【摘要】：進(jìn)行體外預(yù)應(yīng)力RPC箱梁模型兩點(diǎn)對(duì)稱受彎加載試驗(yàn),研究了荷載-撓度曲線、截面應(yīng)變、裂縫分布和破壞模式等問(wèn)題,并對(duì)模型梁跨中正截面抗彎承載力進(jìn)行了計(jì)算分析.結(jié)果表明,模型梁屬于整體受彎破壞,采用預(yù)制節(jié)段拼裝的施工方法是可行的;模型梁中混凝土對(duì)開(kāi)裂彎矩的貢獻(xiàn)明顯大于同類普通混凝土梁,開(kāi)裂時(shí)跨中受拉區(qū)邊緣RPC應(yīng)變約為普通混凝土的4~6倍;采用體外預(yù)應(yīng)力提高了模型梁的開(kāi)裂彎矩和增加了其延性,模型梁開(kāi)裂彎矩為極限彎矩的55%;開(kāi)裂時(shí)梁的跨中撓度僅為跨中極限撓度的20%;體外預(yù)應(yīng)力RPC箱梁進(jìn)行正截面承載力計(jì)算時(shí)應(yīng)考慮RPC的受拉作用,并且可參照本文算法進(jìn)行設(shè)計(jì)計(jì)算.
[Abstract]:In this paper, the load-deflection curve, cross-section strain, crack distribution and failure mode of external prestressed RPC box girder model under two-point symmetrical flexural loading are studied, and the flexural bearing capacity of normal section of model beam is calculated and analyzed. The results show that the model beam belongs to the whole bending failure, and it is feasible to adopt the construction method of precast segmental assembly, and the contribution of concrete in the model beam to the cracking moment is obviously greater than that of the same kind of ordinary concrete beam. The strain of RPC at the edge of the middle tension zone is about 4 ~ 6 times of that of ordinary concrete, and the crack moment and ductility of the model beam are improved by external prestressing. The cracking moment of the model beam is 55% of the ultimate moment; the mid-span deflection of the beam is only 20% of the mid-span deflection; the tensile action of RPC should be taken into account in the calculation of the normal section bearing capacity of the externally prestressed RPC box girder. And can refer to this algorithm design calculation.
【作者單位】： 福州大學(xué)土木工程學(xué)院;武漢理工大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：福建省發(fā)展與改革委員會(huì)科研資助項(xiàng)目(閩發(fā)改[2010]299號(hào))
【分類號(hào)】：U446
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本文編號(hào)：2280952