寒区高强钢丝索体内外温度相关性的研究

Study on the correlation between internal and external temperature of high-strength steel wire rope in cold regions

为解决高寒地区高强钢丝索体内部温度测试问题,选取三跨系杆拱桥中吊杆进行温度测试。基于现场实测数据,采用相关性理论确定吊杆内外温度间的关系,建立“吊杆钢丝温度-防护罩表面温度-有效距离”的回归模型,从而实现间接测试吊杆内部钢丝温度,得出以下结论:吊杆横断面径向温度呈非线性分布,且吊杆横断面各测点温度及温度梯度均表现出随时间呈周期为24h的波浪状曲线变化。建立了吊杆内外温度与有效距离的关系函数。吊杆横断面中心与R/2处钢丝预估与实测最大温差分别为0.6℃和0.7℃,说明该函数可有效解决吊杆内部温度的测试问题,为后续吊杆索力中温度的测试及修正提供参考和解决办法。

In order to solve the internal temperature test problem of high strength steel wire cable body in alpine region,the suspender in three span tied arch bridge is selected for temperature test.Based on the field measured data,the relationship between the internal and external temperature of the suspender is determined by using the relevant theory,and the regression model of’suspender steel wire temperature-shield surface temperature-effective distance’is established,so as to realize the indirect test of the internal steel wire temperature of the suspender.The following conclusions are drawn:the radial temperature of the suspender cross-section is nonlinearly distributed,and the temperature and temperature gradient of each measuring point of the suspender cross-section change in a wavy curve with a period of 24 h.The function between the temperature inside and outside the boom and the effective distance is established.The maximum temperature difference between the predicted value and the measured value of the cross section center position and the R/2 position of the suspender steel wire is 0.6℃and 0.7℃,respectively,indicating that the function can effectively solve the test problem of the internal temperature of the suspender,and provide reference for the temperature test and correction of the subsequent suspender cable force.