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(湖南大學(xué)土木工程學(xué)院建筑結(jié)構(gòu)實(shí)驗(yàn)室， 長(zhǎng)沙 410082)

摘要: 設(shè)計(jì)了 C35 和 C45 混凝土疊合梁各 4 根，其中預(yù)制部分采用含燒結(jié)磚骨料再生混凝土，后澆部分采用普通混凝土，預(yù)制部分含燒結(jié)磚再生骨料取代率分別為 0%、33. 3%、66. 7%和 100%，并進(jìn)行了預(yù)制再生混凝土疊合梁抗彎試驗(yàn)，以研究不同混凝土強(qiáng)度等級(jí)、再生骨料取代率對(duì)混凝土疊合梁抗彎性能的影響。 試驗(yàn)結(jié)果表明:預(yù)制部分再生骨料的取代率與梁的剛度并未有明顯關(guān)聯(lián)；預(yù)制部分再生骨料取代率并不會(huì)明顯改變混凝土梁的延性，極限狀態(tài)沒有明顯區(qū)別；預(yù)制再生混凝土疊合梁的抗彎承載力、剛度與規(guī)范值接近，實(shí)際工程中可以在混凝土疊合梁的預(yù)制部分采用較高取代率的再生混凝土；在適用性方面，預(yù)制部分再生骨料取代率的提高會(huì)加劇裂縫寬度的發(fā)展。

關(guān)鍵詞: 含燒結(jié)磚骨料； 再生混凝土； 疊合梁； 抗彎性能； 取代率

中圖分類號(hào):TU375. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002￣848X(2022)02￣0110￣05

DOI:10. 19701 / j.jzjg.20200054

Experimental study on flexural behavior of concrete composite beams in precast part with recycled fired brick aggregates

DONG Shang， HUANG Liang， TU Wenge

(Building Structure Laboratory， College of Civil Engineering， Hunan University， Changsha 410082， China)

Abstract: Four C35 and four C45 concrete composite beams were designed respecitively， in which the precast part usesrecycled aggregates with fired brick and the cast￣in￣place part uses conventional concrete. The replacement rates of recycledaggregates with fired brick in precast part are 0%， 33. 3%， 66. 7% and 100%， respectively. The concrete composite beamsin precast part with recycled aggregates have been subjected to flexural tests to study the effect of flexural performance ofconcrete composite beams in different concrete strength grades and the replacement rate of recycled aggregates. The testresults show that there is no obvious correlation between the replacement rate of recycled aggregates in precast part and thestiffness of concrete beams. The replacement rate of recycled aggregates in precast part does not distinctly change theductility of concrete beam， and ultimate failure does not change significantly. The flexural bearing capacity and stiffness ofconcrete composite beams in precast part with recycled aggregates are close to the standard values. It is possible to userecycled concrete with higher replacement rate in the precast part of composite beams in engineering. In terms ofapplicability， the increase in the replacement rate of recycled aggregates in precast part will aggravate the development ofcracks width.

Keywords: aggregates with fired brick； recycled concrete； composite beam； flexural performance； replacement ratio

∗“十三五”國(guó)家重點(diǎn)研發(fā)計(jì)劃(2017YFD1703300)。

第一作者:董商，碩士，主要從事裝配式結(jié)構(gòu)的研究，Email:adamjonison@ hnu.edu.cn。

[引用本文] 董商，黃靚，涂文戈. 含燒結(jié)磚骨料預(yù)制再生混凝土疊合梁抗彎性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu)，2022，52(2): 110￣114， 78. DONG Shang， HUANG Liang， TU Wenge. Experimental study on flexural behavior of concretecomposite beams in precast part with recycled fired brick aggregates[J]. Building Structure，2022，52(2):110￣114，78.