如何可靠地确定预应力冷拉钢筋的千斤顶油表读数,使每种钢筋的性能得到充分利用,这是预应力加工中很关心的问题。而按现有的介绍在压力机上反复校核或由千斤顶活塞面积计算决定千斤顶油表读数,误差往往相差10～15％左右。原因是在实际中往往不能估计到机具与千斤顶之间产生的各种阻力,使钢材的应力得不到充分地利用。我们采用一种 How to reliably determine the jack oil meter reading of the prestressed cold-drawn steel bars to make full use of the performance of each type of steel bar is a matter of great concern in pre-stressed machining. According to the existing introduction of repeated checking on the press or the jack piston area calculation to determine the jack oil meter reading, the error often varies by about 10 to 15%. The reason is that in practice, various resistances between the implement and the jack are often not estimated, and the stress of the steel is not fully utilized. We use a