为了解预应力钢绞线张拉顺序对新老混凝土组合梁力学性能的影响，进行了双T形截面新老混凝土组合梁试验研究。
The old and new concrete of composite beam with double T-section was tested to investigate the effect of tension sequence of prestressing tendon on mechanical behavior of composite beam.
钢绞线下料时，留足端部张拉位置所必须的长度。
The preparation materials of steel strands, the enough length by end part tensioning position shall be required.
预应力张拉施工中夹片、钢绞线和锚环之间存在着很大的摩擦阻力。
There is much prestressing loss for friction resistance among wedge, steel strand and anchor-ring in engineering.
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