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文章结合实际工程测定对称割线法对先张板有效预应力及预应力筋锚固效果的影响,采用电阻应变计实测出割线放张及千斤顶整体放张后板体中的有效预应力并进行比较,再与理论计算的结果进行比较分析,证实了对称割线放张法引起的预应力损失较小,对锚固区混凝土粘结力的破坏不明显而且放张过程中对板体的损害小,有效地解决了先张板在放张过程中产生过大位移的问题,避免了板体或底模的破坏,从而证实了这一新工艺的可行性。
In this paper, the effect of symmetric secant method on the effective pre-stress of pre-tensioned plate and anchorage effect of pre-stressing plate is determined by the actual engineering. The effective pre-stress in the plate body is measured and measured by resistance strain gauge The comparison and analysis with the results of theoretical calculation show that the loss of prestress caused by the symmetric secant is smaller and the damage to the concrete in the anchorage zone is not obvious and the damage to the plate during the releasing process is small , Which effectively solves the problem of excessive displacement of the pre-tensioning plate during the releasing process and avoids the damage of the plate or the bottom die, thereby confirming the feasibility of the new process.