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大跨度悬索桥对温度场十分敏感,在主缆索股架设过程中这现象表现得尤为突出,通过对悬索桥结构温度时变效应计算理论的研究,给出了温度场布设方案及测试方法。以湖北某大跨度悬索桥为工程背景,对施工期间该桥的温度场进行了实时观测,得出了该悬索桥主塔及主缆的温度场。借助大型有限元计算程序ANSYS,通过对实测数据与理论计算结果的对比分析,验证了提出的温度场布设方案及测试方法的可行性。通过对不同温度场下的结构线形进行实时分析,得出了索塔及主缆索股在不同温度场下的线形及相应的变化规律,据此确定了的最佳调索时机,同时将分析所得的结果直接指导工程实践。结果表明:该方案及方法实用性强、精度高,具有较强的推广应用价值。
The long-span suspension bridge is very sensitive to the temperature field. This phenomenon is particularly prominent in the process of erection of the main cable strand. The temperature field distribution scheme and test method are given through the study of the calculation theory of the time-varying effect of the suspension bridge structure temperature. Taking a large-span suspension bridge in Hubei as the engineering background, the temperature field of the bridge during construction was observed in real time, and the temperature field of the main tower and main cable of the suspension bridge was obtained. With the help of the large-scale finite element program ANSYS, the comparison between the measured data and the theoretical calculation results shows that the proposed temperature field layout scheme and the feasibility of the test method are validated. Through the real-time analysis of the structural linearity under different temperature field, the linear and corresponding variation rules of pylon and main cable strand under different temperature fields are obtained, and the optimal timing of the retrieval is determined. At the same time, The results directly guide the engineering practice. The results show that the scheme and method are practical, high precision and have strong promotion and application value.