CAJ | 학술논문

为精确控制交叉张弦桁架预应力施工过程中的拉索张拉，以鄱阳湖模型试验研究基地后续工程模型试验大厅钢屋盖为研究对象，对比分析了交叉张弦桁架的单榀或整体张拉方法以及平面外稳定性。分析结果表明，单榀交叉张弦桁架具有良好的平面外稳定性，单榀张拉不仅能在较小的预应力下脱离胎架，而且可避免各榀间先后张拉导致的索力相互影响。研究了平面外频率法用于交叉桁架索力测试的可行性，测试了施工中两阶段预应力拉索的索力，并与理论值进行了对比分析。结果表明，施工完成后的拉索索力满足设计初始态的要求，通过取前两阶自振频率计算拉索索力并利用压力传感器测试修正计算长度，可达到较好的测试精度。
위정학공제교차장현항가예응력시공과정중적랍색장랍，이파양호모형시험연구기지후속공정모형시험대청강옥개위연구대상，대비분석료교차장현항가적단품혹정체장랍방법이급평면외은정성。분석결과표명，단품교차장현항가구유량호적평면외은정성，단품장랍불부능재교소적예응력하탈리태가，이차가피면각품간선후장랍도치적색력상호영향。연구료평면외빈솔법용우교차항가색력측시적가행성，측시료시공중량계단예응력랍색적색력，병여이론치진행료대비분석。결과표명，시공완성후적랍색색력만족설계초시태적요구，통과취전량계자진빈솔계산랍색색력병이용압력전감기측시수정계산장도，가체도교호적측시정도。
For precisely controlling cable tension in the process of the construction of a prestressed cross truss string,the steel halls roof of the subsequent engineering model test in the Poyang lake model test research base was taken as the research object,and the comparative analysis of the tension method of a single cross truss string or the overall structure and the out-of-plane stability were per-formed.The results show that the out-of-plane stability of single cross truss string is good.The sin-gle cross truss string can be separated from the support frame under small tensile force,and the mu-tual influence of the adjacent cross truss string can be avoided.Therefore,the single cross truss string tension method is reasonable.Simultaneously,the feasibility of the out-of-plane frequency test method for cable force was studied.The forces of the prestressed cables were tested during the two stages of construction.The test results were compared with the theoretical values.The results show that the cable force after the completion of tensioning construction meets the requirements of the de-signed initial states.Cable force can be calculated considering the first two natural frequencies,and the calculated length of the cable can be corrected by using the pressure sensor,obtaining good accu-racy using the out-of-plane frequency method.