Prediction of uniform temperature of rectangular hollow concrete pier based on measured temperature data

Abstract

The standard value of uniform temperature action for bridges is more loosely defined in local bridge design codes. Currently, there is an increasing tendency to determine the range of variation of uniform temperature of bridges based on air temperature information from various locations. In this study, in order to accurately and conveniently predict the range of temperature change of concrete during the design reference period. The temperature distribution of concrete rectangular hollow piers of Changjiahe Special Bridge was observed for 212 days. According to the observation data, the average temperature of the concrete hollow pier was studied as a function of the outside air temperature and the air temperature inside the hollow pier. The method of predicting the range of variation of the average concrete temperature according to the local air temperature material is proposed; the method of predicting the time-by-time uniform temperature of the concrete hollow pier based on the same temperature data inside and outside the hollow pier is proposed. The research results show that: the average temperature change rule of concrete hollow piers and air temperature, are presented day by day cycle and step change, and the hollow pier average temperature extremes appear time lagging behind the air temperature; day maximum, day minimum hollow pier average temperature and the average daily air temperature is linearly correlated between the average daily air temperature, the average daily air temperature, average daily air temperature inside the pier and the average daily hollow pier temperature is linearly correlated between the average daily air temperature and the average daily hollow pier temperature; the average temperature of the hollow pier The magnitude of change is less than the air temperature, hollow pier average temperature daily variation and air temperature daily difference is approximately linear; concrete hollow pier average temperature prediction and measured values, the maximum difference between − 1.1 ~ 0.8 ºC; in the design reference period, in the day of the highest, lowest daily average air temperature on the basis of an increase of 2 degrees Celsius, can be obtained from the range of uniform temperature changes in the bridge abutment.