qiong, Bai Xueshuang, Wang Yayong

(China Academy of Building Research, Beijing 100013, China)

 

Abstract: Pushover analysis was performed to investigate the effects of floor slab on the integrity strength and deformation capacity of RC frame structures. The results show that, owing to the contribution of floor slab to the beam bending stiffness including the augment of line stiffness ratio of beam and column and the flexural pressure areas of beam, over strength factor and ductility ratio of the structure are improved. Despite the fact that additional reinforcement in slab appreciably advances over strength factor of the structure, ductility of the structure gets worse. Consequently, while designing frame beam, the amplification of beam bending stiffness due to slab should be appropriately taken into account and the additional contribution of the distributed reinforcement along the beam in the effective width of slab should be reduced, so that the structure can attain better collapse-resistance capacity.

Keywords: collapse-resistance; effective slab width; line stiffness ratio of beam and column; RC frame structure

作者簡(jiǎn)介：左瓊，博士研究生，Email: qingzuo@gmail.com

 

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