本文選題：再生混凝土　切入點(diǎn)：內(nèi)貼片　出處：《中南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年06期 　論文類型：期刊論文

【摘要】：通過改變箍筋間距,采用鋼筋開槽內(nèi)貼片方法,測(cè)試全天然骨料和全再生骨料共6組鋼筋混凝土構(gòu)件的平均黏結(jié)-滑移曲線及錨固段內(nèi)不同位置處的鋼筋應(yīng)變。基于試驗(yàn)結(jié)果,計(jì)算不同錨固位置處鋼筋與混凝土的黏結(jié)應(yīng)力和相對(duì)滑移,得到相應(yīng)位置的黏結(jié)-滑移曲線。分析箍筋約束對(duì)再生混凝土-鋼筋黏結(jié)應(yīng)力分布的影響機(jī)理,并建立再生混凝土與鋼筋間黏結(jié)應(yīng)力分布函數(shù)模型。研究結(jié)果表明:未配箍構(gòu)件的加載端黏結(jié)應(yīng)力大于自由端黏結(jié)應(yīng)力;構(gòu)件配箍筋后,平均極限黏結(jié)強(qiáng)度提高,峰值滑移顯著增加,平均黏結(jié)-滑移曲線下降段變平緩,且隨著箍筋間距減小,錨固段黏結(jié)應(yīng)力分布逐漸均勻;再生粗骨料對(duì)鋼筋混凝土的黏結(jié)應(yīng)力分布影響較小。
[Abstract]:By changing the space of stirrups and using the method of slotted internal patch of steel bar, the average cement-slip curve and the strain of steel bar at different positions in the Anchorage section of 6 groups of reinforced concrete members were measured by natural aggregate and whole recycled aggregate. The bond stress and relative slip of steel bar and concrete at different anchoring positions are calculated, and the corresponding cement-slip curves are obtained. The mechanism of the influence of stirrups on the stress distribution of recycled concrete reinforced bar is analyzed. The model of bond stress distribution between recycled concrete and steel bar is established. The results show that the bond stress at the loading end is greater than the bond stress at the free end, and the average ultimate bonding strength increases after the stirrups are fitted. The peak slip increases significantly and the average cement-slip curve decreases, and with the decrease of stirrups spacing, the stress distribution of the anchoring section becomes more and more uniform, while the recycled coarse aggregate has little effect on the stress distribution of reinforced concrete.
【作者單位】： 廣西大學(xué)土木建筑工程學(xué)院;廣西大學(xué)廣西防災(zāi)減災(zāi)與工程安全重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51308135) 廣西自然科學(xué)基金資助項(xiàng)目(2014GXNSFBA118242) 廣西防災(zāi)減災(zāi)重點(diǎn)實(shí)驗(yàn)室系統(tǒng)性研究課題(2013ZDX01)~~
【分類號(hào)】：TU528

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