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按一定的缩放比例浇筑水泥混凝土道面板结构模型,接缝处设有传力杆且具有不同松动长度。通过不同加载等级进行相关数据测定,研究不同松动长度下道面板的位移传荷系数及传力杆和接缝界面混凝土的力学特征,得出荷载较小时,接缝传荷系数变化不明显,当达到1~3 k N时,传荷系数明显增大,超过5 k N后,传荷系数相对平稳;传力杆松动长度在0~10 cm时,接缝的传荷系数及杆与混凝土界面的混凝土应变随松动长度的增大逐渐减小,传力杆上的剪切应变先增大后减小,当松动长度超过10 cm后,各指标变化不再明显。
According to a certain scale pouring cement concrete pavement structure model, the seams are equipped with dowel bars and have different loose length. Through the analysis of the relevant data at different loading levels, the displacement transfer coefficient and the mechanical characteristics of dowel bar and concrete at the joint interface were studied. The results showed that when the load was small, the joint load transfer coefficient did not change obviously When 1 ~ 3 kN, the load transfer coefficient increases obviously, and the load transfer coefficient is relatively stable when it exceeds 5 kN. The load transfer coefficient of the joint and the interface between the rod and the concrete The concrete strain decreases with the increase of the loose length, the shear strain on the dowel bar first increases and then decreases, and when the loosening length exceeds 10 cm, the change of each index is no longer obvious.