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仇一顆，劉霞，林云（湖南大學(xué)土木工程學(xué)院，長(zhǎng)沙 410082）

［摘要］深受彎構(gòu)件的拉壓桿模型已經(jīng)得到了廣泛的認(rèn)可。為研究混凝土深梁設(shè)計(jì)中采用的壓桿拉桿模型，進(jìn)行了簡(jiǎn)支深梁集中荷載下的模型靜載試驗(yàn)。試驗(yàn)設(shè)計(jì)依據(jù)為《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》（GB 50010—2010）中深梁的相關(guān)規(guī)定及美國(guó)《混凝土結(jié)構(gòu)建筑規(guī)范》（ACI318M05）中壓桿-拉桿模型設(shè)計(jì)的相關(guān)規(guī)定，試驗(yàn)參數(shù)為剪跨比、配筋方式等。試驗(yàn)結(jié)果表明，深梁混凝土抗壓強(qiáng)度軟化系數(shù)β與剪跨比和分布鋼筋配筋率有關(guān)；水平分布筋對(duì)于承載力的貢獻(xiàn)大于豎向分布鋼筋。根據(jù)試驗(yàn)結(jié)果比較，中國(guó)規(guī)范對(duì)于小剪跨比（λ≤1）深梁的設(shè)計(jì)有較大的安全儲(chǔ)備，美國(guó)規(guī)范深梁設(shè)計(jì)中所采用的壓桿-拉桿模型較為經(jīng)濟(jì)合理。

［關(guān)鍵詞］鋼筋混凝土簡(jiǎn)支深梁； 壓桿-拉桿模型； 模型試驗(yàn)； 極限承載力

中圖分類(lèi)號(hào)：TU398-7文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)01-0091-06

Experimental study on simply supported reinforced concrete deep beams of strut-and-tie models 

Qiu Yike, Liu Xia, Lin Yun(College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract:Strut-and-tie models are widely used in buildings for deep beams. In order to study strut-and-tie models, simply supported deep beams were tested under vertical symmetrical concentrated loads．The theoretical basis is Chinese Code for design of concrete structures(GB 50010—2010) and American code ACI318M-05．The main experimental parameters were beam span to depth ratio, steel reinforcement, and so on．The test results show that the compressive strength softening coefficient β of concrete deep beam was depended on shear span ratio and distributed steel, and horizontal steel has more role than vertical steel. Based on the tests and analysis, the comparison between the formulas given in code GB 50010—2010 and those of code ACI318M-05 as well as experiment data given by simulation analysis were presented. It is also found that λ≤1 in Chinese code is more safety, and strut-and-tie model in American code is more economic and rational.

Keywords:simply supported deep RC beams; Strut-and-Tie models; models tests; ultimate bearing capacity

*國(guó)家自然科學(xué)基金（50908082），湖南省科技廳項(xiàng)目（2009ZK3111）。

作者簡(jiǎn)介：仇一顆，副教授，博士研究生，Email：qiuyikebeite@yahoo.com.cn。

參考文獻(xiàn)

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