Temperature Field Model Of Corrugated Steel Web Continuous Rigid Frame Bridge In High Temperature Area Of Dry-Hot Valley

In the process of bridge construction monitoring,it is necessary to provide accurate monitoring instructions to help the construction side set the elevation of the vertical formwork accurately,and the linear time of the bridge structure in the construction process is affected by the temperature change of the construction site.In the process of construction monitoring,the daily temperature stable period is usually chosen to measure the alignment of the bridge structure,and this is used as the basis for providing the elevation of the vertical die.However,the actual construction time of the bridge can not be synchronized with the observation time of the vertical formwork elevation.Therefore,it is necessary to make the necessary correction according to the actual temperature of the construction site.The temperature field model of the construction area is the basis for the temperature difference correction of the elevation of the model.Whether the temperature field model is accurate or not is directly related to whether the correction of vertical die elevation is reasonable.In addition to the temperature field model,the accuracy of bridge vertical die elevation is also related to the calculation model correction,bridge construction process load calculation and other factors.However,this paper only studies the temperature field model of continuous rigid frame bridge with corrugated steel web.Other factors have been accurately considered in the follow-up work,which is helpful to focus the research on the temperature field model of bridge construction.The temperature field model of the construction area is specially studied for the continuous rigid frame bridge with corrugated steel web.The bridge is located in the typical dry and hot valley area,because the temperature changes sharply and the wind speed is large.The bridge alignment changes greatly during construction.The change of ambient temperature will have a great influence on the internal force and alignment of bridge structure.In order to accurately calculate the intermediate ideal state during bridge construction,it is necessary to set the temperature field of the corresponding construction section accurately.According to the finite difference model proposed by the Potgieter and Gamble,the sensitivity analysis is carried out.According to the environmental climate conditions,solar radiation,daily ambient temperature change and wind speed of the bridge,the positive temperature gradient prediction formula of the corrugated steel web continuous rigid frame bridge is obtained,and the temperature field model of the construction area suitable for the high temperature area of the dry-hot valley is modified.In this paper,based on a bridge under construction,the temperature field and alignment of the bridge are observed for a long time in the process of construction monitoring,and the field measured data are obtained.The construction section of the corrugated steel web continuous rigid frame bridge is simulated and the theoretical value of vertical formwork elevation is obtained.The temperature field model proposed by the Potgieter and Gamble and the measured data are combined to obtain the temperature field model in the construction area of the bridge.The maximum temperature difference is 3℃ and the maximum deflection error is 1.07 mm,which has reached the expected ideal state.The simulation and the measured results show that the temperature field model of the construction area is reliable,and it is mainly suitable for the study of the temperature field model of the corrugated steel web continuous rigid frame bridge in the high temperature area of the dry and hot valley.