本文選題：再生混凝土　切入點：內貼片　出處：《中南大學學報(自然科學版)》2017年06期 　論文類型：期刊論文

【摘要】：通過改變箍筋間距,采用鋼筋開槽內貼片方法,測試全天然骨料和全再生骨料共6組鋼筋混凝土構件的平均黏結-滑移曲線及錨固段內不同位置處的鋼筋應變。基于試驗結果,計算不同錨固位置處鋼筋與混凝土的黏結應力和相對滑移,得到相應位置的黏結-滑移曲線。分析箍筋約束對再生混凝土-鋼筋黏結應力分布的影響機理,并建立再生混凝土與鋼筋間黏結應力分布函數(shù)模型。研究結果表明:未配箍構件的加載端黏結應力大于自由端黏結應力;構件配箍筋后,平均極限黏結強度提高,峰值滑移顯著增加,平均黏結-滑移曲線下降段變平緩,且隨著箍筋間距減小,錨固段黏結應力分布逐漸均勻;再生粗骨料對鋼筋混凝土的黏結應力分布影響較小。
[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】： 廣西大學土木建筑工程學院;廣西大學廣西防災減災與工程安全重點實驗室;
【基金】：國家自然科學基金資助項目(51308135) 廣西自然科學基金資助項目(2014GXNSFBA118242) 廣西防災減災重點實驗室系統(tǒng)性研究課題(2013ZDX01)~~
【分類號】：TU528

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本文編號：1588256