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顶推法施工的预应力混凝土连续梁,不论是现浇拼接还是预制拼接,都要逐段拼接逐段顶推。拼接方法可分为非直线拼接(见图1)与直线拼接(见图8)。非直线拼接时,梁轴在无荷载状态下不是一根直线,并由此产生随顶推进程而变化的支点强迫变形及相应内力,河南省“公路测设资料”1980年第一期曾对此作过探讨。我们权且将顶推中某一支承状态实际产生的内力,与同一支承状态下无载梁轴为一根直线时的计算内力之差,称为拼接次内力。它仅仅是由分段拼接产生的,而不涉及其他次内力。
Pushing the construction of prestressed concrete continuous beams, either in-situ splicing or prefabricated splicing, should be piece by piece splicing section by section push. Splicing methods can be divided into non-linear splicing (see Figure 1) and straight splicing (see Figure 8). Non-linear splicing, the beam axis is not a straight line under no-load conditions, and thus with the jacking process changes in the fulcrum force deformation and the corresponding internal forces, Henan Province, “Highway measuring data” in 1980 first had This has been discussed. We right and will thrust in a bearing state of the actual internal forces, and the same support state no-load beam axis as a straight line when calculating the difference between the internal force, called splicing secondary forces. It is only produced by piecewise splicing without involving other sub-internal forces.