CAJ | 학술논문

针对工程实践中出现的斜拉索应力松弛现象，结合主跨240 m的双塔双索面斜拉桥———南京青奥景观桥工程实例，分析斜拉索应力松弛行为对结构的影响。采用M IDAS软件建立南京青奥景观桥整体模型，分别用影响矩阵法和等效温度法模拟分析斜拉索应力松弛行为，并比较二者的差异；最后采用等效温度法计算南京青奥桥斜拉索松弛对结构的影响。结果表明：斜拉索的松弛行为可采用影响矩阵法和等效温度法进行模拟，2种方法均有足够的模拟精度，等效温度法更为直接方便；斜拉索松弛对桥塔内力和位移以及主梁轴力影响较小，对主梁局部区域弯矩和位移影响相对较大。
침대공정실천중출현적사랍색응력송이현상，결합주과240 m적쌍탑쌍색면사랍교———남경청오경관교공정실례，분석사랍색응력송이행위대결구적영향。채용M IDAS연건건립남경청오경관교정체모형，분별용영향구진법화등효온도법모의분석사랍색응력송이행위，병비교이자적차이；최후채용등효온도법계산남경청오교사랍색송이대결구적영향。결과표명：사랍색적송이행위가채용영향구진법화등효온도법진행모의，2충방법균유족구적모의정도，등효온도법경위직접방편；사랍색송이대교탑내력화위이이급주량축력영향교소，대주량국부구역만구화위이영향상대교대。
T he relaxation of prestressing strands is a phenomenon existing in actual engineer‐ing projects .The Youth Olympic Landscape Bridge ,a two‐pylon cable‐stayed bridge with a main span of 240 m and with double cable planes ,was cited as an engineering example ,to study the in‐fluence of relaxation of prestressing strands on the structure .MIDAS was used to establish the o‐verall model of the Youth Olympic Landscape Bridge in Nanjing ,using influential matrix method and equivalent temperature method to simulate the relaxation behavior of prestressing strands and the results gained from these two methods were compared .At last ,the equivalent temperature method w as used to calculate the relaxation of prestressing strands on the structure of the Youth Olympic Landscape Bridge in Nanjing .Results of the study indicate that the relaxation behavior of prestressing strands can be simulated by the influential matrix method and equivalent temperature method ,both of the two methods have sufficient simulation accuracy ,and the equivalent tempera‐ture method is much more direct and convenient .The relaxation of stay cables have minimal influ‐ence on the internal force and displacement of pylons as well as the main girder axial force ,but have greater influence on the local bending moment and displacement of the main girder .