研究目的:探讨顶应力钢绞线量测方法，总结预应力钢铰线张拉伸长值计算、锚塞回缩量的量测及其对 张拉力的影响，为预应力工程钢绞线张拉量测提供成熟有效的方法。
研究结论:(1)采用该方法施工的桥梁钢绞线预应力张拉伸长值、锚塞回缩量量测，均符合预应力筋的加 工及张拉的各项指标要求;(2)张拉完成时的上拱度量测结果均与设计计算结果相符，符合设计要求，与张拉 力控制匹配良好，可用于钢绞线预应力张拉施工工艺的计算、量测;(3)当钢绞线分多次实施张拉时，将各次 张拉伸长量累加，伸长量计算时，应在按各次张拉伸长量累加(初始拉力的伸长值是按规范规定推算而得)而 得的实测伸长值中，减掉所有各级的在张拉千斤顶中工作长度的伸长值。
Research purposes: The discussion is made on the measurement method of prestressed steel strand and the summaries are made on calculation of tensile value of prestressed steel strand, the measurement of anchorage rebound volume and its influence on the tensile value for the purpose of providing an effective and mature method of measuring tensile value of prestressed steel strand.
Research conclusions : (1)The tensile value and measured anchorage rebound volume made from the method presented in this paper satisfy the requirements of stressed steel bar for manufacture and tension. ( 2 ) When the tension comes to the end, the measured outcome of top anchor degree conforms to that of design, so this method can be used for calculation and measurement of prestressed tensile of steel strand.(3)When the steel strand is tensioned for several times, the tensile volume of each time should be accumulated and when calculation of the tensile volume, the working length of the jack should be subtracted.
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