体外预应力RPC箱梁受弯加载试验研究
发布时间：2018-10-19 11:12
【摘要】：进行体外预应力RPC箱梁模型两点对称受弯加载试验,研究了荷载-挠度曲线、截面应变、裂缝分布和破坏模式等问题,并对模型梁跨中正截面抗弯承载力进行了计算分析.结果表明,模型梁属于整体受弯破坏,采用预制节段拼装的施工方法是可行的;模型梁中混凝土对开裂弯矩的贡献明显大于同类普通混凝土梁,开裂时跨中受拉区边缘RPC应变约为普通混凝土的4~6倍;采用体外预应力提高了模型梁的开裂弯矩和增加了其延性,模型梁开裂弯矩为极限弯矩的55%;开裂时梁的跨中挠度仅为跨中极限挠度的20%;体外预应力RPC箱梁进行正截面承载力计算时应考虑RPC的受拉作用,并且可参照本文算法进行设计计算.
[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.
【作者单位】： 福州大学土木工程学院;武汉理工大学材料科学与工程学院;
【基金】：福建省发展与改革委员会科研资助项目(闽发改[2010]299号)
【分类号】：U446
，
本文编号：2280952
[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.
【作者单位】： 福州大学土木工程学院;武汉理工大学材料科学与工程学院;
【基金】：福建省发展与改革委员会科研资助项目(闽发改[2010]299号)
【分类号】：U446
，
本文编号：2280952
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2280952.html
